Glasswall★0.0· London

You'll work with C++, C#, Python, Assembly, and tools like static/dynamic analyzers, debuggers, disassemblers, detonation chambers, and agentic AI. As a Senior Security Researcher on a small team, you'll investigate threats to Glasswall's Content Disarm and Reconstruction technology through vulnerability research, penetration testing, and malware analysis.

You'll work with AWS CDK, Kubernetes on EKS, CircleCI/GitHub Actions, Lambda, ECS, Redshift, RDS, Kafka, Flink, Redis/Valkey, Datadog, and TypeScript/Python/Bash. The Platform Engineering team builds the tooling, automation, and infrastructure that development teams use to build, deploy, and run software on Sparta's commodity trading platform.

You will design, develop, and productionise optimisation algorithms and decision-support tools using Python, Java, and/or Rust, employing MILP, metaheuristics, stochastic programming, or reinforcement learning. The role involves building cloud-deployed CI/CD, containerised, and orchestrated solutions for transportation, logistics, workforce scheduling, and media planning as part of cross-functional product squads. You will act as a senior technical lead, mentoring peers and driving engineering standards.

PlayStation★3.8 (164)· London

Design, build, and optimize data ingestion, transformation, and enrichment pipelines using SQL, Snowflake, Python, and REST APIs. You will join the Security Data Analytics team at PlayStation, developing data products and pipelines that help Information Security teams understand security posture and risk trends. This is an individual contributor role; no team size is stated.

Luxoft★4.5 (669)· London

Lead the architecture of production-grade LLM orchestration and multi-agent systems using LangGraph or LangChain, working with Python (asyncio, FastAPI), TypeScript (Next.js/React), AWS (ECS Fargate, Lambda, SQS, Aurora, Neptune), and AWS CDK or Terraform. The team is developing an Agentic AI solution to generate investment insights from sales and research materials for client meetings.

Sumitomo Group★3.7 (463)· London

Work with SQL Server, Azure, Python, C#/.NET, JavaScript, Alteryx, Microsoft Fabric, PowerBI and DealCloud. Build backend databases, ML models and front‑end tools for the Private Markets team’s European LBO direct lending and private credit vehicles. The Data and Analytics team is adding its third key member to lead data‑platform engineering.

NatWest Group★3.7 (1.2k)· London

You will work with GitLab, Artifactory, Ansible Automation Platform, Kubernetes, ArgoCD/Flux, and cloud-native technologies. You will lead the Engineering Platforms team delivering modern software development tools for over 25,000 engineers across the bank, shaping the CI/CD strategy, observability stack, and automation frameworks.

You will work with ReactJS, NodeJS, MongoDB, and AWS. The team builds a web-based SaaS platform for private equity, venture capital, and alternative investment firms to manage investing, fundraising, and operations. This senior role includes leading and mentoring junior engineers.

KPMG★3.8 (9.9k)· London

Develop web applications using C#, ASP.NET Core, TypeScript, React or Angular, and deploy on Azure Kubernetes Service with containers. You'll work on modernising tax and legal services for KPMG, building cloud-first microservices and client-facing portals for a team of 300+ technologists.

Lead Java Developer (Contract) role using Java 17+, Spring, Spring Boot, Azure, containerisation, serverless tech, Terraform, and Python. Building enterprise-quality optimisation and ML solutions for field operations. Leading development, API design, and tech decisions.

WPP★3.7 (378)· London

Lead Java Developer role at WPP's Satalia building a new logistics optimization platform using Java 17+, Spring, Spring Boot, Azure, serverless and containerized tech, Terraform, and some Python, with API design and tech selection duties. The team develops optimization and ML-based enterprise solutions, and the role leads a development team.

NatWest Group★3.7 (1.2k)· London

You'll work with JavaScript, ReactJS, AngularJS, Python, Java, AWS, GitLab, Google Cloud Platform, Kafka, Hadoop, PostgreSQL, and Snowflake. The Engineering Platforms team delivers a modern software development toolchain for engineers across the bank, and you'll design, produce, test, and implement working software.

Microsoft★4.2 (9k)· London

You'll work with languages including C, C++, C#, Java, JavaScript, or Python and cloud AI platforms (Azure ML, OpenAI) to build production-ready systems. As a Forward Deployed Engineer, you'll embed with UK Defence and Intelligence customer teams, solving their toughest challenges with a security-first mindset.

You will build Microsoft 365, Azure, and AI-enabled solutions using SharePoint Online, TypeScript/SPFx, Microsoft Graph, PnP PowerShell, Azure Functions, Logic Apps, Azure OpenAI, .NET/C#, and Terraform/Bicep, with Azure DevOps/GitHub. Advania UK is a Microsoft partner delivering transformational IT services to clients.

Work with Kotlin, Java, Python, TypeScript, Kafka, Flink, Redis, and clustered Postgres on AWS/GCP to design, build, and maintain backend services for a real-time, data-driven commodity trading platform. You will own features end-to-end, optimizing pipelines for low latency and high throughput.

You’ll work with Kotlin, Java, Python, TypeScript, AWS (Lambda, ECS, EKS), Kubernetes, Kafka, Flink, Redis/Valkey, RDS, Redshift, and infrastructure as code (AWS CDK, Terraform, CloudFormation). As a Backend/SRE Engineer on the Platform Engineering team, you’ll split time between building distributed services for real-time commodity market data and ensuring those systems are observable, resilient, and cost-efficient.

SBS★4.2 (6)· London

You'll work with AWS, Docker, Kubernetes, and CI/CD pipelines, using IaC, scripting languages like Python/Go, and monitoring/logging tools. You will build and maintain cloud/container infrastructure and automation for SBS’s Digital Engagement products (web, mobile, banking capabilities) and its AI Platform, supporting reliability and scalability in a regulated industry. This is a hands-on role collaborating with product engineering, AI, and platform teams.

You'll build the UK's home decarbonisation platform using TypeScript, React, Node, Prisma, and tackle heat-loss physics, geospatial analysis, LiDAR 3D models, and offline-first PWAs. You join a 13-person engineering team, taking technical ownership as a senior IC transitioning into a lead role or a deeply technical existing lead.

You'll work daily with TypeScript and optionally Elasticsearch. The company builds an AI-powered platform for charities and

You’ll build behavioral simulation services with Python, FastAPI, and TypeScript on GCP, owning systems from design to deployment. Electric Twin creates digital twins of populations to predict human behavior, used by organizations like The Times. You'll join a team of 17 shaping the product and engineering culture.

Lead Software Engineer role building autonomous and AI-driven systems for national security at a London defence AI start-up. Work involves Python, Java, C++, Rust, Go, TypeScript, and scalable distributed systems, with hands-on architecture and mentoring. The engineering team is small and high-calibre.

You'll architect scalable Node.js/TypeScript services, integrate LLMs, and work with microservices, event-driven architecture, PostgreSQL, message queues, and cloud infrastructure. The team builds Felicity, an AI

Engineering Manager role leading a team of 5 full stack developers at a music SaaS company, guiding products for enterprise clients. You'll use React, TypeScript, and Python while handling technical discovery, architecture, and systems designholistic. Acting as the first technical contact for enterprise customers and mentoring the team.