Experience Engineer: Full-Stack UI/UX & AI-Driven Platform

Callsign; Greater London; On-site; GBP 50,000 - 70,000; Full time

Benefits offered by this job

Pension scheme

Private medical cover

Life assurance

Personal Learning & Development Budget

Cycle to Work Scheme

Company Family Leave

25 days annual leave

Employee Volunteering Program

Job summary

Callsign is seeking a talented developer to join the Experience team on a 12-month fixed-term contract ideally starting in 2026. The role focuses on delivering coherent user experiences across the client portal, including enhancements driven by client feedback and data analysis.

Key responsibilities include shipping features across the stack, improving toolchains, and implementing measurable outcomes for product features.

Qualifications

• Solid experience in JavaScript, TypeScript, and React.
• Must have familiarity beyond frontend work with APIs or services.
• Proven system design and architecture skills.
• Experience with AI integration in product development.
• Ability to design a testing approach.

Responsibilities

• Ship features across the stack including TypeScript/React frontends.
• Implement and debug frontend components and async data flows.
• Design test approaches for shipped features.
• Contribute to CI automation and build config improvements.

Skills

JavaScript/TypeScript

React

API design

System design

Testing instinct

Tools

GitLab CI/CD

Terraform

Job description

Callsign is seeking a talented developer to join the Experience team on a 12-month fixed-term contract ideally starting in 2026. The role focuses on delivering coherent user experiences across the client portal, including enhancements driven by client feedback and data analysis.

Key responsibilities include shipping features across the stack, improving toolchains, and implementing measurable outcomes for product features.