Senior Full-Stack Engineer

Addition
London, United Kingdom
Last month
£85,000 – £100,000 pa

Salary

£85,000 – £100,000 pa

Job Type
Permanent
Work Pattern
Full-time
Work Location
Remote
Seniority
Senior
Security Clearance
Required
Posted
27 Apr 2026 (Last month)

Benefits

Remote-first working Flexibility and autonomy Genuine ownership of a critical platform Opportunity to influence architecture and technical direction Exposure to a unique blend of telecoms, cloud, and applied AI Small, agile team with fast decision-making and visible impact Culture built on clarity, accountability, and long-term thinking

Senior Full-Stack Engineer Introduction

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.

Role Overview:

  • Location: Remote (UK-based)
  • Package: Competitive salary + benefits
  • Industry: Telecoms / SaaS / Compliance Technology

What You’ll Be Doing:

  • 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

Main Skills Needed:

  • 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

Call to Action:

If you’re nodding along, let’s take the next step.

We are an equal opportunity employer and value diversity at our company. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status.

By applying you are confirming you are happy to be added to the Addition Solutions mailing list regarding future suitable positions. You can opt out of this at any time simply by contacting one of our consultants.

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