You will use Python daily, with Ruby useful but not required, and AI tools like Claude in your workflow. The team focuses on greenfield projects in a start-up or small business environment.

Bloom and Wild★2.6 (5)· London

You will work with AWS, Terraform, Ruby, Python, React, GitHub Actions, and Datadog. The 60+ person Tech team builds software for Bloom & Wild’s direct-to-consumer flower and gifting business, including online shops, warehouses, and delivery logistics. You will split time between embedded work in domain squads and central Platform work building shared tools and automation.

Koinly★3.0 (1)· London

Work with React 19, TypeScript, TanStack (Router, Query, Table), Radix UI, Mantine, Tailwind CSS v4, Vite, Vitest, Storybook, Highcharts, Sentry, Bun, and RabbitMQ on a data platform that reconciles crypto transactions and tax obligations for Koinly’s web application, with a React Native mobile app joining scope later.

Koinly★3.0 (1)· London

You will work with TypeScript on Bun, RabbitMQ, Redis, PostgreSQL, Vitest, Sentry, and Rust. The team owns the distributed data-processing backend that ingests, normalizes, and reconciles on-chain and exchange data for Koinly’s crypto tax calculation product.

Lead engineers use Java, C#/.NET, Python, TypeScript, JavaScript, React, Go, Ruby, Scala, R, and SQL; Git, MacOS/Linux, and CI/CD; and AI-assistive tools. They lead multi-client software consultancy engagements, building and delivering production agentic systems and ML-powered features. The team is typically one to two clients per year.

You will work with Vue, Ruby on Rails, Postgres, Terraform, dbt, AWS, and GCP. EmpowerRD builds software that makes R&D tax relief claims transparent and empowering for businesses and advisors. As Head of Engineering, you own the technology strategy and lead the engineering and data teams.

You'll work with Ruby on Rails, PostgreSQL, Redis, React, TypeScript, and React Native. As a hands-on Director at a HealthTech company, you'll write production code, architect features, and serve as the technical contact for major clients. You'll line-manage 3-5 junior and mid-level engineers.

Full Stack Developer role using Python, TypeScript, AWS, Ruby on Rails, React, Redux, Node, and PostgreSQL. You’ll work on a loan origination and servicing platform for an ethical FinTech that offers small, short-term secured loans to help improve credit ratings.

Work with Ruby on Rails, Go, TypeScript, and Elixir to design, build, and maintain APIs and services, contributing to a monolith and breaking it down toward distributed systems. Gigs builds an operating system for mobile services, enabling tech companies to embed global connectivity into their products.

You'll work with Ruby on Rails 8, Hotwire, Stimulus, PostgreSQL, REST APIs, Stripe, and Next.js to build and enhance a digital learning platform and develop a new product. You'll take full-stack ownership, collaborating with founders and product teams.

The Head of Engineering role oversees a technology stack of Vue, Ruby on Rails, Postgres, Terraform, dbt, AWS, and GCP. You will define the technology strategy and engineering culture for a software platform that simplifies R&D tax credit claims for businesses and advisors. This senior leadership position manages and mentors cross-functional engineering and data teams.

Lead engineering at EmpowerRD, owning the technology strategy for a SaaS platform that simplifies R&D tax relief claims. You will work with Vue, Ruby on Rails, Postgres, Terraform, dbt, AWS, and GCP, managing the engineering and data teams and reporting to the CEO.

Transport for London★4.0 (429)· London

Work with AWS infrastructure administration, IaC (CloudFormation, Puppet, Ruby, Perl), Windows/Linux Server, and Sophos UTM. You will provide Level 2/3 support for TfL's in-house developed online services, including the website, API, and Journey Planner environments, while maintaining CI/CD practices.

8th Light★0.0· London

You will use Java, C#/.NET, Python, TypeScript, JavaScript, React, Go, Ruby, Scala, SQL, Git, CI/CD, and AI-assistive tools. As a lead technologist at a technology consultancy, you will lead client engagements building agentic products, platforms, and full ML lifecycle systems. You will mentor colleagues and lead architecture discussions on complex projects.

8th Light★0.0· London

At 8th Light, a technology consultancy, you'll build production-grade platforms and agentic systems using Java, C#/.NET, Python, TypeScript, JavaScript, React, Go, Ruby, Scala, R, and SQL. You'll lead platform strategy and delivery for multiple clients per year, advising on architecture, scalability, and AI/ML integration.

Full Stack Engineer / Technical Lead role using Ruby, TypeScript, and React. You will own the technical strategy for Developer Ecosystems at a provider of serverless real-time infrastructure powering live chat, VoIP, and real-time pricing. Lead cross-team initiatives, mentor engineers, and manage open-source collaboration.

You will work with Ruby on Rails 8.1, Hotwire, Stimulus, PostgreSQL, RESTful APIs, and Stripe. As the primary developer at Create Academy Ltd., a London-based creative learning platform with over 50 live video courses, you will own the entire codebase and drive technical excellence alongside the CTO.

As a Senior Software Engineer at Syntasso, you'll work primarily with Golang and Kubernetes, as well as other languages like Ruby, Rust, or Python, using XP techniques such as pairing and TDD. You will design, build, and evolve Kratix, the company's open-source platform-engineering framework, and its commercial product, Syntasso Kratix Enterprise, while collaborating closely with a small, expert engineering team and customers.

Work across the stack with React, TypeScript, and Node.js or Golang on privacy-focused systems and architecture that keep users' location data inaccessible. As part of Wheely's small core-engineering team, you'll collaborate with Product Managers, Designers, and Software Engineers to shape solutions from concept through production.

You'll use Python, Ruby, Go, or Java to architect core components of a proprietary AI operating system that acquires B2B SaaS businesses and automates sales, onboarding, and customer success workflows. You will join a small, rapidly scaling engineering team growing from four to ten people.

You will build the core platform in Ruby and Python, designing APIs and data models, and build React interfaces for operational intelligence. This company acquires profitable B2B SaaS businesses and deploys a proprietary AI operating system to automate workflows across them. You'll take end-to-end ownership of features as part of a small engineering team.

Work with Java, Spring Boot, Angular (v15+), Ruby, TypeScript, SQL, REST APIs, and AWS. Re-architect and enhance a real-time shift rotascheduling platform for the NHS, with a 50/50 split between backend and frontend projects. You will help influence best practice as a senior member of a small team.

You will work with Ruby on Rails, PostgreSQL, Redis, Sidekiq, Vue.js, AWS, Docker, GitLab, and Cloudflare. You will take ownership of core product development, platform improvements and technical decision-making for a SaaS platform in the health, fitness and coaching technology sector.

Work with Ruby on Rails, Vue.js, Stripe, AWS, Docker, PostgreSQL, and CI/CD pipelines. The team builds a fitness technology platform that lets coaches, gyms, and fitness brands create and scale digital training programmes.

You will work with Vue.js (Vue 2/3), JavaScript/TypeScript, Vuex/Pinia, REST APIs, and a shared design system. You will build and deliver features for the official personal training software for HYROX, a platform used by coaches and athletes worldwide.