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# Senior Full-Stack Engineer

- **Company:** Addition Solutions Ltd
- **Location:** London, UK (Remote available)
- **Experience:** Expert
- **Salary:** £85,000.0 - £100,000.0
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Amazon Web Services, User Authentication, Databases, Continuous Integration, Relational Databases, PostgreSQL, Systems Integration, ReactJS, Delivery Pipeline, Backend, Front End Software Development, Api Design, Elixir
- **Published:** May 20, 2026
- **Apply:** https://find.jobs/jobs-near-me/senior-full-stack-engineer-london/2778386539-2/

## About the Role

* Strong background in building and running production-grade systems
 * Solid backend engineering expertise and API design experience
 * Good understanding of relational databases and data modelling
 * Experience working in regulated or audit-heavy environments
 * Full stack capability across frontend, backend, and database layers
 * Knowledge of secure integrations, authentication, and access control
 * Familiarity with workflow-driven systems and decisioning logic
 * Ability to work across multiple technologies (e.g. Elixir, Node.js frameworks, React-based frontends, PostgreSQL, AWS)
 * Experience or interest in AI-assisted development and code validation

What's in It for You:

 * Genuine ownership of a critical, high-impact platform
 * Opportunity to influence architecture and technical direction
 * Work on products supporting telecom operators and global partners
 * Exposure to a unique blend of telecoms, cloud, and applied AI
 * Small, agile team with fast decision-making and visible impact
 * Remote-first working with flexibility and autonomy
 * A culture built on clarity, accountability, and long-term thinking

## Description

Join a specialist platform operating at the heart of telecoms, compliance, and secure business messaging. This is a senior, hands-on role where you'll take real ownership of a product that underpins trust, validation, and risk decisioning at scale., * Owning the platform end-to-end, from architecture through to delivery

 * Designing and building scalable backend services and APIs
 * Enhancing and maintaining modern frontend applications
 * Defining data models and implementing decisioning logic
 * Improving system performance, reliability, and observability
 * Driving automation across CI/CD, testing, and deployment workflows
 * Collaborating with leadership to shape technical direction and roadmap
 * Ensuring systems meet high standards for security, auditability, and compliance


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