Lovable★4.0 (43)· London

Uses Go, Rust, TypeScript; AWS, Azure, Google Cloud, Cloudflare; Kubernetes, Terraform, Temporal, OTEL, CI/CD; PostgreSQL, ClickHouse, Firestore, Spanner, BigQuery. Builds the platform for Lovable Enterprise enabling secure, cloud-agnostic deployment, defining architecture for sandboxing, networking, encryption, identity, and mentoring engineers.

Lovable★4.0 (43)· London

Build enterprise deployments using Go, Rust, and TypeScript on AWS, Azure, and Google Cloud, with Kubernetes, Terraform, and Temporal. You will build the platform that allows large customers to run Lovable securely and at scale across every major cloud provider.

TypeScript, Node, React, AWS, Kubernetes, GitHub Actions, Terraform, and Grafana. You'll own Minut's guest experience surface—messaging flows, guest app, and integrations that turn sensor events into delightful guest experiences. The team is 20+ engineers across product, platform, mobile, firmware, and ML.

Mimecast★3.5 (31)· London

Build and maintain full-stack features using C# (.NET) and Java for backend services, React for user interfaces, and a cloud-native stack including AWS (SQS, S3, Bedrock), PostgreSQL, Elasticsearch, Kubernetes, and Grafana. Join a product engineering squad within the Governance, Compliance & Insights pillar that delivers enterprise-scale compliance and archiving for collaboration and email data from platforms like Slack and Microsoft Teams.

Mimecast★3.5 (31)· London

Build and maintain full-stack features using Java, C# (.NET), React, AWS (SQS, S3, Bedrock), PostgreSQL, Elasticsearch, Kubernetes, and Grafana. You will join a product engineering squad within the Governance, Compliance & Insights pillar, building services that help enterprise customers govern and archive collaboration and email data from platforms like Slack and Microsoft Teams.

You will use C#, React, Oracle, Couchbase, Kafka/ActiveMQ/AmazonMQ, Prometheus, Grafana, CloudWatch, and Concourse to build and maintain end-to-end features, scalable APIs, and microservices for broadcast and video workflow solutions.

You'll set technical direction for a squad modernising a billing pipeline using TypeScript, Node.js, NestJS, PHP 8.x, Symfony, RabbitMQ, Kafka, SQS, PostgreSQL, GitLab CI/CD, and Grafana. The Interstellar Squad owns the mission-critical, event-driven billing run for Wireless Logic’s IoT connectivity platform.

JPMorgan★3.9 (20k)· London

You will build the next generation global-scale core banking platform using Go, Python, and/or Java, Kubernetes, Terraform, and cloud-native technologies, developing microservices, integrations, dashboards, and CI/CD pipelines. You will work on the Global Banking Platform team at JPMorgan Chase, with an initial secondment to a FinTech partner.

You'll work with Playwright, Cypress, Selenium, Postman, Insomnia, React, React Native, Maestro, BrowserStack, Percy, k6, Gatling, GCP, Grafana, LogRocket and AI-assisted testing tools. You'll join Nando's USA Technology team building digital products powering customer journeys (Locate, Menu, Payments, Orders, Loyalty, Identity) across web and mobile to support US expansion.

You will work with C#, .NET, AWS (EC2, RDS, Lambda, S3), SQL Server, PostgreSQL, xUnit, GitHub, TeamCity, and Octopus Deploy. As a senior engineer at a UK insurance broker, you will drive TDD adoption and build an agentic AI development workflow. This is not a management role.

You'll work primarily with NodeJS, TypeScript, React, AWS, Kubernetes, Postgres, and Terraform to build and optimize high-throughput backend services for Bauer Media's advertising platform, where clients bid for space, control graphics, and view performance data in real time. You'll mentor junior and mid-level engineers while focusing on system performance, scalability, observability, and reliability as the platform replaces its legacy system.

Cosine is a UK frontier AI lab building autonomous software engineering models and agents. As a Full Stack Product Engineer, you'll work with React, TypeScript, Node.js, Python, Docker, Kubernetes, and GCP to build web applications and CLIs that expose the platform's AI capabilities to developers, collaborating across research, engineering, and product teams to translate emerging model features into intuitive workflows.

