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Senior Experience Engineer (FTC)

Callsign
London, GBR
Temporary
Senior
Onsite
Discovered 2 weeks ago
gitlab-cihelmjavajavascriptterraformtypescript

Full Job Posting

Requirements

  • Key Responsibilities
  • Ship across the stack: TypeScript/React frontends, Node services (with some Java in the portal estate), API contracts, GitLab CI/CD, and deployment via Helm, GitOps and Terraform.
  • Treat the frontend craft triad - accessibility, performance, security - as engineering, with expectations that rise as you grow.
  • Build with AI as a core part of your workflow, with the verification discipline a regulated product demands.
  • Learn the domain deliberately: fraud, identity, authentication, and our clients' operational world, because product decisions made without it are guesses.
  • Write meaningful tests for everything you ship.
  • Required Skills & Experience A must:
  • Solid JavaScript/TypeScript and React.
  • Comfort somewhere beyond the frontend: an API, a service, or infrastructure.
  • System design and architecture, designing features that span frontend, service and configuration.
  • Evidence of AI-native working with stated verification.
  • A testing instinct: you can design a test approach and defend it.
  • Has owned a product surface or platform programme including its worst weeks
  • Can architect a frontend estate live (state, contracts, testing, deployment)
  • Evidence of raising a team's standards
  • Demonstrable product judgement
  • Nice to have:
  • Java in production; design systems or component library work; SDK or library engineering
  • Data visualisation
  • Experience in regulated industries (fintech, identity, payments).
  • Required Skills & Experience

Benefits

  • Pension scheme with Scottish Widows
  • Private medical cover with Vitality
  • Life assurance (4x base salary)
  • Personal Learning & Development Budget
  • Cycle to Work Scheme
  • Company Family Leave
  • 25 days annual leave plus Callsign Bank Holiday
  • Employee Volunteering Program

Preferred Qualifications

  • Java in production; design systems or component library work; SDK or library engineering
  • Data visualisation
  • Experience in regulated industries (fintech, identity, payments).

Responsibilities

  • Product & UX
  • Own a product surface (portal domain, demo platform, SDK) and holds its product decision right
  • Within the direction Product sets, decide what ships and how it works.
  • Translate a brief into an MVP and phases, define the success measures for what ships, and reshape or kill work that will not move them.
  • Your surface carries a live measurement baseline (adoption, task success, performance) that decisions cite and post-release reviews are judged against; a decision that would change the direction goes to the PM, not around them.
  • Propose what to build next from your own product conviction, built from user and client contact, rather than merely executing requests
  • Be trusted to ship client-facing work without design review.
  • Set the technical standard for the estate: your code is the reference.
  • Lead the response to performance, accessibility or security findings, and anticipate them at design time.
  • Own services and their delivery machinery end-to-end (GitLab pipelines, charts, GitOps, infrastructure)
  • Design API contracts consumers can live with long-term
  • Execute cross-repo changes (decommissions, migrations) safely across team boundaries
  • Lead design review for your surface, where their design docs are the reference alongside your code.
  • Own testing strategy for a surface, including the release regression cycle: coordinate it, keep it honest, and drives flake to zero rather than tolerating it.
  • Own platform programmes (package-manager and framework migrations, test-framework transitions, runtime upgrades) end-to-end the plan
  • Translate roadmaps into epics others can execute
  • Mentor junior team members
  • Ship across the stack: TypeScript/React frontends, Node services (with some Java in the portal estate), API contracts, GitLab CI/CD, and deployment via Helm, GitOps and Terraform.
  • Treat the frontend craft triad - accessibility, performance, security - as engineering, with expectations that rise as you grow.
  • Build with AI as a core part of your workflow, with the verification discipline a regulated product demands.
  • Learn the domain deliberately: fraud, identity, authentication, and our clients' operational world, because product decisions made without it are guesses.
  • Write meaningful tests for everything you ship.
  • Required Skills & Experience
  • A must:
  • Solid JavaScript/TypeScript and React.
  • Comfort somewhere beyond the frontend: an API, a service, or infrastructure.
  • System design and architecture, designing features that span frontend, service and configuration.
  • Evidence of AI-native working with stated verification.
  • A testing instinct: you can design a test approach and defend it.
  • Has owned a product surface or platform programme including its worst weeks
  • Can architect a frontend estate live (state, contracts, testing, deployment)
  • Evidence of raising a team's standards
  • Demonstrable product judgement

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