Work with Python, PyTorch, TensorFlow, Scikit-learn, XGBoost, AWS (SageMaker, Lambda, S3), MLflow, LangChain and other MLOps/LLMOps frameworks to build and deploy ML and generative AI solutions. You will design production-ready models for forecasting, classification, and anomaly detection, as well as LLM-powered applications, supporting defence, government, and national security clients as part of a technology consultancy.

This Full Stack Engineering Lead role at Citi’s Finance Technology team involves hands-on development with Java, Spring Boot, Spring Cloud, React, TypeScript, Node.js, and microservices. The team is re-platforming applications to support the Finance business, focusing on building scalable solutions for regulatory and operational needs. Testing practices use Jest, Cypress, JUnit, and Mockito, with AWS or GCP experience as a plus.

React Native developer will work with JavaScript/TypeScript, APIs, and CI/CD to build and optimise mobile apps for iOS and Android. The role is with a FinTech undergoing a digital transformation programme, modernising core mobile products and improving user journeys.

Senior Software Engineer for pricing and availability systems on a global travel and e-commerce platform, using TypeScript, Node.js, C#/.NET or Python, and SQL. Work involves building pricing, quote-caching and availability services, resilient APIs, and improving performance and observability with tools like Datadog and Terraform.

Senior Kotlin backend role with full-stack exposure to Angular/React, Spring AI, reactive streams, and event-driven tools like Kafka or RabbitMQ. You'll build a data integration platform for banks, an open-source schema language, and a greenfield AI agent for autonomous orchestration.

Work with React, TypeScript, and REST API integration to build analyst-facing interfaces on a next-generation Defence Intelligence platform. The role supports a major AI-enabled Defence programme, improving operational decision-making for mission-critical users.

You'll work with TypeScript, Node.js, Go, AWS, PostgreSQL, and event-driven architecture, building AI infrastructure including vector stores and LLM orchestration. Fanvue is a Series A AI-powered creator platform connecting millions of fans with creators. This role leads the platform's monolith-to-services decomposition and AI infrastructure evolution.

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.

Build a comprehensive platform for 1,500+ charities using TypeScript, React, and Node.js. You will architect features like grant management, AI impact reporting, and safeguarding tools, and build migration tools for charities. Work in a high-autonomy team of 15.

Build customer-facing web applications with React, Next.js, Node.js, TypeScript, and Postgres. You will work on transactional flows involving payments for SwapTix, a ticket exchange platform.

Big Potato· London

You will own and evolve a Flutter companion app and confidently handle backend work on Node/TypeScript MongoDB systems. Additionally, you will maintain the gaming web platform and its integrations. The role works closely with a Senior Game Developer on the platforms behind Big Potato's games.

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.

You will work with TensorFlow, PyTorch, Hugging Face, and generative AI models, focusing on ML infrastructure and model deployment. As Manager, Applied AI Engineering at Google DeepMind, you lead a team developing and deploying novel generative AI applications, translating research into real-world products.

You would work with TypeScript, Golang, Postgres, Kafka, Vercel, and AWS, building the product and owning greenfield development for an AI-focused B2B SaaS business automating processes for global SaaS clients. As the Engineering Lead, you would steer a highly collaborative team about to double in size.

Develop and enhance Acturis' global SaaS insurance platform using

You will work with React, TypeScript, Node.js, Express, PostgreSQL, and AWS. The team builds B2B SaaS technology used by leading UK retail brands, evolving the product.

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.

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.

You'll work with Python, PyTorch, TensorFlow, LLMs, Azure OpenAI, and Docker in an Agile environment. The company is an AI startup building large language model applications for enterprise clients, where you'll design, build, and maintain scalable solutions.

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.

You'll use Zapier, Make, n8n, Python or JavaScript, APIs, SQL, and webhooks. You'll own the automation layer for influencer marketing, building workflows for discovery, onboarding, contracts, content tracking, reporting, and payments.