Build production-grade agentic AI systems using Python, modern LLM frameworks, orchestration tools, RAG pipelines, and evaluation/observability tools. The team solves critical real-world problems for manufacturing, utilities, aviation, and field operations. A small, high-calibre engineering team with genuine ownership.

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 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.

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.

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.

Build backend services and APIs using Python (≈70%), TypeScript, AWS, PostgreSQL, and event-driven systems. You'll work on a climate-tech platform that combines real-time data, AI, and energy trading to optimize the electricity grid. Join a small, early-stage engineering team with high ownership and influence over product and technical direction.

Senior Full Stack Engineer working with Python (Django, FastAPI), TypeScript, React, Astro, Svelte, PostgreSQL, AWS, Terraform, and frontier AI models via Amazon Bedrock. Build and scale AI products within small cross-functional teams, owning everything from infrastructure and APIs to user-facing interfaces. Hands-on role with significant ownership, including mentoring and shaping technical direction from discovery to deployment.

Lead projects developing scalable web apps for global financial clients using React, TypeScript, modern CSS (Flexbox/Grid, SASS, Material UI), Redux, Webpack, and Jest/Mocha. You will mentor engineers, drive front-end strategy, and work with DevOps/CI/CD and containerisation (Docker/Kubernetes).

You will work with C#, .NET, Angular, Python, REST APIs, SQL/NoSQL, Docker, Kubernetes, Git, and CI/CD. The company develops highly secure software for mission-critical environments within defence, government, or national security. You will join a small, collaborative engineering team.

You will work with Python, FastAPI, PostgreSQL, ClickHouse, OpenAI, Anthropic, and production APIs. The team builds the Bloomberg of Private Markets, providing AI-powered discovery of investment opportunities for 300+ VC and PE firms. You will build backend infrastructure powering new AI features.

Full stack developers will use Python, Django, HTML5, CSS3, SASS/LESS, JavaScript, React/Angular, AWS, Ansible, and PostgreSQL. The company builds blockchain technology for the financial industry, and the role involves scaling an existing platform within a tight-knit team.

Verisk★3.5 (361)· London

Principal Engineer using TypeScript, JavaScript, Angular, Node.js, Azure or AWS, microservices, and CI/CD with Docker and Kubernetes. Builds cloud-native, large-scale software for Verisk's data, analytics, and technology platform that serves the global insurance industry. Provides technical leadership across multiple teams and products.

React, TypeScript, JavaScript, React Hooks, ChartJS, NextJS, and REST APIs. You will join a front-office development team at a hedge fund, rebuilding a greenfield Portfolio Management Application Suite using React and JavaScript with some AI/ML.

You'll work with React/Next.js, Node/Python, and Supabase/Firebase/Postgres, using AI tools like Copilot/ChatGPT. You'll build and ship features end-to-end for Entourage, a modular fan engagement platform for sport covering game organisation, payments, rewards, social/behavioural tracking, and event activations.

JPMorgan★3.9 (20k)· London

You will work with Java, TypeScript, React, Scala, SQL and No-SQL databases on cloud-native platforms. As part of JPMorganChase’s Data Platforms team within the Chief Data & Analytics Office, you will engineer solutions in metadata, meta-modelling, distributed systems, domain-specific languages and interpreter design. You will provide technical guidance to the team.

JPMorgan★3.9 (20k)· London

Lead Scala/Java Software Engineer on the Data Platforms team within JPMorgan Chase’s Chief Data & Analytics Office, leading an agile team to build scalable, secure technology products. Works with Scala, Java, Cats Effect, SQL/No-SQL databases, and AI-assisted development tools, focusing on metadata, meta-modelling, distributed systems, and domain-specific language design.

JPMorgan★3.9 (20k)· London

Senior Lead Software Engineer role on JPMorgan's Data Platforms team in the Chief Data & Analytics Office, working with Scala, Java, Cats Effect, and cloud-native technologies. The agile team builds secure, scalable technology products spanning metadata, meta-modelling, and distributed systems, with a focus on AI-assisted engineering and domain-specific languages.

You will work with Python (Django, FastAPI), TypeScript, React, Astro, Svelte, PostgreSQL, AWS, Terraform, and frontier LLMs via Amazon Bedrock. Your team builds AI products inside the UK government that change public services across education, health, planning, and parliament.

Junior C# and ASP.NET developers will use SQL, .NET Core/Framework, JavaScript and Azure to build a centralized SaaS platform for FX payments, helping financial institutions manage compliance, costs and cashflow.

C# and .NET developers will build and maintain APIs and backend services for a connected home beer ecosystem spanning hardware, mobile apps, cloud services, and eCommerce—working with relational databases, Git, and desirable AWS or Azure cloud exposure.

You will work with Python (Django/FastAPI), TypeScript, React, Astro, Svelte, PostgreSQL, AWS, Terraform, and frontier AI models via Amazon Bedrock. You'll own technical direction, mentor engineers, and build AI products for UK public services in health, education, planning, and Parliament. The role is in small, empowered, cross-functional teams.

As a Node.js/TypeScript Engineer in Sainsbury's Martech domain, you'll work on the Multichannel Messaging Hub (MMH) team using JavaScript, TypeScript, Node.js, microservices, Kafka, Snowflake, Kubernetes, AWS Serverless, and Terraform. The team orchestrates campaign delivery across email

Work with Vue.js, React, Angular, JavaScript, HTML/CSS, Figma, and Agile (SCRUM/Kanban) to build reusable UI components and optimize performance. Join the TransPerfect TechOps team delivering the GlobalLink platform and client interfaces.

Build AI voice agents for trades businesses using Python, TypeScript, cloud infrastructure, event-driven systems, and third-party integrations. This Series A, YC-backed startup is scaling rapidly with real revenue, and you will own features end-to-end as a founding engineer.