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Experience Engineer (FTC)

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

Full Job Posting

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.
  • Would be great:
  • Product judgement demonstrable from your history: UX decisions made and defended without a design spec.
  • Ownership of a surface or programme through its worst weeks, at any scale.
  • 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).
  • Own features end-to-end, from ambiguous requirements to shipped experience: fills design gaps with defensible decisions and delivers a coherent flow rather than a set of components
  • Contribute actively in refinement: challenge requirements with evidence, propose simpler alternatives, and bring product ideas of your own
  • Know the outcome each feature serves, instruments what they ship so that outcome is measurable, and checks whether it landed (usage, feedback, demo performance) rather than stopping at merge
  • Understand the domain the product lives in (fraud, identity, authentication, and the client's operational world) well enough so that gap-filling decisions reflect
  • Implement non-trivial components and async data flows
  • Diagnose and fix performance and accessibility issues rather than merely detecting them
  • Handle secrets/config surfaces safely
  • Ship features that span frontend, backend service and configuration
  • Debug across the boundary to root cause
  • Significant changes start as a written design others can review, rather than as code
  • Design the test approach for your features (what gets unit, component and e2e coverage, and why)
  • Keep regression suites healthy in your area; e2e failures you own get fixed rather than retried
  • Land toolchain and pipeline improvements (build config, CI automation, test infra, dependency upgrades) beyond your immediate feature work.

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

Qualifications

  • 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
  • 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.
  • Product judgement demonstrable from your history: UX decisions made and defended without a design spec.
  • Ownership of a surface or programme through its worst weeks, at any scale.

Preferred Qualifications

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

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