JPMorgan★3.9 (20k)· London

Work with KDB, Q, AWS, and optionally Terraform, Kubernetes, Python, C, C++, or Java. Develop and maintain applications storing large Options data sets for real-time and historical access within JPMorgan’s Equities Trading Data & Analytics team, migrating to AWS and re-architecting systems.

Lovable★4.0 (43)· London

As the first data scientist in Lovable's new London growth team, you'll own the growth funnel end-to-end and work directly with growth engineers to ship experiments. You'll use SQL, Python, BigQuery, PubSub, Hex, and A/B testing on GCP, building the metrics and systems that drive acquisition, activation, retention, and expansion.

Post-train, fine-tune, and distil frontier language models using RL, distillation, and reward design in Python. Build production-grade simulation systems that model thousands of individuals in real-time for a Societal World Model at a YC-backed startup.

You’ll work with Python, FastAPI, TypeScript, React, and GCP. Electric Twin builds a behavioral simulation platform that creates “digital twins” of real populations, helping organizations test decisions with 95% accuracy.

You'll work with Python (FastAPI/Django), Svelte/TypeScript, and AWS to build features across a payments and discovery platform. Tab is a YC-backed travel fintech enabling 100,000+ global tourism businesses to accept payments in 100+ currencies.

Build and scale distributed infrastructure on AWS using Pulumi for high-performance AI model inference. Develop end-to-end features across TypeScript/React frontends and Python-based agents for automating complex workflows in aerospace and healthcare.

You will build and optimize multi-agent AI systems using Python and LLM orchestration tools like Temporal or LangChain, plus observability and data pipelines. Tuza is a London fintech creating AI agents that automate manual banking workflows for partners like Worldpay and NatWest.

You will work with C#, Python, TypeScript, JavaScript, React Native, AWS or Azure, and various databases (relational, graph, document, key-value) plus SQL. The role supports critical projects aligned with Net Zero ambitions.

You will work with Java, Spring Boot, microservices, REST APIs, AWS, DevOps and CI/CD pipelines. You’ll lead client projects for a global technology consultancy, mainly in financial services, focusing on migrating legacy systems to AWS and introducing cloud deployments. As Principal Java Developer, you will lead projects, but team size isn’t specified.

Build UI components using Vue.js, React, or Angular, plus JavaScript, HTML/CSS, and Figma. You'll join TransPerfect TechOps, which develops workflow improvements, core services for the GlobalLink platform, and scalable client interfaces. Work within an Agile (SCRUM/Kanban) team.

NatWest Group★3.7 (1.2k)· London

Leading a team building cloud-hosted, event-driven microservices at NatWest Boxed, you will manage software and quality engineers across empowered squads while working with AWS, Google Cloud Platform, Java, Python, JavaScript, ReactJS, AngularJS, Kafka, Hadoop, PostgreSQL, Snowflake, and GitLab.

SS&C★3.2 (1.7k)· London

Design, develop, and maintain automated test suites using C#, BDD frameworks (SpecFlow/Reqnroll), GitHub Actions, Playwright, and Selenium WebDriver. You will integrate AI-powered tools like Claude Code and GitHub Copilot to accelerate testing across Calastone's financial products, a global funds network.

Atlassian★3.9 (61)· London

Leads a team of forward-deployed engineers building AI-powered solutions with Python, JavaScript, APIs, microservices, and LLMs. The team partners directly with top organizations to apply Atlassian’s AI capabilities to solve real-world problems.

You’ll work with JavaScript, TypeScript, React, Next.js, Node.js, Python, WebGL, Three.js, Unity, Unreal Engine, TouchDesigner, LLMs, AI agents, ComfyUI, vector databases, AWS/GCP/Azure, and Figma. At WPP Production, a global content production company, you’ll rapidly prototype and scale interactive digital experiences, bridging software engineering and creative design. You will line-manage and mentor mid-level and junior developers.

Verisk★3.5 (361)· London

Use TypeScript, JavaScript, Angular, Node.js, Azure or AWS, and microservices to design and build large-scale, cloud-native software solutions for Verisk’s insurance analytics platforms. You will shape technical architecture across multiple products and teams.

You'll work with Python, Go, React, TypeScript, Docker, Kubernetes, APIs, model-serving systems and distributed-inference workloads. Partnering directly with customers, you'll architect, build and deploy production AI/ML systems on Lightning's end-to-end platform, covering inference infrastructure, distributed systems and AI workflows.

Backend engineer designing and evolving Python microservices with Django/DRF, FastAPI, Postgres, Redis, Celery/RQ, RabbitMQ/SQS, Docker, K8s/ECS, AWS, and OpenTelemetry/Grafana. You will refactor and build scalable systems for AI and CV workloads that help patients and clinics diagnose and plan physical appearance improvements. You will also triage production bugs, mentor teammates, and contribute to architectural roadmaps.

You will work across the full stack using Kotlin, TypeScript, Python, Rust, React, Postgres, DynamoDB, Kafka, ECS, EKS, Lambda, and AWS CDK. Natter builds an AI-powered conversational platform that lets thousands of users share feedback through real-time video conversations. You will own features end-to-end with a small engineering team.

Software engineer role at UnderwriteMe, an Insurtech company building underwriting decision engines and insurance marketplaces. The role involves Java, Kotlin, Spring Boot, AWS, cloud-native development, and CI/CD, owning the full software lifecycle. Engineers lead technical initiatives, mentor peers, and collaborate with product managers.

NatWest Group★3.7 (1.2k)· London

Back End Engineer at NatWest Group's NatWest Boxed, working with Java, Spring Boot/Micronaut, Kubernetes/Docker, AWS, and Kafka/event sourcing. You'll build the NatWest Boxed technology product on cross-functional mission teams, develop reusable code, and support junior engineers as a subject matter expert.

Tesco★3.5 (25k)· London

Work with .NET/C#, Java, Cassandra, Docker, HAProxy, Azure DevOps, and TDD. The payments service team delivers HTTP services managing payments at global scale for Tesco, handling 100M+ transactions daily. You'll also mentor and develop others.

Java, RESTful APIs, PostgreSQL/Oracle DB, Kubernetes, AWS, and SQL. The role involves building and maintaining microservices, APIs, and databases; writing unit tests; deploying on Kubernetes; and setting up monitoring.

Work with React, Node.js, ThreeJS/WebGL, and SASS, plus WebAR (8th Wall), Unreal, Blender, and AI frameworks like TensorFlow. As part of Powster (Vista Group’s creative studio), you lead the full development lifecycle of immersive WebGL websites and AR experiences for major movie, music, and streaming clients.

You'll own the core frontend using React, TypeScript, and Storybook, shipping multiple times daily. The company builds the control plane for data and AI workflows used by leading enterprises. You'll join a small, generalist engineering team with room to expand into backend and infrastructure.

Work with gRPC, REST, Kubernetes, Docker, Python, and Rust across diverse stacks. Bending Spoons acquires and improves digital businesses, operating them long-term with small, talent-dense teams. Integrate AI tools into your development workflow.