You'll work across the stack building core systems from scratch using Python, C#, Go, or Java, with direct collaboration with founders on product and technical strategy. This role is at an early-stage cybersecurity start-up focused on transforming how organizations secure data and infrastructure.

You will work with TypeScript, React, Node.js, Python, and Google Cloud/AWS, building LLM-powered workflows, intelligent pipelines, and agentic systems. As the most senior individual contributor at Steven.com, you own the architecture of the company’s highest-stakes, complex systems for its creator-economy operating system. This founding-team role sets the technical bar for the whole engineering organization.

Senior Software Engineer role at Bauer Media Outdoor, working with React, Next.js, TypeScript, Node.js, Python, serverless architectures, Postgres, DynamoDB, AWS (Lambda, CloudWatch, API Gateway, S3), and Terraform. The engineer will build ad tech and programmatic buying platforms for outdoor advertising, guide system design, and mentor engineers.

You'll work with Python, TypeScript, React, AWS, and DevOps tools to build scalable software for Abtrace's primary-care platform, which helps 500+ UK practices proactively manage care for 4.5M patients. You'll own technical planning and delivery in a cross-functional squad.

You'll work with TypeScript, React, Node.js, Python, JavaScript, SQL/NoSQL databases, and AI/ML tools including LLM-based APIs. Steven.com builds an operating system for the creator economy, and you'll ship end-to-end features across internal and external products.

You'll work with Python, SQL, Linux, Docker, and legacy systems, plus desirable tools like dbt, Snowflake, Kafka, AWS, and Java. You'll develop ELT pipelines, build a streaming platform for tick data, and consolidate legacy systems for Aspect Capital, a London-based systematic hedge fund. This is a lean team owning end-to-end delivery of data ingestion and transformation.

You'll work with TypeScript, Python, and/or Rust/C++, plus cloud infrastructure and SQL/no-SQL databases. Catapult builds personalised AI models that understand your work context across email, calendar, Slack, and more. The role includes building desktop apps end-to-end and algorithmic development.

You'll work with TypeScript, React, Next.js, Node.js, Express, and PostgreSQL. The team builds financial products for African businesses, including automated payouts, payment automation, and invoice processing. You'll join a small, high-performing team shaping the product vision and technical architecture.

You'll work with TypeScript, React, NextJS, PostgreSQL, and Claude Code (or similar AI agents) to build greenfield AI products using LLMs. These tools process and extract insights from international filings, regulatory documents, and research materials for investors.

You'll build Voop's full-stack platform using TypeScript, React/React Native, Kotlin Multiplatform, Hono, Postgres, Pulumi/SST, Docker, AWS, and Kamailio. Voop creates a safe mobile network with device-integrated safeguarding and AI-driven risk detection, with its first product live protecting UK children. You'll ship production code across web, mobile, and backend services.

Staff Full Stack Engineer at Capi, working with Typescript, React, NextJS, NodeJS, Express, and PostgreSQL. The role involves building and scaling a platform for African businesses, contributing end-to-end from UI to backend logic, and working closely with the founding team in London and Paris.

Build features using Java, Python, and MATLAB, integrating with proprietary trading systems and strategic SaaS providers while applying TDD, CI/CD, and monitoring. You will join the Software Development team at Aspect Capital, an award-winning systematic hedge fund managing over $8 billion in assets.

You'll work with Java 21, Spring Boot 3, event-driven microservices on AWS (EC2, RDS, SQS, SNS, SES, Cognito), PostgreSQL, Docker, and GitHub Actions CI/CD, using AI tools like Claude Code. Aslan builds the back-end systems that power payroll and payments for companies and their employees.

You'll use Go, gRPC, HTTP, Docker, and observability tools like Prometheus and Grafana on a modern containerised AWS stack with MySQL, DynamoDB, Redis, and Elasticsearch. The backend team designs, builds, and supports high-traffic APIs and internal tools for a community safety platform, processing tens of millions of analytic events daily with event-driven architecture and machine learning.

Manage core applications (Aptem, Monday.com, CRM, LMS or similar), working with APIs, low/no-code automation tools, and workflow platforms. The role owns application strategy, configuration, integration, and vendor management at Corndel, a UK training provider delivering leadership and technology programmes. You will lead system optimisation and support transformation across the business.

Tech Lead role at a boutique financial services consultancy building digital banking solutions. Leads a team of engineers using Java, Kotlin, Python, JavaScript/TypeScript, Spring, and Node.js, with hands-on coding, system architecture, and cloud-based applications.

You will work with SailPoint IdentityIQ, Java, Active Directory, Azure AD, LDAP, Workday, Fieldglass, SAML, OAuth, and SCIM. You will join AIG’s Identity and Access Management team, designing and maintaining enterprise IAM infrastructure for the global insurance company. No team size is stated.

Fitch Group★4.5 (4)· London

Service Reliability Engineers embed with Fitch Ratings development squads, using AWS, Azure, Kubernetes, Docker, GitHub Actions, Datadog, and AWS Bedrock/SageMaker. They drive reliability, observability, and AI-enabled operations for mission-critical services, focusing on new AI development and cloud infrastructure automation.

You'll work with AWS, AWS CDK, Kubernetes/EKS, Lambda, ECS, CircleCI, GitHub Actions, Redshift, RDS, Kafka, Flink, Redis/Valkey, Datadog, and scripting languages like TypeScript, Python, or Bash. Sparta is a commodity trading platform; its Platform Engineering team owns the tooling, automation, and infrastructure that developer teams use to build, deploy, and run software.

You will work with Go, Rust, Python, Java, C++, headless browsers (Chrome DevTools Protocol, Playwright, Puppeteer), proxy systems, and distributed systems. The team builds infrastructure for massive web data acquisition and operates a distributed crawler via the Grass bandwidth-sharing network, powering dataset creation for AI model training.

Work with Python, Java, or C++, and AI frameworks like TensorFlow, Keras, or PyTorch to develop and implement AI models and algorithms. You will solve real-world problems, integrate AI into existing systems, and research performance enhancements for cutting-edge AI applications at Demo Co.

You will work with Oracle (Exadata Cloud, Autonomous, 11g/12c/18/19c, RAC, ASM, Data Guard), PL/SQL, Python, Bash/KSH, Ansible, Java, Oracle APEX, Git/Stash, JIRA, RMAN, and data pump. The Global Database Engineering Team manages Deutsche Bank’s relational database platform and builds automation to keep business systems operational.

You'll work with GitLab, Artifactory, Ansible Automation Platform, Kubernetes, ArgoCD/Flux, and cloud-native technologies. As a Principal Engineer in the Engineering Platforms team, you’ll deliver a modern software development toolchain for over 25,000 colleagues across the bank, coordinating multiple feature teams and defining architecture for end-to-end automation and scalability.

This role involves building data pipelines, Snowflake data models, and automation using SQL, Python, Java, or R, with practices like version control and CI. The engineer joins Sony Interactive Entertainment's Security Data Analytics team, supporting Information Security with analytics-ready data and AI-enabled workflows.

You will work with Kotlin, Java, Python, or TypeScript on AWS (Lambda, ECS, EKS), using AWS CDK, Terraform, Kubernetes, Datadog, Kafka, Flink, Redis/Valkey, RDS, and Redshift. This role is a 50/50 backend and reliability engineering split on Sparta’s commodity trading platform, building distributed services for real-time market data and owning production observability and resilience.