Recann
Senior Full Stack Engineer
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Senior Full Stack Engineer. Fit-Tech SaaS
Salary: £65,000 to £75,000
Location: Remote, United Kingdom
Working hours: 9:00am to 5:30pm
Reporting to: CTO
Hiring: Two permanent positions
Target start: By October 2026, although earlier availability is welcomed
Recann is recruiting on behalf of a confidential fitness and wellbeing technology business that is building the infrastructure behind a new generation of digital consumer experiences.
The fitness and wellbeing sector still relies on fragmented systems for bookings, payments, access control and member data. Our client is creating a unified platform, data model and API that will allow development teams to build integrated products in weeks rather than months.
Following the successful creation of an initial working product, the business is now building the production platform beneath it. This is an opportunity to join at a foundational stage, work directly with the CTO and influence the architecture, engineering standards and developer experience from the outset.
The role
As a Senior Full Stack Engineer, you will design, build and scale the platform across both frontend and backend development.
You will take ownership of areas including the TypeScript SDK, REST APIs, frontend architecture, shared components, third-party integrations, testing standards, documentation and release processes.
The environment is remote-first, with occasional in-person collaboration expected for up to one week every few months. Candidates can be based anywhere in the UK, although applicants located in the North or North West would be particularly well placed for team collaboration.
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Key responsibilities
- Develop frontend applications and backend services using TypeScript, React, Node.js, Fastify and TanStack
- Design, build and maintain a TypeScript SDK and developer-facing REST APIs
- Define standards around naming, typing, error handling, versioning and backwards compatibility
- Build and maintain shared React components and consistent state management and data-fetching patterns
- Integrate complex third-party services and external platforms
- Develop secure, scalable and maintainable AWS-based systems
- Improve frontend performance, responsiveness and accessibility
- Contribute to CI/CD, testing, monitoring and engineering quality standards
- Use AI-assisted development tools such as Cursor and Claude to accelerate delivery
- Work closely with the CTO, product colleagues and other senior engineers
Required experience
- Seven or more years of commercial web application development experience
- Strong TypeScript and Node.js backend engineering experience
- Deep commercial experience building applications with React
- Strong REST API design and third-party integration experience
- Commercial AWS experience, ideally including ECS, RDS/PostgreSQL and ElastiCache or Redis
- Experience with CI/CD pipelines and automated testing using Vitest, Jest or similar
- Good knowledge of Git, code reviews and modern development workflows
- Experience building scalable, maintainable and high-performing systems
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Desirable experience
- Designing or maintaining developer-facing SDKs
- Fastify, TanStack Query or shared component libraries
- AWS CDK or Terraform
- Docker and containerised deployment environments
- Localisation, internationalisation or multi-currency platforms
- Fitness, wellbeing, health technology or consumer SaaS products
- AI-assisted engineering tools such as Cursor or Claude
- Accessibility standards, including WCAG 2.1 AA
Why join?
- Shape the architecture and engineering standards
- Work directly with an experienced CTO
- Influence the SDK, API and overall developer experience
- Build a greenfield platform with meaningful ownership
- Work remotely
- Use modern AI-assisted engineering tools
- Contribute to technology that improves fitness and wellbeing experiences
The company provides its standard benefits package, with full details confirmed as part of the offer documentation.
Notice periods
- Three-month probationary period
- One week’s notice during probation
- One month’s notice following probation
The business would ideally like both engineers in place by October 2026. Applications from candidates who can start sooner are particularly welcomed.
Recann is acting as a recruitment agency in relation to these permanent vacancies.
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