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About the Role

The Experience team owns the human-facing side of Callsign, including the client portal, demo and client management platform, data-product UIs, and the design system. This role is offered as a 12-month fixed-term contract, ideally starting in 2026, and requires the right to work in the UK.

Responsibilities

Own features end-to-end, from ambiguous requirements to shipped experience, filling design gaps with defensible decisions and delivering a coherent flow.
Contribute actively in refinement, challenging requirements with evidence, proposing simpler alternatives, and bringing product ideas.
Understand the outcome each feature serves, instrumenting shipped features for measurable outcomes and verifying their success through usage, feedback, and demo performance.
Understand the domain (fraud, identity, authentication, and client operational world) sufficiently for gap-filling decisions to be informed.
Implement non-trivial components and asynchronous data flows.
Diagnose and fix performance and accessibility issues.
Handle secrets and configuration surfaces safely.
Ship features spanning frontend, backend service, and configuration.
Debug across boundaries to identify root causes.
Write designs for significant changes that others can review before coding.
Design the test approach for features, including unit, component, and end-to-end coverage.
Maintain regression suites and fix end-to-end failures.
Implement toolchain and pipeline improvements, including build configuration, CI automation, test infrastructure, and dependency upgrades.
Ship across the stack: TypeScript/React frontends, Node services, API contracts, GitLab CI/CD, and deployment via Helm, GitOps, and Terraform.
Treat accessibility, performance, and security as core engineering principles.
Build with AI as a core part of the workflow, with verification discipline.
Learn the domain deliberately (fraud, identity, authentication, client operational world).
Write meaningful tests for all shipped work.

Requirements

Solid JavaScript/TypeScript and React experience.
Comfort working beyond the frontend, such as with an API, service, or infrastructure.
Experience with system design and architecture, designing features spanning frontend, service, and configuration.
Evidence of AI-native working with stated verification.
A testing instinct, with the ability to design and defend a test approach.
Product judgment demonstrated through history, including UX decisions made and defended without a design spec.
Experience owning a surface or program through challenging periods.
Experience in regulated industries (fintech, identity, payments) is a plus.
Java in production is a plus.
Design systems or component library work is a plus.
SDK or library engineering is a plus.
Data visualization experience is a plus.

Skills

JavaScript
TypeScript
React
Node.js
API
Service
Infrastructure
System Design
Architecture
AI
Testing
Product Judgement
UX Design
Java
Design Systems
Component Libraries
SDK Engineering
Library Engineering
Data Visualization
Fintech
Identity
Payments
GitLab CI/CD
Helm
GitOps
Terraform
Performance Optimization
Accessibility
Security

Location

Work Type

12 month fixed-term contract

Experience Level

Senior

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