46,171 London jobs
Open tech roles based in London.
Trainee Data Engineer
Trainee Data Engineer at East London NHS Foundation Trust (ELFT), a London NHS healthcare trust: a 12-month job-share role supporting the Data Warehouse team with day-to-day ETL/ELT of clinical and non-clinical data into an Azure cloud data warehouse, using T-SQL, data modelling and ETL packages.
Data Engineer
Lead Data Engineer and first senior data hire at a fast-growing London startup building an AI platform for property management. You'll own data architecture, build and scale pipelines (Python, SQL, Apache Spark/Airflow/Kafka), and shape technical direction alongside the founders. On-site in London 4 days a week; salary up to £160k plus equity.
Principal Backend Engineer Java Spring Boot AWS
Lead the design and delivery of technology projects for financial services clients as a hands-on Principal Backend Engineer: build scalable Java/Spring Boot microservices, modernise legacy systems and migrate them to AWS, design REST APIs and distributed systems, and improve CI/CD and DevOps practices. Hybrid, London-based role.
Junior Java Engineer — Fintech Trading Platform
Junior Java developer at Fasanara Digital in London, supporting 24/7 trading systems under senior guidance. Works on a multi-venue collateral management platform using Java and Kotlin across traditional finance and digital asset infrastructure.
Python Software Engineer Agentic AI
Build Python backend services and JSON REST APIs with a focus on prompt engineering and LLMs, deploying intelligent agents (Claude, ChatGPT) that automate real business tasks alongside a Technical Architect, in a London-based startup-like team.
Senior Python Software Engineer - FinTech
Senior Python engineer who leads end-to-end design and delivery of fintech software at a product-focused London team: shaping architecture, working across backend, data processing and complex financial systems, and driving AI/LLM adoption. Core stack is Python with Django or FastAPI; hybrid work, salary up to £120k.
Senior Python Software Engineer
Senior Python engineer at Citadel Securities in London who designs, builds, and supports software serving multiple business areas, including timely, reliable systems for trading activities. Core stack: Python, Linux, scripting, and distributed systems in a fast-paced trading environment.
Lead Software Engineer Python API - Fintech
Lead a small engineering team delivering features and refactoring a core banking platform, balancing architecture with hands-on Python (FastAPI) API development, cloud work (GCP preferred) and CI/CD improvements. Hybrid role based in central London, integrating with partners like HSBC.
Junior Java Software Developer
Junior developer at Fasanara Digital building and maintaining a multi-venue collateral management platform plus reference data and accounting infrastructure that supports 24/7 trading in digital assets and traditional markets. Day to day: new development, debugging production code, and trading-venue integrations, primarily in Java and Kotlin.
Senior iOS Software Engineer
Senior iOS engineer at TripActions in London building an AI-powered, conversational travel assistant app — designing and shipping Swift/SwiftUI features with async/await, real-time AI interactions, offline support, and strong performance and privacy, in collaboration with product, design, and backend teams.
Java Developer Kafka API - Tech Consultancy
Hands-on backend Java role at a global tech consultancy, building and delivering projects for financial services clients with a focus on Kafka messaging, microservices, AWS cloud migration and CI/CD. Day to day involves designing scalable systems, deploying to cloud, and working closely with clients and cross-functional teams.
iOS Developer
iOS Engineering Team Lead at a sustainability-focused tech company serving EV customers in London (hybrid, 3 days on-site). You lead and grow the mobile team (60-70% leadership) while staying hands-on with Swift and SwiftUI, shipping customer-facing features in a production iOS app.
Senior Frontend Engineer
Senior Frontend Engineer at Coralogix building the UI for its observability platform products (Explore, APM, RUM) using Angular and TypeScript. The role owns features end-to-end in a full-stack product team, from UX decisions and architecture through backend integration and production.
Cyber Security Consultant - Strategy, Engagement & Risk
Cyber Security Consultant focused on strategy, risk management, and stakeholder engagement for public sector and government clients, utilizing frameworks like NIST, CAF, and ISO27001 in a hybrid role based in London or Cheltenham.
Healthcare Consulting Manager
Daintta are a rapidly growing, values-driven team of specialists who work with public sector, including UK Health and Care (NHS) and government clients across Cyber, Telecommunications and Data. We are seeking a…
Solution Engineer Price & Promotions
A Solution Engineer on RELEX's EMEA Central team implements and configures the Price & Promotions platform for retail customers across the UK, DACH, BENELUX and South Africa — designing integrations, tuning forecast models, and writing customer-specific business logic in SQL, Go and Python. Requires fluent English and German.
Space & Merchandising Consultant (m/f/d)
Consultant implements retail space, assortment, pricing, and promotion planning software for European customers, configuring systems to optimize retail operations.
Senior AI GTM Engineer, AI and Applications
About the role RELEX’s GTM AI team in Sales builds the AI our sellers use every day. We work across three areas. Salesforce holds the record and runs the sales motion. Claude is a primary surface on which our sellers…
ABM Operations Manager, AI & Automation
About the role Our ABM team runs highly targeted programs for the accounts that matter most to RELEX. We want those programs to be even more personalized, more interactive, and faster to launch across channels, without…