Senior Front-End Software Engineer

Union Technologies is reindustrializing America’s defense manufacturing base with a first-of-its-kind Factories-as-a-Stockpile™ model, integrating advanced robotics, manufacturing, and software into sovereign factory systems at scale. Headquartered in Dallas, Texas, UNION is dedicated to restoring America’s industrial strength and guaranteeing deterrence for the century ahead.

We recently emerged from stealth with $50M in funding led by top-tier venture investors and strategic partners. Read more in our Press Release

Why This Role Exists

Our pilot MES has been validated, and we're expanding the team to deliver first-class UIs for the factory floor. This role centers on server-side rendered applications, leveraging HTMX + Go templates with progressive enhancement to create fast, reliable, and secure workflows for operators, technicians, and supervisors. You'll report to the Head of Software Engineering and work closely with the Principal Software Engineer.

What You'll Do

• Build SSR applications using HTMX + Go templates with progressive enhancement, component reusability, and minimal JavaScript.

• Design operator-facing workflows for traveler routing, work orders, quality checkpoints, data visualization, and real-time machine dashboards.

• Implement resilient form handling: validation, optimistic UI patterns, live updates, and retry strategies for unreliable shop-floor connectivity.

• Define and enforce UI performance budgets (TTFB, latency) and accessibility standards across various display formats.

• Collaborate with backend and controls engineers to model machine/part states; integrate barcode/RFID scanning and label/pack slip printing.

• Harden frontends with secure defaults: CSP, CSRF protections, session management, role-based views, and secure exports.

• Contribute to shared design guidelines, review checklists, and a lightweight SSR/HTMX component library.

• Write and maintain comprehensive tests (unit, integration, HTML diff/snapshot) and integrate client-side observability with SRE dashboards.

• Conduct peer reviews, mentor mid-level engineers, and contribute to technical design discussions and cross-functional planning.

The Stack You'll Work With

• Frontend: HTMX, Go templates, Tailwind CSS, TypeScript (light), WebSockets/SSE, DOM-first utilities

• Backend interfaces: Go services (gRPC/REST), real-time data (WebSockets/SSE), Kafka-backed view models

• Observability: OpenTelemetry, Prometheus/Grafana, Loki; browser RUM

• Security: OAuth2/OIDC, MFA, TLS, CSP/CSRF, tamper-evident audit trails

Required Qualifications

• 5–8+ years building production web UIs with server-side rendering and minimal-JS approaches.

• Strong HTML/CSS fundamentals; proficiency with HTMX (or similar: Alpine.js, Datastar, Turbo, Unpoly) and template engines (Go preferred).

• Experience consuming Go-backed APIs (REST/gRPC) and real-time transports (WebSockets/SSE).

• Proven delivery of performant, accessible UIs in constrained environments (kiosk/tablet, variable networks).

• Strong testing discipline and experience with frontend observability.

• Security mindset: authN/Z, session hardening, secure-by-default UI design.

• Familiarity with modern CSS frameworks and component libraries (Tailwind, Shadcn, Bootstrap, or similar).

Preferred Qualifications

• Experience with manufacturing, MES/MOM, or SCADA UIs; SPC visualization; barcode/RFID integration.

• Comfortable collaborating in UX workflows (Figma, Storybook) and balancing pragmatism with SSR patterns.

• Knowledge of print-friendly layouts, PDF/label generation, and internationalization.

• Familiarity with CMMC/NIST 800-171 constraints on data/UI handling.

• Prior mentorship experience, guiding peers in code quality, design, and delivery practices.

What Success Looks Like After 12 Months

• Operator-critical screens are SSR-first, achieve <200 ms TTFB on LAN, and remain fully usable under degraded connectivity.

• Core workflows (routing, quality, genealogy queries) operate with ≥99.95% front-end availability and clear, resilient error recovery.

• Significant reduction in operator input counts and def