You will use React, front-end technologies, iOS/Android, Java with Spring Boot, REST APIs, Kafka, IBM MQ, and apply TDD and automated testing within Agile and DevOps practices. As part of a permanent feature team, you will design, produce, and test software for a platform, collaborating with engineers and stakeholders to support business objectives.

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.

Altus Group★3.0 (197)· London

This hands-on Tech Lead role at Altus Group builds AWS-native platforms using Lambda, ECS, RDS, S3, SQS, API Gateway, CloudWatch, Terraform, and CI/CD pipelines, with Python, Java, or Node.js. The lead owns mission-critical services end-to-end, drives architecture, and mentors engineers while partnering

Build trading systems, market data infrastructure, and quantitative research platforms using C++, Python, and Java. The role is with a network of 40+ top trading firms, focusing on trading platforms, risk systems, and data infrastructure for high-frequency trading.

You will work with Python 3.11, PostgreSQL, Django, mypy, GraphQL, Docker, Redis, Typescript, React and Apollo. The team builds a software engine that automatically generates complete circuit board designs from requirements, aiming to automate hardware design. You’ll own back-end development and collaborate with other lead engineers.

This role uses C++, Java, Oracle RDMS, REST APIs, cloud platforms (Azure, AWS, or GCP), Kubernetes/OpenShift, CI/CD tools, DevOps, and monitoring/observability tools. You will work on hospitality solutions such as Central Reservation Systems, Property Management Systems, and Payment systems/gateways.

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'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, 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.

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.

Use SQL, Python, and AI tools to extract and analyze large data sets on private markets and alternative investments. Work with Product and Machine Learning teams to develop data extraction from unstructured text like PDFs. The company automates alternative investment data processes for institutional investors.

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.