Work with Python, AWS, and Kubernetes to build and maintain custom integrations, API fixes, and SDKs for a voice AI startup. You will support the Forward Deployed Engineering team, managing one-off integrations, platform fixes, and custom builds for enterprise clients deploying large-scale voice infrastructure.

Build features across a Svelte/TypeScript front end and Python back end using FastAPI, Django, PostgreSQL, and AWS. Tab is a YC-backed London travel fintech processing thousands of real-time payments per hour for over 100,000 global tourism businesses in 100+ currencies.

Use Python (FastAPI/Django) and Svelte with TypeScript to build and scale a payments platform processing 100 currencies and a discovery engine listing 100,000+ tourism businesses. Work on AWS cloud infrastructure and real-time transaction processing as part of a profitable, lean team of nine.

Harvey Nash★3.8 (49)· London

You will build enterprise-scale applications using Java, Spring Boot, microservices, and front-end technologies (likely React or Angular), with exposure to AI tools and modern DevOps practices. You will join a high-performing engineering team at Harvey Nash, developing large-scale software solutions in a hybrid London-based setting.

Senior Java Full Stack Developer building large-scale enterprise applications for a global financial services firm. You will work with Java and embrace AI-powered development on modern software engineering projects.

A Java Full Stack Developer role building enterprise software and embracing AI-powered development. You will work on large-scale enterprise applications within a global financial services organisation, using Java as the core technology.

You will work with Angular and .NET to build and maintain front-office web applications, migrating legacy systems onto modern frameworks as part of a Markets IT team at a global investment bank.

Senior full-stack role designing and scaling cloud-native applications for a global investment bank’s risk management space. Technologies include Java, Kotlin, React, and AWS. Work involves end-to-end development alongside cross-functional engineering teams.

You will work with Astro, Sanity, GROQ, Portable Text, TypeScript, HTML, CSS, Tailwind CSS v4, Figma, SSR, serverless/edge runtimes, SQL, and CI. You will co-own the component library, content model, and rendering stack for synthesia.io, the marketing website of the world’s leading AI video platform.

Work with Java 17 & 21, microservices, event-driven architectures, Kafka, IBM MQ, AWS, Docker, Oracle SQL/PLSQL, Git, Jenkins, Jira, and RESTful APIs, with exposure to Golang or AI. You'll join a FinTech engineering team building scalable backend services and distributed applications in an agile environment.

SharkNinja★2.9 (146)· London

You’ll work with HTML, CSS, JavaScript/TypeScript, React or Vue, Git, Jira, Figma, and AI tools like Claude Enterprise, coding assistants, and automated testing. As a CodeShark, you’ll be embedded in SharkNinja’s D2C business, fixing website bugs and bridging Design and Engineering to improve consumer-facing sites. This is an early-career fixed-term role.

The API Platform team owns Perplexity's public-facing surface: the Search API, Agent API, SDKs, and docs. Engineers work in Go, Rust, and Python across cloud infrastructure, Kubernetes, and CI/CD, building agent-consumed surfaces like hosted MCP, tool calling, and auth flows while owning APIs end to end from RFC to production.

Build cross-platform mobile apps with React Native + TypeScript and native Swift/Kotlin for hardware/sensor integrations, plus offline-first architectures. You will own mobile product development for an AI startup that builds custom, AI-native software modernizing field operations.

You’ll build full-stack features with Python (FastAPI), React, Next.js, and own AWS infrastructure, data pipelines (dbt, BigQuery, Airbyte), and AI/ML initiatives (LLM agents, computer vision). Sojo is a B Corp fashion-tech startup making clothing repairs simple. As the primary full-time engineer, you’ll own architecture and shape engineering culture.

Build and maintain backend services in Node.js/TypeScript and Ruby/Rails, frontend apps in Nuxt, and infrastructure as code using AWS CDK with serverless event-driven architecture, plus Salesforce development. The "In Life" squad delivers improvements to core backend services and Digital Renewals customer journeys for Bionic, the UK's leading business comparison and switching service for small businesses.

Work with JavaScript/TypeScript, React, Redux, Golang, NodeJS, PostgreSQL, MongoDB, AWS, Terraform, Docker, and Kubernetes. You will join an internal product incubator squad focused on exploring and developing new product opportunities for Cuvva, which offers short-term car insurance through its app.

You'll develop responsive web apps with HTML5, CSS3, modern JavaScript (ES6+), React/Angular/Vue.js, REST APIs, Git, and testing frameworks; TypeScript, Next.js/Nuxt, Node.js, CI/CD, Azure/AWS are desirable. The engineering team builds modern, user-focused web applications alongside product managers, UX designers, and backend engineers. No team size is stated.

Build backend services and APIs in Python and FastAPI, working with PostgreSQL, ClickHouse, SQL, LLMs (OpenAI, Anthropic) and embeddings/vector databases. You will develop the production infrastructure and orchestration layer for agentic AI capabilities powering a data intelligence platform used by 300+ VC and PE firms for private markets insights.

You will work with HTML, CSS, JavaScript/TypeScript, React/Vue, Git, Jira, Figma, and AI tools like Claude Enterprise. As a CodeShark embedded in SharkNinja's D2C business, you fix bugs from a ticket backlog, accelerate velocity, and translate design intent into buildable requirements for websites millions visit.

You will architect and build a real-time computer vision system using C++ (17+), GPU inference (CUDA/TensorRT), OpenCV, GStreamer, gRPC/Protobuf, Kafka, Debezium, Redis, PostgreSQL, React/Next.js, FastAPI, Docker, Ansible, and Azure. The project is AI4Fibres, an AI-powered textile recycling system for transforming garment waste. No team size is stated.

Robert Half★3.9 (231)· London

Full Stack Engineer using Python (FastAPI), React/TypeScript, SQL, cloud infrastructure, and CI/CD to drive architecture and delivery of a growing SaaS platform. Must hold or be eligible for SC Clearance. Role includes technical leadership and team mentorship.

You will build frontend applications with React, TypeScript, JavaScript (ES6+), Material UI, WebSockets, and GraphQL. The company creates real-time products for enterprise customers in specialised financial markets. You join a small, experienced engineering team with significant ownership.

Work with core Python and OOP to engineer backend services for a small development team supporting all trading desks in a structured products hedging division, helping quants and technology teams deliver scalable trading services and modernise core platforms.

You will work with Python, TypeScript, AWS, PostgreSQL, event-driven architectures, and CI/CD. The small engineering team builds a platform combining real-time data, distributed hardware, AI, and energy trading to modernize the electricity grid.

Work with Python, Django, REST APIs, and PostgreSQL to build scalable backend services, APIs, and distributed microservices. You will join a small engineering team at a product-led fintech company creating real-time enterprise platforms for specialised financial markets.