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About the Role
Design, build, and maintain mission-critical user interfaces for Acra, our secure-enclave platform protecting sensitive government and commercial workflows. Bridge web and native mobile environments, owning front-end systems end-to-end from UI architecture to client-side performance and security.
Responsibilities
- Architect and build high-performance, accessible, and secure user interfaces across React/TypeScript and native mobile clients (Swift/iOS or Android).
- Own client applications from technical design and UI component implementation through to testing, deployment, observability, and production operations.
- Integrate complex RESTful and WebSocket/event-driven APIs, handling real-time data streaming, optimistic updates, and offline/low-bandwidth resilience.
- Build and maintain a scalable design system that ensures aesthetic consistency, compliance, and strict usability across both desktop and mobile form factors.
- Address client-side security concerns: secure token handling, biometric authentication, encrypted local cache, certificate pinning, and zero-trust session management.
- Partner closely with product managers, UX designers, backend engineers, and security specialists to turn mission-critical requirements into clear interfaces.
- Diagnose and optimize UI performance bottlenecks across browsers and mobile hardware (frame rates, bundle size, memory footprint, battery impact).
- Establish frontend and mobile testing best practices (unit, component, and end-to-end integration tests).
- Raise engineering standards through design reviews, accessible code practices, and thorough documentation.
- Operate independently in a fast-paced environment with strong ownership and product thinking.
Requirements
- Strong professional engineering experience building production-grade web applications with modern React and TypeScript.
- Solid hands-on native mobile development experience with Swift (iOS) or Kotlin/Android (or proven experience bridging cross-platform architectures with native modules).
- Deep understanding of modern UI architecture, state management paradigms, and responsive design systems.
- Experience consuming, designing, and optimizing APIs (REST, WebSockets, or GraphQL) for client performance and intermittent connectivity.
- Familiarity with client-side security fundamentals (content security policies, token management, secure device storage, threat modeling at the client layer).
- Strong track record of end-to-end feature ownership from Figma mocks to app deployment and post-release monitoring.
- Disciplined approach to automated testing (Jest, React Testing Library, XCTest/Espresso, Playwright/Cypress).
- Excellent debugging skills across web browsers, native mobile runtimes, device profiles, and network conditions.
- Product-minded engineering judgment: you care deeply about how users navigate critical workflows, not just what ticket needs to be resolved.
- A self-driven, ownership-oriented mindset comfortable with technical ambiguity and fast feedback loops.
- Experience building interfaces for secure or regulated environments (defence, government, cybersecurity, fintech, or critical infrastructure).
- Familiarity with WebAssembly (Wasm), client-side cryptography, or zero-knowledge protocols.
- Hands-on experience with native mobile app deployment, MDM (Mobile Device Management) enterprise distribution, or App Store / Play Store governance.
- Experience with real-time collaborative interfaces, mapping/GIS visualisations, or tactical telemetry dashboards.
- Familiarity with container-based frontend workflows, mobile CI/CD pipelines (Fastlane, GitHub Actions), and frontend observability tools (Sentry, Datadog RUM).
- Systems where auditability, accessibility compliance (WCAG 2.1+), and operational evidence are first-class requirements.
Skills
- React
- TypeScript
- Swift
- Kotlin
- Java
- RESTful APIs
- WebSockets
- UI Architecture
- State Management
- Responsive Design
- Client-side Security
- Automated Testing
- Debugging
- WebAssembly
- Client-side Cryptography
- Zero-knowledge Protocols
- Mobile CI/CD
- Observability Tools
Location
- London HQ
Work Type
- Hybrid
Experience Level
- Professional Engineering Experience
Salary/Compensations
- Competitive salary
Benefits
- Equity
- Competitive salary
- Employer pension contributions
- Private health insurance
- Hybrid work setup
- Rewarding company retreats and meetups
About the Company
- Valarian Technologies is a dual-use technology company building critical tools to safeguard the future in an era of evolving global security challenges.
- We're rethinking security beyond traditional military domains, addressing asymmetric threats that impact our technological advantage, economic strength, and democratic institutions.
- We build Acra – the platform foundation for everything we do as a dual-use technology company.
- The platform’s name, rooted in the Greek word for citadel (or, fortress), reflects the design and purpose of our infrastructure-agnostic secure enclaves: protecting critical data.
- Some of the government and commercial workflows include: increased operational resiliency for mission-critical systems and functions; enabling organisations to more quickly and widely adopt emerging technologies while ensuring the integrity of their intellectual property; information flow during disaster response scenarios, and zero-trust / least-privilege environments for M&A, attorney-client privileged communications, etc.
- At our core, we're driven by a shared mission and a belief in making a tangible impact on our world.
- Whether you join our London HQ or the wider global organisation, you’ll be a part of collaborative, high-performing teams, creating cutting-edge software, platforms, and infrastructure.