Senior Java Developer using Java, Spring, and AWS. You will design, build, and maintain features on a live SaaS platform for a HealthTech company that delivers patient care and rehabilitation software.

Senior back-end Java developers will deliver scalable, enterprise-grade applications using Java in a complex technology environment for a global investment bank’s Risk function.

Developers use C#/.NET, Java, or Python, along with SQL databases and cloud platforms like Azure or AWS. The role involves problem-solving and communicating with technical and non-technical audiences, with no specific project or team scope detailed.

Morgan Stanley★3.8 (5.4k)· London

You'll work with core Java on UNIX/Linux, Git/Stash, Jenkins, JUnit, REST, TypeScript/Angular, low-latency messaging middleware, KDB/q, and FIX protocol. The role builds, deploys, and supports algorithmic trading strategies, analytical tools, and scalable trading engine infrastructure for automated systems in Equities. As a VP-level Lead, you'll manage multiple functions and guide junior staff.

You will work with Java, Spring Boot, Hibernate, REST APIs, microservices, Spring MVC, Spring Data JPA, Spring Security, and SQL databases (MySQL/PostgreSQL). You will design, develop, and maintain scalable Java-based applications and microservices for enterprise clients as part of a UK-based IT consultancy serving Fortune 500 and FTSE 100 companies.

Lead a ~132-person engineering org (5 direct reports) building financial services for Africa on Python/GraphQL, Postgres/Redis, Kotlin, Swift, TypeScript/React, GCP, Kubernetes, and Terraform—including AI-powered voice and digital agents handling 10M+ monthly interactions.

You'll work with JavaScript, ElasticSearch, OpenSearch, MongoDB, Apache Kafka, EKS and Kubernetes on Ripjar's Labyrinth Screening SaaS platform, which automates detection of financial crime for banks and governments. This role leads technical decisions and architecture for scaling the platform.

You will work with Python, TypeScript, React, Postgres, cloud data pipelines, and grid modelling tools like pandapower or PowerFactory. Squid is a Y Combinator-backed startup building an agentic modelling platform for power grids. As a founding engineer, you will build production software for grid operators, developing validation tools and human-in-the-loop systems.

Staff will architect a monolith-to-event-driven-services transition, optimizing PostgreSQL and building AI infrastructure (vector stores, LLM orchestration, embeddings, real-time chat) using TypeScript, Node.js, Go, and AWS. This role leads engineering for Fanvue, an AI-powered creator platform connecting millions of users, while mentoring teams through code reviews and design sessions.

React, Node/TypeScript, relational

Work with Java, Spring Boot, Docker, Kubernetes, and message brokers to design cloud-native microservices and event-driven systems. You will lead development of Chip Financial Ltd’s unique Lombard lending platform for its proprietary brand and SaaS clients. Mentor junior engineers in a high-impact fintech environment.

Work with Java, Spring Boot, Hibernate, microservices, REST APIs, PostgreSQL/Oracle, and testing tools (JUnit, Cucumber, Wiremock, Mockito) in an agile, DevOps environment. You will build and improve the prepaid payment platform for Edenred PayTech, delivering features across the full development lifecycle.

Samsara★3.6 (32)· London

Work with Golang, TypeScript, React, GraphQL, and React Native. As a new grad, you’ll build backend infrastructure for an IoT platform, full-stack web features, mobile app infrastructure, or embedded software that runs on Samsara hardware.

Elliptic★0.0· London

You'll lead a DevOps team owning Kubernetes/EKS platforms, service meshes (Istio/Linkerd), GitOps (Flux/ArgoCD), Terraform, Vault, OPA, and CI/CD security tooling. The company provides blockchain analytics to trace and disrupt illicit cryptocurrency laundering. The role is a hands-on team lead setting infrastructure, automation, and reliability direction.

Beamery★4.0 (1)· London

You will work with dbt, BigQuery, Kafka, PostgreSQL, MongoDB, Kubernetes, Python, and TypeScript/Node.js to build production ETL pipelines and an analytics layer. The data platform powers Beamery’s reporting and AI strategy, serving the company’s jobs, skills, and tasks data platform for talent lifecycle management.

Beamery★4.0 (1)· London

Architect Beamery’s data platform using dbt, BigQuery, Kafka, PostgreSQL, MongoDB, Typescript/Node.js, Kubernetes, Python, and Segment. The platform powers reporting and AI strategy for a skills and talent lifecycle management system. This is a senior individual contributor role setting long-term technical direction.

You will use TypeScript, React, and Node to architect and implement a greenfield financial platform—including ledger, custody, and settlement systems—for cross-border payments in emerging markets. This zero-to-one role builds full-stack wallet and virtual account features bridging digital assets with traditional banking rails.

Build and ship end-to-end features using TypeScript, Vue.js/Nuxt.js, Node.js, Docker, AWS, MySQL, and AI-assisted tools like Claude. You’ll own infrastructure and deployment for &Dine’s online food marketplace connecting independent makers with customers. Join a lean engineering team of four.

You will build Venmark’s AI-platform from scratch using NextJS, Java, TypeScript, and AI-powered workflow automations. The company is an AI-native certification firm transforming the testing, inspection, and certification market by acquiring and integrating traditional providers onto a modern platform. As the first tech hire, you will embed with acquired SMEs across the UK.

Public Sector Resourcing★1.0 (1)· London

Work with Python, AWS, and Terraform to design, build, and maintain cloud-native applications. Support the National Cyber Crime Unit’s mission to disrupt online organised crime by developing AI-driven capabilities and automating operational processes within a multidisciplinary technical team.

FDM Group★2.9 (270)· London

Lead multiple cross-functional engineering teams for a banking/lending technology programme at a financial services client. Oversee ~20 engineers across 3-4 feature teams using Java, Spring Boot, React/React Native, and cloud-based solutions. Drive DevOps, CI/CD, secure coding, and platform modernisation.

You will work with Python, TypeScript, Rust, and Claude Code to build foundational infrastructure for monitoring AI models, preventing misuse, and detecting unwanted model behaviors. The Safeguards team develops systems for data storage, metrics, evaluations, and tooling for human and agentic review that operate at scale. The team size or scope is not stated.

You will work with TypeScript, React, and 3D/WebGL tools including Three.js, deck.gl, or Cesium. As the first product-focused engineer, you will own the user experience and visualization layer of a subsurface mapping platform that transforms complex ML models into interactive 3D tools for global mining leaders.

Founding Product Platform Engineer working full-stack with Python, FastAPI, React, TypeScript, and SQL (BigQuery/Snowflake). Build the platform layer for a decision platform that helps high-stakes teams explore outcomes and understand uncertainty, translating complex AI workflows into repeatable B2B products. As the first dedicated product engineering hire, you will architect platform foundations including auth, permissions, and APIs.

You'll work with Python, TypeScript, AWS, Azure, GCP, PyTorch, LangGraph, LangChain, DSPy, Langfuse, and Inspect, building AI products for the UK Government across health, education, and planning. You'll prototype, evaluate, and deploy AI solutions in small teams, owning problems from idea to production.