IT Positions
Walsh Employment has over 50 years of combined experience serving the IT sector. Please find below a number of open positions that are currently live. If you would like more information on any of these roles then please do get in touch.
London – hybrid, office based 3 days per week
£140-185K base with £180-230K OTE plus excellent benefits
Our client is a global enterprise software company at the forefront of DevSecOps, Application Security, and software supply chain security. They are looking for a Security Solutions Architect to join their growing UK organisation in a highly strategic, customer-facing role. The focus is on helping large enterprise customers modernise their application security programmes, secure software delivery pipelines, and strengthen governance, risk, and compliance across complex software environments. This is an excellent opportunity for a senior security architecture specialist with a background across areas such as Application Security, DevSecOps platforms, cloud security, software supply chain security, developer platforms, security consulting, or enterprise software. The successful candidate will operate as a trusted advisor to both technical and executive stakeholders, bridging the gap between software development, security operations, governance, and enterprise risk management.
Fairfield County, CT - hybrid, office based 3 days per week
$190-220K plus bonus and excellent benefits package
Our client is seeking a Senior Java Developer to help design, develop and maintain a highly critical Web API platform supporting real-time services used across third-party integrations, client systems and client-facing applications. This is a senior backend development role within the Web API team, offering the opportunity to work on business-critical services that support day-to-day operations across a demanding, real-time technology environment.
Remote (USA)
$55-75K plus excellent benefits package
Our client is an award winning venture-backed Agri-Tech business using technology to improve livestock care and help farmers make better day-to-day decisions. With a collaborative, fast-growing team and a culture built around ownership, teamwork and real-world impact, they are continuing to invest in their data capability. We are now looking to appoint a Senior Data Engineer to help scale and mature their data warehouse and BI platform. This is a hands-on role focused on building reliable, well-modelled datasets that power reporting, analytics and downstream business tools across the organisation. Working across BigQuery, SQL, DBT, Python and Prefect, you will help improve the robustness, performance and scalability of the analytics environment while partnering closely with both technical and business stakeholders.
Remote (USA)
$185-245K plus equity and extensive benefits package
Our client builds core infrastructure for private capital markets through a cloud-based analytics and data management suite used by venture capital, private equity, and credit funds to make real investment decisions on real financial data. The Opportunity This is a high-ownership role in a small, product-led engineering team where you will lead delivery end-to-end and your architectural decisions directly shape the platform. The business is well established, well backed, and is growing through expansion meaning new workflows, new data models, and net-new product surface area. This is a true 50/50 full stack position: you will design schemas, build APIs, and ship UI across TypeScript, Node.js, PostgreSQL, GraphQL, React, and React Query. ________________________________________ Key Requirements Must-have skills and experience •9+ years professional software engineering experience, including leading complex technical projects •Strong expertise in TypeScript, Node.js, PostgreSQL, and GraphQL (especially schema and API design) •Strong frontend capability using React and React Query •Proven ability to navigate ambiguity and design solutions across data models, validation, application logic, and user workflows •Excellent leadership and communication skills – able to drive alignment and explain complex technical concepts clearly •Evidence of balancing technical quality with business outcomes, making smart trade-offs for delivery and long-term health •Strong software engineering fundamentals across hands-on coding and system design Nice to have •Experience with libraries such as SpreadJS, HyperFormula, FinnFlo.js, and AG Grid •Background in computation-heavy services where accuracy and performance are critical •Experience evolving complex data models to support new product use cases •Interest in tools that improve developer velocity, including AI-assisted coding ________________________________________ Role and Responsibilities As Technical Lead, you will: •Lead projects from ideation to production, owning technical decisions, architecture, data structures, and delivery approach •Partner with Engineering, Product, and Design to build high-performance, user-centric features with direct client impact •Champion platform reliability and data integrity while maintaining development velocity •Mentor engineers across levels and help grow future technical leaders (with scope to move into people management) •Promote best practices and continuous improvement across tooling, patterns, and engineering quality ________________________________________ Benefits Benefits include a competitive salary, equity participation, flexible working (remote, hybrid, in-person options), 401(k), unlimited and flexible vacation, generous health benefits, company-wide team events, fully paid parental leave, and more. ________________________________________ Diversity and Inclusion Our client is committed to promoting a diverse and inclusive culture and welcomes applicants from all backgrounds. If you enjoy working collaboratively and want to make an outsized impact in a high-growth environment, they would love to hear from you.
