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

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 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.

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.

Build an LLM gateway in Go, using Kubernetes, SQL databases, and distributed caching to route and secure 75B+ daily tokens. The startup is building a "Cloudflare for AI" infrastructure gateway for enterprises like Shopify, Pfizer, and PWC. As a founding engineer, you'll work directly with the founders to shape architecture and culture.

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.

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.

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.

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.

Nomura★3.9 (502)· London

Develops and maintains proprietary algorithmic trading systems in Java for equity markets, using CI/CD, distributed systems, message-oriented and event-driven architectures. The team works with Quants to bring new trading strategies to market on a global, multi-asset platform that handles significant client order flow daily.

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.

Works with Java, integration patterns, CI/CD, observability, and cloud-native services, building reusable build kits, connectors, and platform services. As Engineering Manager in Integration at Sainsbury's Tech, leads a multi-skilled engineering team creating common integration capabilities that standardize how integrations are built, deployed, and operated across the retail business.

Develop and enhance Acturis' global SaaS insurance platform using

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.

You will work with SystemVerilog, Java, C, Python, cocotb, Vivado, Tcl, and networking protocols including TCP/IP. The FPGA team builds a pre-trade risk system that checks risk in nanoseconds for Tier 1 banks, covering RTL design through system-level integration.

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 Python, Flask/FastAPI, PostgreSQL, MySQL, MongoDB, Redis, Docker, Jenkins or GitLab CI/CD, Linux shell scripts, and Git. Build and maintain automation solutions, REST APIs, and tooling for large-scale telecom network operations, supporting 5G and enterprise platform testing and monitoring.

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.