You will build a new Commercial Management platform from scratch using C#/.NET and React, working with AI-native tools like Claude Code and cloud platforms (Azure, AWS, or GCP). The product gives construction businesses real-time visibility into project performance, commercial risk, and profitability. As a founding engineer, you will help take this product from MVP to a fully commercial SaaS platform.

You'll build features using Svelte/TypeScript on the front end and Python (FastAPI/Django) on the back end, with AWS infrastructure. Tab is a profitable London travel fintech processing real-time payments in 100+ currencies for over 100,000 independent tourism businesses globally.

Work with Angular 19, FastAPI, Python, and Kubernetes. Join a 13-person team shipping high-impact features like product launches and partner integrations for Urban Jungle's insurtech platform serving 300,000+ customers.

You'll build Python backends, React frontends, and core ML systems for an AI-driven vulnerability management platform that prioritizes cybersecurity threats using attacker logic. You will own model training, evaluation pipelines, and agentic AI features.

You will work with TypeScript, JavaScript, gRPC, Redux, React Native, React, Next.js, and infrastructure like Google Cloud Platform, Kubernetes, and Docker. The role focuses on building new features and integrations for Emma’s mobile and web apps, which help users manage all their finances.

The role involves building and maintaining the company’s platforms,

Work with SAP Hybris (SAP Commerce Cloud), Java, Spring Framework, REST APIs, SQL, relational databases, Git, CI/CD, and Agile. Develop and enhance ecommerce platforms for retail clients.

You'll work with C#, .NET, and Angular as a Lead Full Stack Engineer at an ambitious fintech startup. You'll shape technology and architecture, mentor engineers, and drive the engineering team's growth during an exciting expansion phase.

Lead Full Stack Engineer will work with C#, .Net, and Angular. The role is for an ambitious fintech startup entering a growth phase, where they will influence architecture and mentor engineers. The listing does not specify team size.

Java Developer role at Matchtech using Java, Spring Boot, Spring MVC, REST APIs, microservices, SQL, MySQL/PostgreSQL/Oracle, and Git/Bitbucket. The listing focuses on backend or full-stack development requirements but doesn't specify a particular project or team scope.

You will work with Java, Spring Boot, React, Node.js, PostgreSQL, ActiveMQ, and Kafka to build software as part of an agile team. The company operates as a financial services organization.

You'll work with TypeScript, React, Node.js, Python, and Google Cloud/AWS, architecting AI-native systems including LLM-powered workflows and agentic pipelines. Steven.com builds the operating system for the creator economy, powering proprietary AI infrastructure and digital products. This is the most senior individual contributor role, owning architecture for the company's highest-stakes systems.

Mid-level backend engineer role working with TypeScript/JavaScript, gRPC, Vitess, MySQL, CockroachDB, BigQuery, Redis, Google Cloud Platform, Kubernetes, Docker, Terraform, and monitoring tools like Grafana and Prometheus. You'll build Emma's personal finance app, tackling scaling, data processing, and features like overdraft prediction and subscription clustering, working directly with the CTO.

As a founding engineer at this YC-backed AI start-up, you'll work with Python, TypeScript, Java, or Go to build products that solve real customer problems from day one, collaborating directly with founders and users.

Java Developer contract role (12 months, hybrid in London) building and enhancing RESTful APIs, web services, and scalable enterprise applications using Java, Spring Boot, SQL, and Git, with AI-assisted tools like GitHub Copilot or Claude. The client is a large multinational financial services firm providing advisory, investment, and asset management solutions.

You will work with TypeScript, JavaScript, React, React Native, Next.js, Redux, and gRPC to build and enhance Emma's mobile and web apps. Emma is a personal-finance management app that helps millions of people manage all their money.

Build the Guardian Android news app in Kotlin and Java, using Jetpack Compose, Coroutines & Flow, MVVM, WebViews, Jetpack libraries and modular architectures, with CI/CD and testing. As a Staff Engineer on the Apps Experience team, you'll set technical direction and mentor engineers across multiple teams.

You'll work with Python, Vue.js, TypeScript, and AWS, building production systems for AnyVan's logistics optimisation platform. The Allocations team focuses on the data, platforms, and tools that enable transport partners to book and be allocated against the right jobs.

Principal Full Stack Engineer at Verisk, a data/analytics/tech firm for insurers, building cloud-native solutions with TypeScript, JavaScript, Angular, Node.js, Azure/AWS, and microservices; also Swift/Vapor, C#/Java, NoSQL, Docker, and Kubernetes. The role leads architecture and engineering standards across multiple products and teams, mentoring engineers on large-scale distributed systems.

Work with Python, TypeScript, cloud infrastructure, event-driven systems, third-party integrations, Kubernetes, and asynchronous Python to build autonomous voice agents for trades and field-services businesses. As a staff-level product engineer, you will shape technical foundations, own customer problems end-to-end, and raise engineering standards within a growing 14-person team.

You'll work with TypeScript, React.js, Node.js, PostgreSQL, AWS, Terraform, Tailwind CSS, Framer Motion, and Radix UI. You'll build and ship new user-facing features, create AI-powered workflows using LLMs, and develop real-time collaboration features for an AI startup's product.

Develop, maintain, and scale the user portal using JavaScript, TypeScript, React, HTML5, CSS, and REST APIs. The team builds the primary customer interface for an AI security product. No team size is specified.

JPMorgan★3.9 (20k)· London

Java/Springboot, Kotlin, DynamoDB, Aurora/MySQL, AWS, Kubernetes, and Kafka drive the event-driven microservices architecture. The team builds and maintains integrations with digital asset providers and infrastructure (on/off ramp) for J.P. Morgan Personal Investing’s mobile and web apps.

You will work with JavaScript, React, Python, Django, Wagtail, PostgreSQL, Docker, RESTful APIs, Git, and WCAG 2.2 AA standards. You will join a small internal engineering team within a national public body that provides free legal advice, building an in-house capability and contributing to digital services used by over a million people. The development approach is AI-first, with coding assistants integrated into daily workflows.