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[Hiring] Senior UI / UX Developer @Milestone Technologies, Inc. Job at Milestone T

[Hiring] Senior UI / UX Developer @Milestone Technologies, Inc. Job at Milestone T

MediabistroGermany, OH, United States
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Job Overview

We7re hiring a Senior UI / UX Developer to design and build user interfaces for an AI-first, data-centric platform. Youll own the end-to-end experience for chat / assistive workflows, human-in-the-loop (HITL) approvals , and explainability views (sources, rationales). The ideal candidate blends product sense with strong frontend engineering, accessibility, and design-system rigor-shipping fast, usable, and secure interfaces.

Key Responsibilities

  • Product UX & Flow Design : Define user journeys for discovery answer approval action; craft low / high-fidelity prototypes and interaction specs.
  • HITL & Explainability UI : Build approval modals and review panes that summarize intent, scope, impacted systems, and sources / subgraph rationale; ensure clear confirm / reject flows with auditability.
  • Chat & Workspace Interfaces : Implement responsive chat / workbench UI, message streaming, citations, error states, and retries; support role-based views and guardrail feedback.
  • Component Library & Design System : Establish reusable components, tokens, theming, and documentation; maintain consistency, accessibility, and performance across surfaces.
  • Frontend Engineering : Ship production SPAs with robust state / data fetching, routing, optimistic updates, and skeleton / loading patterns.
  • Accessibility & Quality : Enforce WCAG-aligned semantics, keyboard navigation, focus management, and contrast; write unit / e2e tests and visual regressions.
  • Telemetry & Experimentation : Instrument UX metrics (latency, drop-offs), feature flags, and A / B hooks; partner on dashboards for usability and adoption.
  • Collaboration & Delivery : Work with analysts on acceptance criteria, with backend / AI engineers on contracts, and with security on SSO / entitlement UX. Participate in code reviews and release rituals.

Required Skills

  • Frontend Stack : Expert in React + TypeScript , modern state / data tools, and routing.
  • Styling & Systems : CSS expertise (Flex / Grid), component libs and utility frameworks (e.g., Tailwind, MUI / Ant), design tokens, theming, and responsive design.
  • API Integration : Strong REST / WebSocket / SSE integration, schema-driven development (OpenAPI / JSON Schema), error handling, and pagination / streaming patterns.
  • Testing & Quality : Jest + React Testing Library, Cypress / Playwright, story-driven development (Storybook or similar), visual regression testing.
  • Security & Auth UX : OIDC / OAuth2 SSO flows, CSRF / XSS mitigations, secure handling of tokens / session state, and role-aware UI controls.
  • Performance : Profiling and optimization (bundle splitting, memoization, virtualization), Core Web Vitals awareness, and perceived-latency improvements.
  • Tooling : Git-based workflows, CI / CD familiarity, lint / format / type-safety discipline; strong documentation and design-handoff skills (Figma).

    • Good to Have Skills

  • Explainability & Data Viz : Charts / tables and graph visualizations (e.g., Recharts, D3, Cytoscape.js / Sigma.js) for sources, subgraphs, and call graphs.
  • AI UX Patterns : Prompt / response UI nuances, citation rendering, safety / guardrail feedback messaging, and evaluation review panels.
  • Design Ops : Design token pipelines, theme packs, multi-brand support, and cross-repo component publishing (Storybook / Nx / Turborepo).
  • Observability : Frontend tracing / metrics (OpenTelemetry JS), UX analytics (Segment / GA4), and event taxonomy design.
  • Feature Delivery : LaunchDarkly / Flagsmith, canary / experimentation hooks, and remote config.

    • This role is ideal for a hands-on developer who can turn complex reasoning and approval workflows into fast, accessible, and trustworthy experiences-while building the component foundations others can reuse.

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    Senior Developer • Germany, OH, United States