---
title: 'UI Engineer at Valarian Technologies Limited'
canonical: 'https://feeny.ai/job/ui-engineer-valarian-technologies-limited-london-xmm2s61wmfy5'
type: 'job'
last_seen: '2026-11-08'
---

# UI Engineer at Valarian Technologies Limited

- **Company:** Valarian Technologies Limited
- **Location:** London, United Kingdom
- **Employment:** full-time
- **Work type:** hybrid
- **Posted:** 2026-11-02
- **Last confirmed live:** 2026-11-08
- **Apply:** https://jobs.lever.co/valarian/20d5c9b1-3928-4ce4-a8f6-0e9bb3594151

## Job description

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. And we’ve only scratched the surface. 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.

## The Role

You will design, build, and maintain mission-critical user interfaces for Acra, our secure-enclave platform protecting sensitive government and commercial workflows. You will bridge web and native mobile environments—working primarily with React/TypeScript for complex web dashboards and administrative consoles, alongside native mobile platforms using Swift (iOS) or Kotlin/Java (Android) to deliver responsive, zero-trust client applications for operators in the field. You will own front-end systems end-to-end: from UI architecture, state management, and API integration down to client-side performance, local encryption, accessible design systems, and cross-platform reliability. You will help shape the frontend delivery foundations, including modular component architectures, CI/CD testing pipelines, web and mobile packaging, offline-first sync strategies, and secure local storage. ACRA’s architecture separates the control plane, platform enforcement layer, and isolated execution environments. This role requires someone who can build fluid, intuitive interfaces while reasoning clearly about client-side trust boundaries, data leakage prevention, authentication flows, and operational security. This is not a role for someone who only wants to take tickets. We are looking for someone who understands the product vision, advocates for user safety and accessibility, challenges assumptions, and translates ambiguous workflows into crisp, resilient user experiences. What you’ll do: 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. What we are looking for: 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. Nice to have: 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. Benefits: Our benefits are designed to ensure our employees feel taken care of and are proud to be a part of the Valarian team. We are committed to consistently enhancing our benefit package, taking into account the overall well-being and needs of our teammates. Here are the key benefits accessible to all employees at Valarian Technologies: Equity – because you have the right to own what you’re building A competitive salary – because we value your unique skills Employer pension contributions – because you deserve a secure future Private health insurance - because your health is important to us Hybrid work setup – because everyone has different needs Rewarding company retreats and meetups that respect your work/life balance – because we love getting to know each other! Life at Valarian Our culture is built on inclusivity, compassion and flexibility – we want everyone to be empowered to achieve their goals at Valarian. The work we do is vital, but so are the connections that make it happen. We thrive on the shared energy, spontaneous conversations, and mutual trust built when we spend time together. We operate on a hybrid model, gathering in our London office 3 days a week to support one another and collaborate.

## About Valarian Technologies Limited

## Company Overview
- **One‑liner**: Valarian builds infrastructure that lets enterprises and governments run AI, agents and applications inside a hardened, governed environment where the customer — not the vendor — holds the keys.
- **Entity Type**: Private (Series A)
- **Headquarters**: London, United Kingdom
- **Founded**: 2020
- **Founders**: Max Buchan (CEO) and Josh McLaughlin (COO) [valarian.com](https://www.valarian.com/about)

## Core Business
- **Primary industries**: National security, defence, regulated enterprise (finance, critical infrastructure)
- **Target customers**: Government / defence organisations and regulated enterprises that require high‑trust, high‑stakes deployment (B2B)
- **Mission / purpose**: “Building the infrastructure to regain control over your high‑consequence systems” — giving customers model independence, auditability and containment without ceding control to a third party [valarian.com](https://www.valarian.com/)

## Products & Services
- **ACRA (Automated Compartmentalised Runtime Architecture)**: A Kubernetes‑native control architecture that extends the cluster with workload‑level governance. Each workload (model, agent, service) runs inside its own enclave with built‑in policy enforcement, default‑deny networking, short‑lived secrets, per‑workload messaging and end‑to‑end audit. ACRA is cloud‑agnostic and can run on AWS, Azure, on‑prem or air‑gapped. [valarian.com](https://www.valarian.com/)

## Market Standing
- **Valuation / Market Cap**: Not disclosed (private company)
- **Key Metric**: **Total Funding – $70M** (Series A of $50M led by New Enterprise Associates, bringing total to $70M) [valarian.com](https://www.valarian.com/)
- **Notable Investors / Partners**: New Enterprise Associates (lead), plus “leading defence and national security investors”; also backed by operators from Palantir, Darktrace and US Special Operations. [valarian.com](https://www.valarian.com/about)
- **Growth Signals**: Deployed across multiple continents; “100s of enclaves deployed”; headcount grew ~18.5% YoY (from 19 to ~24 employees); actively hiring across engineering, compliance and security roles. [linkedin.com](https://linkedin.com/company/valarian)

## Competitive Advantages
- **Customer‑held keys**: Even Valarian cannot access customer systems after deployment — governance is enforced by the infrastructure, not by privileged access. [valarian.com](https://www.valarian.com/)
- **Model‑independent**: Customers can run any model (open‑weight or frontier) without vendor lock‑in and without the model provider training on their data. [valarian.com](https://www.valarian.com/)
- **Built by operators with real‑world experience**: The team includes backgrounds from US Special Operations, Palantir, Darktrace, secure communications and high‑assurance systems, giving them credibility in environments where failure has real consequences. [valarian.com](https://www.valarian.com/about)
- **Air‑gap ready**: ACRA is cloud‑agnostic and can operate in disconnected, air‑gapped environments — a rare capability designed from day one for government/defence deployments. [valarian.com](https://www.valarian.com/)

## Strategic Focus
- **Current priorities**: Scaling the platform for wider enterprise and government adoption; continuing to harden ACRA as the posture layer for AI workloads; expanding the team (engineering, security, compliance) to meet demand from regulated sectors. [jobs.lever.co](https://jobs.lever.co/valarian)
- **Direction for growth**: Maintain “sovereign control” positioning — enabling customers to own their inference, data and access policies regardless of cloud or infrastructure substrate.

## Why Work Here
- **Culture**: Hybrid work setup with a London HQ (flexibility where it matters, structure where it counts). [valarian.com](https://www.valarian.com/careers)
- **Compensation & benefits**: Competitive compensation, equity, and employer‑enhanced pension contributions. [valarian.com](https://www.valarian.com/careers)
- **Engineering environment**: Work on deep infrastructure (Kubernetes, SPIFFE/SPIRE, Cilium, Istio, Vault, NATS, OpenTelemetry) in a high‑trust, high‑impact domain that spans government, defence and regulated enterprise. Engineers are expected to own meaningful pieces of the platform from day one.
- **Notable perks for job seekers**: Opportunity to work on a product that deals with cutting‑edge AI governance and national‑security‑grade isolation; small but growing team (24 people) where contributions are highly visible.

## Sources
1. [valarian.com – Product page](https://www.valarian.com/)
2. [valarian.com – About page](https://www.valarian.com/about)
3. [valarian.com – Careers page](https://www.valarian.com/careers)
4. [jobs.lever.co – Valarian open roles](https://jobs.lever.co/valarian)
5. [linkedin.com – Valarian company page](https://linkedin.com/company/valarian)

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