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 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.

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.

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'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'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.

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.

You will work with ReactJS, NodeJS, MongoDB, AWS, HTML/CSS/LESS/SASS, and Git/CICD. Atominvest builds software that powers private equity, venture capital, and hedge funds to manage investing, fundraising, and operations. You will help mentor junior team members, though the team size is not specified.

You’ll build cloud-first web apps using C#/ASP.NET Core, TypeScript/React/Angular/Blazor, REST APIs, microservices, and messaging (Service Bus/Kafka), deploying via Azure Kubernetes Service, Docker, and DevOps tools like Git, Jenkins, and Azure DevOps. You’ll join the Tax & Legal Technology team—300+ technologists—working on tax and legal software, client portals, and generative AI initiatives in small agile engineering teams.

You will work with Kotlin, Java, Python, TypeScript, AWS/GCP, Kafka, Flink, Redis, and clustered Postgres, using agent-based tools like Claude Code. As a backend engineer on Sparta’s next-generation commodity trading platform, you’ll design and maintain services for real-time and analytical data processing, optimizing for low latency and high throughput.

GUARDIAN NEWS & MEDIA★4.6 (7)· London

Staff Android Developer role building the Guardian Android app in Kotlin and Java, using Jetpack Compose, Coroutines & Flow, MVVM, WebViews, and modular architectures. You'll lead technical direction, influence architecture, and mentor engineers across multiple teams for an app with over 5 million downloads.

Lead AI Software Engineer working hands-on with Java, Spring Boot, React or Angular, RESTful APIs, microservices, Kafka, RabbitMQ, and cloud-native architectures. The role leads software implementation and engineering delivery across squads for VOIS, Vodafone’s strategic arm creating intelligent solutions.

Work with Java, Python, JavaScript, ReactJS, AngularJS, AWS, GitLab, Google Cloud Platform, Kafka and Hadoop. You will join the Engineering Platforms team delivering a modern software development toolchain for engineers across the bank.

Build high-performance front ends using React, TypeScript, JavaScript, React Hooks, and ES6/ES7 within a leading HFT firm's trading environment.

You will work with Java, microservices, REST APIs, event-driven architectures, AWS (Lambda, EKS, RDS, S3, MSK), containerization, CI/CD, TDD, and AI tools like GitHub Copilot and LLMs. This role builds next-generation trading and cash management systems for PIMCO's Short Term, Cash, and Collateral desks, modernizing platforms and migrating to cloud-native AWS services.

You will work with Java 11+, Spring Boot, microservices, event-driven architecture, cloud platforms (Azure, AWS, GCP), Terraform, CI/CD (Azure DevOps, GitHub, Jenkins), and AI development tools. The team builds post-trade technology solutions, APIs, client reporting platforms, and customises trading systems for capital markets.

Build and lead development of high-performance Java applications for FX risk management, using AI tools (GitHub Copilot, Devin.AI, Citi Squad, Stylus Workspaces with Gemini/OpenAI/Claude/Llama) and modern DevOps (Docker, Kubernetes, OpenShift, CI/CD). The greenfield platform is 3 years in production with a 10+ year strategic commitment.

Lead Engineer role using React or similar component-oriented front-end frameworks, TypeScript, Azure, and CI/CD pipelines. The digital team builds customer-facing retirement, investment, and protection products for Canada Life UK. You will set UI/UX and accessibility standards across a cross-functional product team.

Senior UI Software Engineer building high-quality trading GUIs for Citi's FX pricing platform. Work with TypeScript, React, HTML5, CSS, JavaScript (ES6+), Chromium/Electron/OpenFin, FDC3, REST/WebSocket APIs, Kafka/Solace/Tibco, and CI/CD (Jenkins). Provides technical leadership, driving AI integration and performance engineering across globally distributed teams.

You will work with Java, Spring Boot, React, TypeScript, Node.js, Kotlin, microservices, and testing tools like Jest and Cypress. As part of Citi’s Finance Technology team, you will lead the re-platform of applications supporting Finance, Risk, and Controllers.

You will use Java, Spring Boot, RESTful APIs, microservices, SQL, and AI development tools like GitHub Copilot or Claude, with Angular, TypeScript, HTML, and CSS desirable. The team builds large-scale enterprise applications for a global financial services organization.

Senior Full Stack Kotlin Developer working with Kotlin, Java, Spring Boot, microservices, REST APIs, Node.js, TypeScript and cloud-native tools (AWS/Azure/GCP, Docker, Kubernetes, Terraform, CI/CD). You will build secure, scalable digital services for large-scale public sector and healthcare digital transformation programmes within Agile, multidisciplinary teams.