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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 associated design system and engineering standards. This position is offered as a 12-month fixed-term contract.
Responsibilities
- Own a product surface (portal domain, demo platform, SDK) and holds its product decision right.
- Decide what ships and how it works within the direction Product sets.
- Translate a brief into an MVP and phases, define success measures, and reshape or kill work that will not move them.
- Own a live measurement baseline (adoption, task success, performance) for your surface.
- Propose what to build next based on product conviction derived from user and client contact.
- 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 that consumers can use long-term.
- Execute cross-repo changes (decommissions, migrations) safely across team boundaries.
- Lead design review for your surface.
- Own the testing strategy for a surface, including the release regression cycle.
- Coordinate and maintain the integrity of the testing cycle, driving flake to zero.
- Own platform programs (package-manager and framework migrations, test-framework transitions, runtime upgrades) end-to-end.
- Translate roadmaps into epics for execution by others.
- Mentor junior team members.
- 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 engineering disciplines with rising expectations.
- Build with AI as a core part of your workflow, with verification discipline for regulated products.
- Learn the domain deliberately (fraud, identity, authentication, client operational world).
- Write meaningful tests for all shipped work.
Requirements
- Must hold the right to work in the UK.
- 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: ability to design and defend a test approach.
- Experience owning a product surface or platform program through challenging periods.
- Ability to architect a live frontend estate (state, contracts, testing, deployment).
- Evidence of raising a team's standards.
- Demonstrable product judgment.
- 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
- API
- Service
- Infrastructure
- System Design
- Architecture
- AI
- Testing
- GitLab CI/CD
- Helm
- GitOps
- Terraform
- Java
- Design Systems
- Component Libraries
- SDK Engineering
- Library Engineering
- Data Visualization
Location
- UK
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
About the Company
- The Experience team owns the human-facing side of Callsign: the client portal, our demo and client management platform (one platform for the whole client journey, from first demo through to proof of concept, onboarding, integration, analysis and ongoing management), the data-product UIs, and the design system and engineering standards behind all of it.