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Xenia

Fullstack Developer (Contractor 3 months)

Xeniatech|Xeniatech|Vietnam|3 Jun 2026
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JOB DESCRIPTION

We're building a structured case management tool for certified fraud examiners conducting financial economic crime investigations. The platform enforces a strict phase-gated analytical workflow covering scenarios, falsification testing, and audit trails, without generating automated verdicts or scores. The human investigator stays in control throughout. This isn't a CRUD app; it's a methodology encoded in software, which means the data model, state machine, and UI all need to reflect a level of rigor that most products don't require.

Responsibilities

  • 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

Requirements

  • Vietnamese with Fluent English (C1/C2 level) – Able to communicate complex technical concepts smoothly with international clients
  • 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

Benefits & Perks

  • 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

If you have any questions, please feel free to get in touch with our HR department at hr@xenia.tech.

Learn more about our culture and special benefits package .

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