You will work with C++, Python, Linux, machine learning/statistical libraries, Google Cloud, Airflow, InfluxDB, and Grafana. The role builds data pipelines, prediction tools, and infrastructure for systematic equities trading, supporting quantitative research and large-scale computation.

This role supports eTrading platforms using Windows/Linux, Bash, PowerShell, Python,

You’ll develop components for a research and trading platform used by quant researchers and portfolio managers, working in Python and relational databases with optional AWS/GCP, CI/CD, and containerized environments. The team builds scalable backtesting tools, data pipelines, and production-grade research infrastructure. This is a Python developer role; no team size is stated.

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.

The traineeship covers Linux, shell scripting, Git, Docker, CI/CD, Infrastructure as Code, and cloud platforms like AWS, Azure, and Google Cloud. You will build practical projects such as CI/CD pipelines, cloud deployments, and container management. This is a training programme for candidates with no prior DevOps experience.

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.

You will work with SQL, Python, DBT, Fivetran, Airflow, Snowflake, Git, and cloud platforms (AWS, Azure, or GCP). The role designs, builds, and maintains scalable data platforms and pipelines that power analytics, reporting, and data-driven decision-making. No team size is stated.

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.

You will lead Cloud Engineering or Infrastructure Engineering teams, working with Azure (including Landing Zones, networking, identity, and security), Google Cloud Platform, Terraform, Bicep, and Infrastructure as Code. The team focuses on cloud engineering and infrastructure.

You will work with data preprocessing techniques, data pipelines, and cloud platforms (AWS, GCP, Azure) along with MLOps practices. This graduate role is for Tech Recruitment UK Ltd, a recruitment firm that places candidates in AI/ML positions. No specific team or product details are listed.

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.

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.

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.

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.

Harvey Nash★3.8 (49)· London

Lead backend development of enterprise-grade Java solutions for an Investment Bank. Core technologies include Java and server-side development; the role drives architectural decisions for scalable systems and guides development teams on technical strategy and best practices.

Work with Java, Spring, and AWS on a cross-functional, service-oriented team extending and maintaining Awin's Affiliate Marketing platform. You will design reliable services, write clean, well-tested code, and take ownership of meaningful engineering challenges.