San Fransico, CA
$250–350K with extensive benefits package
Our client is a multi-strategy hedge fund investment firm, employing both fundamental and quantitative strategies across multiple sectors. They are hiring a Full Stack Engineer to build custom internal web applications that solve specific business problems for stakeholders across the firm. ________________________________________ Key Requirements We are looking for a high-calibre engineer who enjoys delivering end-to-end solutions and can move confidently across frontend, backend, and infrastructure. Essential experience and attributes •5+ years commercial full-stack experience building and shipping web applications •Strong hands-on React, TypeScript, and Python •Strong understanding of RESTful API design and integration patterns •Practical experience with cloud infrastructure: AWS, GCP, or Azure •Strong fundamentals in data modelling and designing for maintainability •Comfortable switching between frontend and backend tasks day-to-day •Proven ability to deliver production software (discovery to deployment to iteration) •Confident communicator who can engage a range of stakeholders and translate needs into clear engineering outcomes •Strong product mindset: focused on business value, usability, speed, and clarity Candidate profile (important) •Background from good companies and ideally good schools •Stable career history – preference for candidates with non-choppy tenure and clear progression •Evidence of ownership: takes accountability for outcomes, quality, and follow-through ________________________________________ Role and Responsibilities What you’ll do •Build custom internal web applications end-to-end, leveraging an internal component library to solve specific user problems •Take ownership of features from concept to deployment and maintenance •Run stakeholder discovery to understand business needs and define the right solution, owning the lifecycle from discovery to delivery, including: oProblem discovery and defining what the solution should look like oCreating a clear engineering design and approach oImplementing the solution once reviewed oDeployment, iteration, and long-term maintenance •Work across the stack to meet unique user needs oSpin up new services where required oUse the internal component library to present information clearly and effectively •Make pragmatic technical decisions optimised for speed, clarity, and user impact •Iterate quickly based on feedback rather than over-engineering generalised abstractions •Build highly usable applications with a strong focus on UX, reliability, and stakeholder outcomes ________________________________________ Technology Focus •Frontend: React, TypeScript, internal component libraries •Backend: Python, RESTful services •Cloud: AWS / GCP / Azure •Data: strong data modelling principles (tooling depends on team) ________________________________________ Why this role •High ownership, high impact engineering building tools that directly influence how the firm operates •A pragmatic environment that values shipping, iteration, and measurable user outcomes •Strong compensation aligned to top-tier engineering talent
Remote (UK-based) – with travel to customer sites
£90-120K plus bonus, car allowance & extensive benefits package.
Clearance Requirement: SC (Security Check) Our client is at the forefront of digital transformation, supporting the world’s most essential organisations through their most complex digital challenges. By providing visibility and insight at an unparalleled scale they help clients solve problems faster, secure what matters, and drive continuous innovation across their digital ecosystems. We are now seeking a Principal Sales Engineer to support the growth of UK public sector accounts. This is a remote, client-facing role for a highly technical and experienced presales professional with a strong Government/Public Sector background and current SC clearance. ________________________________________ Key Requirements We are looking for a client-facing technical expert with deep presales experience, capable of operating in complex and secure environments. Essential skills and experience: •15+ years’ experience in IT, with at least 10 years in presales, network engineering, or technical support (less experience required for the SC cleared role) •Demonstrable success supporting UK Government or public sector clients •Ability to translate technical challenges into clear commercial value •Strong expertise in: oCisco routing, switching, gateways, and applications oTCP/IP, SNMP, Netflow, VoIP oLAN/WAN topologies (MPLS, Frame Relay, ATM) oSecurity concepts and network infrastructure design oNetwork performance and fault/alert management •Solid understanding of: oOperating systems – Linux, Windows oCloud and virtualisation technologies – SDN/NFV, Public/Private Cloud oPerformance tools – HP/OV, Tivoli, EMC SMARTS, ArcSight •Relevant certifications – CCNA, CCNP, CCIE •Formal presales training (e.g. Sandler, Siebel, Afterburner) •Excellent communication and