Develop core eTrading MI & Analytics platform components using q and kdb+, with CI/CD, TDD/BDD, and an additional programming language. The platform captures, stores, and analyses over 3TB/5 billion daily records from electronic trading venues for risk, quant, trading, and sales stakeholders.

Develop low-latency server-side Java components for a global eTrading and eRisk platform serving FX and electronic execution. You’ll work with enterprise messaging (multicast, low-latency), FIX protocol, kdb+, and apply CI, TDD/BDD. The team builds distributed systems for pricing, order execution, and algorithmic trading.

Cboe Global Markets★3.7 (14)· London

You'll work primarily with Python to design and build highly reliable trading systems, working closely with advanced SQL, Linux, and optionally PostgreSQL, Snowflake, Apache Kafka, Apache Airflow, Django, Flask, or FastAPI. You'll expand data pipeline and event streaming functionality for Europe's largest equities exchange and related platforms, while leading complex projects, mentoring developers across multiple global teams, and participating in production support for Cboe Europe's trading operations.

MAREX★3.2 (6)· London

You will work with C# .NET, JavaScript, TypeScript, React, Node.js, GraphQL, Docker, NoSQL/RDMS databases, and AWS cloud services (ECS/EKS, Lambda, S3, RDS, API Gateway). The team builds and maintains applications to strengthen the company’s market-making capabilities and improve operational efficiency across multiple asset classes and geographies.

You'll work with Java 7/8+, Spring framework, Angular/React, REST, Hibernate, Docker, Terraform, GitHub, Jenkins, and cloud platforms (Azure/AWS). Solirius Reply is a technical consultancy that embeds consultants with clients across public and private sectors to deliver application delivery and solve real-world technical problems, with exposure to diverse projects.

This role involves Django, NHS Front End Toolkit, GDS, CI/CD, IaC, TDD/BDD, and pair/mob programming. You will work in multi-disciplinary, user-centred design teams delivering accessible front-end applications for the UK public sector, with experience in AI-augmented front-end, Python, API integration, and legacy system modernisation valued.

You will work with Python, Django, AWS, CI/CD, and IaC for accessible front-end development (WCAG, NHS Front End Toolkit) in a server-side rendered Django stack. The team delivers safe, secure solutions for the UK public sector within an Agile, user-centred design environment, using TDD, BDD, and pair/mob programming.

You will use server-side Java, enterprise messaging (multicast, low-latency), FIX, and kdb+ to build low-latency components for an electronic trading and risk platform. The team develops high‑performance distributed systems that manage liquidity, generate real‑time prices, handle order execution, and support algorithmic trading across global FX and electronic execution.

John Lewis & Partners★3.8 (3k)· London

You will work across the entire project lifecycle using Agile, Waterfall, or hybrid methodologies. This role is embedded within a product team at John Lewis & Partners, delivering complex technology projects spanning multiple business and technology teams. You will be an individual contributor within a specific workstream/team and may become a people manager for fellow analysts and engineers.

You will work with Java 11+, Spring/Spring Boot, Microservices, TDD/BDD (JUnit, Spock, Mockito), Git, Maven, and CI/CD on a cloud platform (AWS, Azure, or GCP). The role involves building and evolving a post-trade technology platform — including in-house systems, APIs, and client portal — for a specialist post-trade clearing and prime brokerage firm. You will also manage and mentor a small team of Java developers.

Build and maintain server-side rendered front-ends using Django, Python, and AWS, integrating APIs and applying TDD, BDD, and CI/CD with Infrastructure as Code. Work in a multi-disciplinary, user-centred team on UK public sector and healthcare projects, leveraging the NHS Front End Toolkit and GDS standards.

You will design and maintain automated UI, API, and service-level tests in TypeScript using Serenity/JS and Playwright, plus Python/pytest and C#/.NET. The role involves testing the ACE application and internal platform tooling for a decentralised AI platform optimising energy in data centres.

Work with Python, Linux, C#, Java, .NET, J2EE, Agile, TDD, and BDD. Develop a revolutionary marketing software platform that helps businesses attract and engage customers. Decisions are made by small teams of three or four developers who own pieces of the product.

