Fullstack Developer (Contractor 3 months)

• Own architecture and development of core product workflows end-to-end
• Build secure, scalable full-stack features using Next.js, Supabase, and TypeScript
• Design complex workflow systems with strict phase-gated logic and audit trails
• Model structured relationships between investigations, evidence, statements, and scenarios
• Implement RBAC, RLS policies, and workflow integrity safeguards
• Build responsive, mobile-first UI using Tailwind CSS and shadcn/ui
• Integrate third-party services including Stripe and GCP
• Collaborate closely with product and design to turn evolving requirements into production-ready features
• Maintain high standards for code quality, security, performance, and maintainability
• Work autonomously and take ownership of features from planning to deployment

Ways of Working

• Autonomous: Can pick up a PRD, ask the right questions, and move without being micromanaged
• Pragmatic: Knows when to build properly and when to ship something good enough for an MSP
• Communicates proactively: Flags blockers early and gives realistic estimates
• Takes ownership: Accountable for features end-to-end, not just task completion
• Comfortable with ambiguity: The PRD is actively evolving and you’ll be working in a discovery-to-build environment

• 7+ years of experience Senior level, comfortable owning architecture decisions independently
• TypeScript Strong typing across the full stack, no shortcuts
• Next.js + Vercel App Router, server components, deployment pipeline
• Supabase (PostgreSQL) Schema design, RLS policies, real-time, storage, authentication
• Tailwind CSS + shadcn/ui Building consistent, accessible UI components
• Stripe Subscription billing and invoicing flows
• Google Cloud Platform (GCP) Storage, cloud functions, or related services
• Mobile-first web applications Responsive, performant UI across device sizes
• AI-native development tooling Actively uses tools like Claude, Codex, or similar as a core part of the daily workflow, not as a novelty
• English fluency Working language is English

Nice to Have

• Experience building complex state machines or phase-gated workflows
• Document generation pipelines including structured PDF export and audit trail formatting
• Role-based access control (RBAC) with strict permission enforcement
• Experience with legal, compliance, or investigative tooling
• Experience with building SaaS products, subscription management.
• Drag-and-drop UI interactions such as evidence linking and matrix interfaces

Domain & Product Experience

• Has built tools where workflow integrity matters, not just happy-path CRUD
• Understands what it means to build an irreversible state machine: no back buttons, no skipping phases, no accidental data loss
• Comfortable with compliance-adjacent products where audit trails, data locks, and process fidelity are non-negotiable
• Experience modelling complex data relationships such as evidence linked to statements, statements linked to scenarios, and scenarios tested across dimensions
• Has shipped features end-to-end: from spec and wireframe through to production

• Work Location: Flexible. This role is open to hybrid or fully remote arrangements for candidates from anywhere in Vietnam.
• An open mind and flat structure where every voice is welcome.
• A work environment built on transparency, seamless communication, trust, and a sensible approach, combined with mixed cultures and a speaking environment

Learn more about Xenia Tech