presentation skills – verbal, written, and visual •Comfortable with 60-70% UK travel Desirable qualifications: •Degree in Computer Science, Software Engineering, or equivalent technical military training •MBA or relevant business/leadership qualification •Knowledge of products such as Arbor, Radwhere, Riverbed, A10, ExtraHop •Experience authoring whitepapers, contributing to product strategy •Familiarity with security audits, RFP/RFI responses •Track record of mentoring technical presales teams •Exposure to security analytics tools and techniques, such as log analysis, anomaly detection, or traffic monitoring, with an interest in developing stronger skills. •Understanding of full packet capture and analysis concepts, or hands-on experience with tools like Wireshark, Zeek, or similar platforms. •Awareness of cybersecurity frameworks and best practices (e.g., NIST, ISO 27001) and how they apply to network assurance. ________________________________________ Role & Responsibilities As Principal Sales Engineer, you will play a vital role in driving revenue by delivering technical presales support, demonstrating product value, and shaping best-fit solutions. Reporting to the Regional Sales Director, you will act as a trusted advisor for public sector clients and internal stakeholders. Responsibilities include: •Leading technical discovery and supporting the full sales cycle •Creating and delivering high-impact demos and presentations •Differentiating solutions from competitors using compelling value stories •Acting as a technical expert across integrators, service providers, and Government •Partnering with product and engineering to influence roadmaps and relay market feedback •Contributing to technical documentation, RFPs, and whitepapers •Mentoring Sales Engineers, attending client meetings alongside them •Building strong customer relationships and identifying upsell opportunities •Representing customer needs internally and advocating for technical alignment •Participating in industry events, speaking engagements, and strategic initiatives ________________________________________ Additional Details Remote Working: •Officially home-based •Must be comfortable with regular travel for: oClient meetings 3-4 days per week oAnnual conference oQuarterly convention for Sales Engineers Location Preference: •Preference for candidates based in Central or Southern UK •Northern England considered for exceptional talent •Scotland is not preferred
Blackfriars, London – hybrid
£60-65K plus excellent benefits package
Our client is a UK-based, purpose-led organisation that partners with public, private and third sector bodies to design, test and scale practical innovations that improve outcomes for people and communities. They are now seeking an experienced Group Information Security Manager to join their IT team. This is an elevated Manager-level role, created to support the merger of two existing Information Security Management Systems into one coherent Group-wide framework. The Information Security strategy is already in place, so this role is focused on execution, delivery, stakeholder management and clear communication. It will suit a hands-on player-manager who can improve processes, embed controls, coordinate audit readiness and bring people with them across a complex, multi-entity environment.
Germany - Fully Remote
€155-165K with €200K OTE plus excellent benefits package
Our client is a global leader in software supply chain platforms, helping enterprise organisations build, secure, and deliver software at scale across DevOps, DevSecOps, and MLOps environments. Trusted by thousands of enterprises worldwide, the platform plays a critical role in accelerating innovation while ensuring security and compliance from code to production. This is a high-impact, customer-facing technical role, working with some of the world’s most sophisticated organisations. You will operate at the intersection of architecture, security, and business value, with strong visibility and genuine career progression.
Stamford, Connecticut – hybrid, 3 days office-based
US$160-210K base plus bonus and excellent benefits package
Our client is seeking talented Software Developers and Senior Software Developers to join a front-office trading technology team in Stamford, Connecticut. These are hands-on development roles suited to self-driven, self-managed software engineers with strong Python programming, FIX protocol, Linux and front-office trading systems experience. You will work directly with end users and technology colleagues to design, build, troubleshoot and enhance solutions supporting trading, market data, connectivity and automation across a fast-paced financial services environment. The role is hybrid, with 3 days per week in the Stamford office, including Monday as a mandatory office day. Local candidates are preferred, although relocation candidates and suitable commuters from NYC, Queens, western Long Island, Dutchess County and Northern New Jersey etc can also be considered where the commute is realistic.