As a .NET Developer you will work with .NET, .NET Core, C#, Azure SQL, and a CMS such as Sitecore, Optimizely, or Umbraco. You will develop complex enterprise .NET projects in tandem with Microsoft’s consultants. This role is on an award-winning .NET development team building revolutionary software solutions.

EPAM Systems★3.8 (703)· London

You'll develop full-stack enterprise software using Angular, .NET, AWS, and SQL databases, designing scalable architectures and implementing RESTful APIs and microservices. EPAM Systems is a global software engineering company. In this senior/lead role, you'll mentor junior engineers and advocate for engineering best practices across the team.

EPAM Systems★3.8 (703)· London

You will develop automated testing frameworks and evaluation pipelines using Python, Pytest, and BDD frameworks to validate MCP Servers and AI systems, assessing LLM accuracy, safety, and reliability while identifying agentic AI failure modes like hallucination and tool misuse. The role supports an AI-driven enterprise project for EPAM's client, exposing internal tooling to AI agents via Model Context Protocol in a Classic Agile environment, collaborating with engineering and product teams to define quality metrics and maintain CI/CD pipeline quality gates.

Fanatics★3.5 (2.8k)· London

You'll work with C# and cloud platforms (Azure preferred) to build scalable, high-performance real-time systems for Fanatics Betting & Gaming's risk and trading domain. The team develops event-driven architecture supporting sports betting operations across the Fanatics Sportsbook and Casino platform. This Staff Engineer role requires 8+ years of experience with demonstrable expertise in distributed systems, software design principles (SOLID, DDD, TDD), and thriving in fast-moving, entrepreneurial environments.

You'll work with Python, SQL, Linux, GIT, Autosys, JIRA, and TDD/BDD (PyTest), developing high-performance applications for a global banking environment. The role focuses on enhancing VAT recovery, improving regulatory reporting, and implementing AI-driven solutions, with responsibilities including mentoring junior developers.

Work with Java 11+ (ideally 17+), Spring Boot, Kafka, JMS, Akka, MongoDB, and TDD/BDD with modern CI/CD. You'll build and enhance low-latency, event-driven payment systems that process millions of transactions daily for Tier 1 banks. The role is a senior individual contributor within a high-skilled engineering team.

You will work with Kotlin (or Java), SQL, React, TypeScript, Redux, Tailwind, AWS/GCP/Azure, Terraform, Docker, and Kubernetes. You will design and build backend services for a large-scale marketing platform and machine learning platform for a global telecommunications client.

You will work with Java, Azure, Databricks, GitLab CI/CD, JUnit, Cucumber, and REST APIs. You will build scalable automation frameworks, test data pipelines, and support CI/CD integration for enterprise-grade cloud-native applications in banking or financial services.

You will use Java, JUnit/Cucumber for TDD/BDD automation, test REST APIs, and integrate with GitLab CI/CD pipelines. You will validate large-scale Databricks data pipelines and drive quality across cloud-native, Azure-based platforms.

Java, Spring Boot, microservices, cloud, TDD/BDD (JUnit, Spock, Mockito), and CI/CD tools (GitHub, Azure DevOps, Jenkins). You will build and evolve a post-trade clearing and prime brokerage platform, including in-house systems, APIs, and a client web portal. The role includes managing a small Java team and has an explicit pathway to Head of Engineering within 24 months.

You'll develop and deploy scalable backend systems using Node.js, TypeScript, GraphQL, REST, Kafka, Redis, Docker, Kubernetes, and Azure Cloud. The xAPI team builds experience APIs powering Tesco's online shopping across web, mobile, in-store, and voice platforms, handling traffic for product discovery, purchase, and returns affecting tens of millions of customers globally. You'll work in an agile engineering team collaborating with product managers on high-performance, observable systems at scale.

You will work with Playwright, Selenium, Cypress, Cucumber, JIRA, REST APIs, and CI/CD tools. The role designs and maintains automated test solutions for complex banking applications, embedding quality through TDD, BDD, and scaled agile delivery.