Build scalable backend systems, APIs, data pipelines, and DevOps practices using Python or full-stack JavaScript, integrating voice, reasoning, and context management. You will ship end-to-end product features for an AI layer designed to autonomously run small businesses for thousands of customers.

You will architect and build a greenfield financial platform for cross-border payments in emerging markets, using TypeScript, React, and Node to ship user-facing features. You will design ledger infrastructure, custody layers, wallet systems, virtual accounts, and automated settlement workflows that integrate digital assets with traditional banking rails.

You will work with React, React Native, Node.js, TypeScript, SQL, AWS, and cloud-native AI-powered products. The company is a Series A–funded, fast-growing tech business building products that matter and planning to double in size. This Staff Engineer role owns business-critical product areas and mentors engineers while remaining deeply hands-on.

Python, FastAPI, TypeScript, React, and GCP. Electric Twin builds a behavioral simulation platform that creates digital twins of populations to predict human behavior. You will join a team of 17.

Build and deploy production-grade agentic systems and RAG pipelines with Python, TypeScript, FastAPI, and React. As a founding engineer, lead architectural development of an AI-driven agency model replacing traditional property-market manual workflows with autonomous agents.

As a founding AI engineer, you’ll build production algorithms and evaluation pipelines using Python, LLMs, prompt engineering, OpenAI evals, PostgreSQL, and React/TypeScript. You will develop AI for patent generation, pushing LLM boundaries to boost efficiency for 400+ global IP teams. You work directly with PhD founders from UCL and Cambridge.

Work with JavaScript, Vue.js/React/Angular, HTML/CSS, and Figma to build scalable UI components. Join TransPerfect’s TechOps team, which delivers technology and interfaces for the company’s GlobalLink platform.

Work with a modern TypeScript stack: Next.js App Router, Server Actions, React 19, Node.js, Drizzle ORM, PostgreSQL, Playwright, Vitest, and GitHub Actions. Join Rentmigo's two-person engineering team to build and scale the core platform for their seed-stage PropTech startup, which allows UK renters to build credit history and wealth through monthly payments. As the third engineer, you'll own features end-to-end and influence architectural decisions.

You will work with Java 17+, Spring Boot, Oracle SQL, document store DBs, Kubernetes, Jenkins, and GitHub Copilot. The investment bank team builds mission-critical, high-performance systems providing end-to-end visibility into payment lifecycles for technical, operations, and reporting teams.

You will apply your sustainability expertise using AI tools for research, content creation, and knowledge management while supporting Sweep's carbon accounting platform. You will help customers navigate their sustainability journey by providing practical guidance on methodologies, regulatory frameworks (GHG Protocol, CSRD, SBTi), and reporting standards. You will act as an internal sustainability reference, enabling colleagues and directly advising customers across presales, implementation, and long-term partnership.

This role involves maintaining and building data pipelines using SQL, Python/Java, and cloud tools like Google Cloud Platform, BigQuery, Airflow, dbt, and Apache Spark. The team supports data analytics and reporting for a media company's portfolio. It focuses on integrating data from web analytics, CMS, subscription, and ad tech sources to enable business intelligence.

Salesforce★4.2 (1.5k)· London

Works with Salesforce Agentforce, Data360, MCP, A2A

Klue Inc.★5.0 (13)· London

Use LinkedIn, AI, personalized email, and cold calls to generate and nurture leads for Klue's competitive intelligence platform.

Competition & Markets Authority★3.7 (15)· London

Data scientists join a ~20-person Data Science & Data Engineering team building tools on AWS, using Python, Git/GitHub, generative AI, agentic AI frameworks and web apps. The CMA regulates digital markets and protects consumers by analysing large-scale data and algorithms to ensure fair competition.

Work with Cypress, Playwright, Selenium, Appium, Postman, Jira, and Git to build and maintain automated test suites integrated into a CI/CD pipeline. As part of Reset Health's QA team, you will design manual and automated tests for web and native mobile apps while helping transition to greater automation and AI under an ISO13485 QMS.

NatWest Group★3.7 (1.2k)· London

You'll work with Cisco and Arista platforms, VxLAN, EVPN, Cisco Meraki, and multicast protocols to engineer and automate enterprise network infrastructure. This role supports NatWest Group's digital transformation, building secure, scalable network solutions for its financial services environment.

Fintricity★1.0 (1)· London

You will work with Python, TypeScript, LLMs, agent frameworks, RAG systems, vector databases, LangGraph, LangChain, and cloud services. The role builds enterprise-grade AI infrastructure for agentic systems, including AI gateways, model orchestration, and agent control planes at Fintricity and Kendra Labs.

Flagstone Investment Management★2.0 (4)· London

A Staff Engineer will work with React, React Native, TypeScript, and Azure, focusing on front-end and mobile technical strategy, architecture, and delivery. They lead cross-team initiatives and coach engineers across a tribe of 3–5 squads at Flagstone, an online savings platform. The role involves owning a shared design system and driving front-end engineering practices.

You will work with Cypher, Neo4j, Terraform, REST APIs, Kafka/Confluent, Python, JavaScript, React, Go, OAuth 2.0, AuthZEN, and AI tools like Gemini and Claude. IndyKite builds a data trust and AI enablement platform using a live context graph to secure agentic AI workloads with identity-centric authorization. You will act as a technical evangelist, delivering demos, proofs of concept, and architectural guidance across enterprise sales cycles.

Persistent Systems★3.9 (626)· London

Work with Java, iOS, Swift, mobile architecture patterns, Test-Driven Development, and automated mobile testing tools to design and build the user interface and user experience for iOS financial applications. The role also involves cross-functional collaboration, code reviews, and ensuring scalable, maintainable, and optimized code.

Luxoft★4.5 (669)· London

You'll build an investment-insights solution using Agentic AI, working with Python, FastAPI, AWS, Git/CI/CD, vector databases, RAG patterns, and LLMs like OpenAI/Anthropic. The project generates investment insights from sales and research materials to speed client-meeting preparation. Nice-to-have skills include React/TypeScript and AgentCore, but team size is unstated.

NatWest Group★3.7 (1.2k)· London

You will work with React, Java, Spring Boot, REST APIs, Kafka, IBM MQ, iOS, and Android, applying test-driven development and Agile practices. As a member of a permanent feature team, you will design, develop, and test software for the bank’s platform, collaborating with engineers and architects.

Design, build, and optimize ServiceNow solutions using Script Includes, Business Rules, Client Scripts, Flow Designer, IntegrationHub, REST/SOAP APIs, MID Server, and App Engine. Develop across ITSM, CMDB, and Service Portal for enterprise environments. Mentor junior developers and enforce platform standards.

Big Potato★0.0· London

Own the Flutter companion app for Big Potato's board games, using Dart, Flutter, Node.js, TypeScript, MongoDB, and Next.js/React. You'll build daily games with Flame or Unity, integrate REST APIs, Shopify, payments, and analytics, and use AI tools daily to accelerate coding, refactoring, and testing.

Design software using Java, C#, Python, JavaScript, TypeScript, or Go, with REST APIs, microservices, SQL databases (PostgreSQL, SQL Server, MySQL, Oracle, MongoDB), and cloud platforms (AWS, Azure, GCP). You will build enterprise applications and business-critical services across the full development lifecycle.