Remote (USA)
$150-215K plus equity and extensive benefits package
Our client builds core infrastructure for private capital markets through a cloud-based analytics and data management suite used by venture capital, private equity, and credit funds to make real investment decisions on real financial data. The Opportunity You will join a highly driven product engineering team building software that supports critical financial workflows, deep data analysis, and an innovative data ingestion platform. This is a hands-on, high-impact role where you will take ownership of meaningful product areas, shipping end-to-end improvements across the stack in close partnership with Product and Design. You will be working in a collaborative environment that values practical engineering judgement, thoughtful trade-offs, and high-quality delivery. Even if you do not meet every criterion, we encourage you to apply – the team is supportive, ambitious, and invested in continuous learning and growth. ________________________________________ Key Requirements Must-have skills and experience •7+ years professional software engineering experience, delivering production systems at scale •Strong expertise in TypeScript, Node.js, PostgreSQL, and GraphQL •Proven capability in database schema design and writing performant SQL •Strong frontend experience using React and React Query •Excellent communication skills, with the ability to explain complex technical concepts to diverse audiences •Strong product mindset – able to bridge technical constraints and product needs, and deliver practical outcomes Nice to have •Experience with libraries such as SpreadJS, HyperFormula, FinnFlo.js, and AG Grid •Background in computation-heavy services where accuracy and performance are critical •Curiosity about tools that improve developer velocity, including AI-assisted coding ________________________________________ Role and Responsibilities As a Senior Software Engineer, you will: •Deliver features from concept to production, contributing to technical decisions, implementation approach, and maintainable design •Collaborate with Engineering, Product, and Design to build high-performance, user-centric functionality with direct client impact •Improve platform quality through pragmatic attention to reliability, data integrity, and engineering best practices •Lead and contribute to cross-team initiatives that enhance developer experience and operating processes •Mentor and support junior engineers, reinforcing a culture of continuous learning and improvement •Identify and adopt new technologies and patterns that help the team build better software, faster ________________________________________ Benefits Benefits include a competitive salary, equity participation, flexible working (remote, hybrid, in-person options), 401(k), unlimited and flexible vacation, generous health benefits, company-wide team events, fully paid parental leave, and more. ________________________________________ Diversity and Inclusion Our client is committed to promoting a diverse and inclusive culture and welcomes applicants from all backgrounds. If you enjoy working collaboratively and want to make an outsized impact in a high-growth environment, they would love to hear from you.
San Francisco, CA
$250–350K with extensive benefits package
Our client is a multi-strategy hedge fund investment firm, employing both fundamental and quantitative investment strategies across multiple sectors. They are hiring a Platform Full Stack Engineer to design and build scalable, reusable systems and user interfaces that power critical internal platforms across the firm. ________________________________________ Key Requirements We are seeking a technically strong, product-minded engineer with deep full-stack expertise and the ability to build robust, production-grade systems. Essential experience and attributes •5+ years commercial full-stack development experience, with a strong portfolio of production-grade applications •Advanced knowledge of Python, React, and TypeScript •Proven experience building UI components from scratch, not just leveraging third-party libraries •Deep understanding of modern software architecture principles •Strong knowledge of RESTful and/or gRPC API design •Experience designing and integrating clean, well-structured APIs in collaboration with backend and platform teams •Strong understanding of system performance, scalability, and reliability considerations •Ability to collaborate effectively across engineering and product teams •Passion for user experience, with strong attention to visual and interaction detail •Experience writing clean, well-tested, well-documented code following engineering best practice Candidate profile (important) •Background from strong academic institutions preferred •Experience at high-quality, well-regarded companies •Stable and consistent career history – preference for candidates with clear progression and minimal short tenures •Demonstrated ownership mindset and accountability for delivered outcomes ________________________________________ Role and Responsibilities What you’ll do •Design, build, and maintain scalable, reusable user interfaces using React and TypeScript, alongside robust backend services •Architect and implement performant, reliable, and maintainable systems across the entire stack •Partner closely with backend and platform engineers to design, influence, and integrate clean, well-structured APIs •Own features end-to-end – from technical design and implementation through deployment, monitoring, and long-term maintenance •Participate in solution design discussions, code reviews, and mentoring of junior engineers •Optimise application performance, reliability, and user experience across web and mobile environments •Contribute to platform-wide engineering standards and best practices ________________________________________ Technology Focus •Frontend: React, TypeScript •Backend: Python •APIs: REST and/or gRPC •Architecture: Modern distributed systems and scalable platform design ________________________________________ Why this role •High-impact engineering within a sophisticated investment environment •Opportunity to influence architecture and platform standards •Strong compensation aligned with top-tier engineering talent •Collaborative culture with high ownership and technical depth
London, San Francisco, California or New York City – onsite
£150-250K/$200-350K plus Equity & Benefits