Build and evolve customer-facing and internal web applications using Next.js, React, TypeScript and GraphQL. The Web Engineering team powers customer acquisition, servicing and internal tools at Zopa, working closely with Product, Design, Marketing and Backend teams.

Build and enhance customer-facing and internal web applications using Next.js, React, TypeScript, and GraphQL. The Web Engineering team creates the web experiences powering customer acquisition, servicing, and internal tools at Zopa.

TP ICAP★3.1 (34)· London

You will work with C#, TypeScript, React, SQL, RESTful APIs, AWS, Docker/Kubernetes, GitLab CI/CD, and microservices to design and maintain full-stack applications. The team builds scalable applications powering critical business functions within TP ICAP, a global interdealer broker providing market infrastructure and data solutions.

You'll work with Python (FastAPI), Go, TypeScript, PostgreSQL, Redis, Pinecone/pgvector, AWS (ECS, Lambda, SQS), Docker, Kubernetes, Terraform, LangChain/LlamaIndex, vLLM, and Anthropic/OpenAI APIs. You'll build and optimize RAG pipelines, real-time inference APIs, and vector search infrastructure powering LLM features for 500k+ monthly active users.

Python, FastAPI, Flask, Django, Docker, GitHub Actions, and ML deployment are used in this Senior Software Engineer backend role. The AI engineering team builds technology with measurable real-world impact on how large-scale infrastructure is designed and built.

Proton★5.0 (1)· London

You will work daily with C#, TypeScript, and Rust, also providing bindings for Swift and Kotlin, using tools like Grafana, Prometheus, Sentry, GitLab CI, and Playwright. The Drive Foundation team builds the SDK that powers Proton Drive, ensuring cross‑client consistency and serving as the backbone for the encrypted cloud storage service.

Citi★3.9 (21k)· London

You will work with Java, Angular, microservices, event-driven architectures (Kafka, RabbitMQ), Spring Boot, Docker, Kubernetes, and AI frameworks (Python, LangChain). At Citi, a global financial services firm, you will design and deploy AI-enabled full-stack applications, integrating agentic AI to solve complex business challenges.

You will use C#, TypeScript, ReactJS, RESTful APIs, AWS or GCP, SQL, and event-driven systems to develop the Paloma Portal — an AI-powered patient pathway and Electronic Patient Record (EPR) for NHS children’s autism and ADHD assessments. Your work will also involve leveraging AI tools like Claude Code for automated processes and intelligent automation.

Proton★5.0 (1)· London

Join Proton's Inbox Desktop team to rebuild the Proton Mail Desktop App, Mail Bridge and Export tool using a cross-platform Rust stack. You'll work with Golang, C++, Qt, JS, TypeScript, React, Electron and standard dev tools (Git, GitLab CI, Jira). You’ll take technical ownership of the Windows and Linux desktop clients within a cross-functional team of about 60 engineers.

Proton★5.0 (1)· London

As a Senior Front End Engineer on the Standard Notes team, you will work with JavaScript, TypeScript, React, ES6, Playwright, Jest, and Grafana. The team builds a secure note-taking and productivity platform, developing features like encrypted search and cross-platform sync using end-to-end encryption. All Standard Notes codebases are open source.

Senior UI Platform Engineer role at Jain Global using React, TypeScript, Vite, Next.js, Ant Design, AG Grid, Datadog, OpenTelemetry, Grafana, Microsoft Entra ID/Azure AD, and npm packages. The Core Platform team builds reusable frontend foundations—shared UI packages, application scaffolding, authentication/authorization integration, developer tooling, and internal platform applications (onboarding, access, service discovery).

You'll work primarily with React and TypeScript on the frontend, and Python (FastAPI/Flask) on the backend, using tools like Storybook. The Monolith AI Engineering Team builds the core platform for engineering simulation and AI workflows, aiming to become a super-intelligent AI test lab for the engineering industry.

Build and ship Python services using FastAPI, SQLAlchemy, OpenTelemetry, Procrastinate, PostgreSQL, Liquibase, Docker, and AWS to automate finance and operations workflows — including reconciliations, reporting, and payments — for a UK consumer lending fintech. This is a hands-on engineering role on a small, high-impact team.