You will build scalable server-side logic using JavaScript, TypeScript, and Node.js in a microservices architecture on AWS with Kubernetes, Terraform, Kafka, and Snowflake. You will join the MMH team within the Martech domain, which orchestrates campaign delivery across email, push notifications, and personalised content for all Sainsbury’s Group brands. The team includes 7 engineers.

You will work with backend development, databases, APIs, cloud services and production machine learning systems. This is for a growing technology business. No specific project or team size is mentioned.

Java back-end developer using microservices, REST APIs, AWS (Lambda, EKS, RDS, S3, MSK), CI/CD, and AI tools (GitHub Copilot, LLMs). Builds next-gen trading and cash management systems for the Short-Term, Cash, and Collateral desks, modernizing platforms and migrating to AWS.

You'll work with TypeScript, Node.js, AWS serverless technologies (Lambda, SQS, EventBridge, API Gateway), MongoDB, Terraform, and GitHub Actions. Seccl is an embedded investment platform helping people invest better, owned by Octopus. You'll design and operate services within cross-functional squads, mentor engineers, and support regulated investment operations in a build-and-run model.

JPMorgan★3.9 (20k)· London

You will work with Python, AWS, EKS, Docker, Kubernetes, Kafka, and MLOps tools. As a member of the Applied AI/ML Software Engineering team within CIB Security Services Technology, you will build cloud-based frameworks for hosting machine learning models alongside Data Scientists to integrate AIML solutions into production systems.

Flock★4.0 (6)· London

You'll write production TypeScript on AWS serverless (Lambda, API Gateway, SQS, EventBridge, DynamoDB, S3, CloudWatch) with Terraform/CDK and AI coding agents. As Engineering Lead for the Acquisition team, you'll co-lead with a PM to build features that help fleets find and choose Flock, the connected-vehicle insurer.

JavaScript and Vue.js for component-based UIs, Python with FastAPI for Lambda endpoints, PostgreSQL for schema design, and AWS (Lambda, API Gateway, S3). The role involves feature development and redesign of core tools using Vue.js, AWS Lambda, and Aurora PostgreSQL, plus building the backend API layer.

You will work with Python, Django, Django REST Framework, FastAPI, PostgreSQL, AWS, React.js, Docker, Redis, Celery, Pandas, NumPy, Git, Jenkins, Elasticsearch, and Kubernetes, using AI tools like Claude Code and Cursor. You’ll shape the technical direction of a cloud-based property management platform handling payments, quoting, invoicing, booking, search, data pipelines, notifications, and fraud prevention. This is a leadership role bridging product vision and technical execution, guiding engineers toward delivery.

Build scalable backend services and APIs with Go, Python, or C++, and develop frontend applications using React and TypeScript. You will ship AI-powered product features end-to-end on a platform combining computer vision, multimodal AI, and real-time data. Work closely with AI and platform engineers on new capabilities within a small, experienced team.

You'll work with Adobe Creative Suite (Photoshop, Illustrator, InDesign, After Effects, Premiere Pro), Figma, and AI tools like ComfyUI and Midjourney. You'll lead end-to-end creative production for marketing, event, and digital assets at Ultralytics, turning complex vision AI into clear visuals for the company that creates the leading YOLO AI models.

You will use C#/.NET, Vue.js/React, AWS (SQS, DynamoDB, S3, ECS, Lambda), GitHub Actions, and agentic coding tools to build ERP integrations. Your squad owns the in-product workflows Xe runs inside Sage, Business Central, Dynamics 365 F&O, and Xero, plus the accounting orchestration layer behind them. Xe is rebuilding its cross-border payments platform for corporate and consumer clients.

Lead Graphic Designer at Ultralytics (AI/computer vision) will use Adobe Creative Suite (Photoshop, Illustrator, InDesign, After Effects, Premiere Pro), Figma, and AI tools like ComfyUI and Midjourney. They own end-to-end creative production for campaigns, social, web graphics, event branding, and motion content, supporting adoption of Ultralytics YOLO AI models.

You will work with JavaScript, TypeScript, and offensive security tools for penetration testing, reverse engineering, and vulnerability assessments. You join a specialist security team at a global leader in Computer Vision, AI, and biometric identity, acting as the bridge between Security and Engineering to embed security throughout web application development.

You will work with Python, TypeScript, GCP (Cloud Run, Cloud Tasks), multimodal AI, and SVG/vector graphics to build SpecForm OS, an AI platform that transforms garment references into technical drawings, 3D renders, BOMs, and production documents for fashion designers and brands. This is a founding engineer role with high ownership across architecture and full-stack development.

You will own an existing production React/TypeScript application across web, iOS, and Android, integrating with Python/FastAPI backends and managing CI/CD pipelines. The team builds a computer-vision platform that turns video data into actionable insights. You will drive frontend architecture on a small, collaborative engineering team.

DNEG★3.1 (36)· London

Design, build, and maintain high-performance RESTful APIs, microservices, and event-driven architectures using Python, PostgreSQL, and Redis. You will integrate generative AI models (ATMAN, VAANI) into production backends for a company operating at the intersection of enterprise Media Asset Management and generative media.

Apple★4.1 (14k)· London

Use Golang, C++, Java, or Python along with Kubernetes, Cassandra, Zookeeper, Kafka, Redis, and other open-source tools to build and support Apple's next-generation infrastructural platform for iCloud and backend services at hyperscale. The role includes technical leadership of projects or small teams, developing resilient API-driven services.

Work with Angular, Node.js, TypeScript, AWS (Lambda, API Gateway, S3, DynamoDB), RESTful APIs, Tailwind, and CI/CD pipelines to design, build, and maintain web applications for AAT’s strategic goals and customer needs.

Work with Python, Pandas, NumPy, Polars, Flask/FastAPI, and optionally Databricks and AWS. You will build scalable tools for the Risk Division in an energy commodities trading environment, supporting traders and risk analysts by centralising data and improving reporting.

State Street★3.4 (3k)· London

You will work with ReactJS, NextJS, TypeScript, NodeJS, Java, Spring Boot, Docker, and AWS to build cloud-native microservices. The role involves modernizing legacy platforms and developing enterprise-scale applications for a financial services firm. You will also mentor junior developers.

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 design and build Python services and APIs using AWS (Lambda, S3, ECS/EKS, Step Functions, Aurora), Kafka, and PostgreSQL/SQL Server/Snowflake to support portfolio construction, trading, and analytics. This Investment Technology role turns research tools into production-grade platforms for Portfolio Managers and Quantitative Researchers across Equities, Fixed Income, and Alternatives.

TypeScript, React, and AWS services (Lambda, API Gateway, S3, EventBridge, SQS, CloudWatch) drive backend and frontend development. The team builds event-driven systems that expand the platform for global delivery, logistics, and ride-hailing insurance, onboarding new fleets, brokers, and industry sectors.

You will write production C++ and Python for physical robots deployed in real-world environments. You will own core subsystems end-to-end, developing algorithms for SLAM, navigation, computer vision, and high-performance computing at a pre-seed/seed stage 15-person robotics startup.