Our client is a high-growth AI company offering a cloud-based SaaS platform that uses large language models (LLMs) to automate customer service across chat, email, and social channels. Their platform helps global enterprises replace traditional support teams with intelligent AI agents capable of handling sensitive, complex customer needs. ________________________________________ Key Requirements We are seeking top 1% engineering talent – highly analytical developers with strong educational and professional pedigrees. Essential: •Minimum 5 years’ experience as a professional software engineer working on production-grade systems with real-world users •Strong problem-solving and troubleshooting skills across complex tech stacks •Computer Science or Mathematics degree from a top-tier university •Clear, consistent work history – no more than one move every 2.5–3 years •Background at elite tech firms (e.g. Plaid, Moveworks, Roblox, MongoDB, Databricks, Two Sigma, Citadel, and any other firms similar, or quantitative finance competitors) •Curiosity and insight into how AI agents behave, learn, and fail – with a strong desire to improve their intelligence and reliability Nice-to-have: •Experience building voice interfaces or multimodal AI systems •Familiarity with enterprise customer experience platforms or conversational automation tools •Interest in developing visualisation and simulation tools to increase AI agent transparency ________________________________________ Role & Responsibilities As an AI Agent Software Engineer, you will design and build high-performance AI agents that deliver customer experiences more accurate, efficient, and satisfying than their human counterparts. You will work in a highly collaborative, engineer-led environment with full-cycle ownership – from idea to production deployment – and have a direct impact on how enterprise clients engage with their users. Your work will involve: •Designing and building AI agents that operate across chat and voice, executing complex tasks with precision •Translating natural language into structured, software-grade agent logic •Analysing agent performance at scale to uncover trends and opportunities for platform improvement •Experimenting with the latest language and voice model advancements, tuning them for reliability and performance •Using real-time observability tools (e.g. Trace View) to audit and improve agent decision-making with transparency You’ll collaborate with product managers, customer-facing teams, and fellow engineers to shape agent behaviour, improve outcomes, and solve real-world problems across sectors such as finance, healthcare, and travel. ________________________________________ Why This Role? This is not a legacy code maintenance role. It is a greenfield opportunity to redefine how millions interact with technology through AI. You’ll join a team that values: •Transparent, testable AI behaviour – no monolithic prompts, no guesswork •Modular, auditable agent logic – easy to version, debug, and improve •A fast feedback loop – engineers work closely with customer teams to rapidly prototype and deploy improvements You will help companies cut support costs, raise satisfaction scores, and scale customer support without growing headcount. ________________________________________ Perks & Benefits •Highly competitive salary + equity options •Comprehensive health benefits (medical, dental, vision) •Flexible PTO – take what you need •Lunch and snacks provided daily •Strong engineering culture focused on iteration, transparency, and technical excellence ________________________________________ What’s Ahead This is your chance to help shape the future of AI-human interaction – to build not just code, but intelligent systems that solve meaningful problems with clarity, speed, and empathy. If you are driven by engineering that delivers real-world impact – not vanity metrics – and thrive in environments where you own your work end-to-end, we want to hear from you.
New York City – Onsite
$400K – $1M+ total comp (Base + Bonus)
Our client is one of the world’s most successful alternative investment managers, renowned for its deep culture of collaboration, innovation, and continuous learning. Their business is powered by some of the most talented investment professionals, researchers, and engineers, working together to develop scalable systems and accelerate impactful ideas. With technology at the core, the engineering team builds the tools and platforms that empower quantitative research and enable commercial success. They value clarity, ownership, and execution – and are now looking for top-tier engineers to help shape the future of quantitative trading. ________________________________________ Key Requirements We are looking for experienced software engineers with exceptional Python skills, strong communication abilities, and a genuine interest in the world of quant finance. Finance experience is not required – we’re more interested in your ability to learn, collaborate, and write production-level code. You must have: •A Bachelor’s degree or higher in a technical field (e.g. Computer Science, Mathematics, Physics, Engineering) •A GPA above 3.0 – with a strong preference for 3.5+ •A degree from a top 25 university (preferred) •1+ years of hands-on software development experience •Advanced proficiency in Python •A track record of working in top-tier companies with no significant job-hopping •Excellent communication skills – clear, concise and collaborative •A genuine desire to work in quantitative finance •Full commitment to onsite work, 5 days a week in NYC ________________________________________ Role & Responsibilities You will work at the intersection of engineering and research, partnering with quantitative teams to build scalable systems and enhance productivity across the research pipeline. Your impact may include: •Building unified systems for data access, model development, backtesting and simulation •Collaborating with researchers and traders to identify pain points and deliver new functionality •Creating frameworks and APIs that support transparency and insight into investment strategies •Enabling collaboration through scalable environments and tooling that support research sharing •Owning end-to-end engineering processes, from design to deployment in a production trading environment This is a highly collaborative, high-impact role within a close-knit, world-class team. ________________________________________ If you're a strong Python developer with the drive to learn and the desire to apply your skills in a fast-paced, intellectually demanding environment – and you're ready to work onsite in New York – we’d love to hear from you.