The Role :
You will be the technical owner of our application platform. You will lead the takeover of an existing codebase from an outsourced vendor, set the engineering standards, and build the team that runs it.
Responsibilities :
- Own the end-to-end architecture: Next.js frontend, NestJS backend, Python and Go microservices, Kong API gateway, PostgreSQL, MongoDB and Oracle, and the integration with the principal’s engine over REST and ActiveMQ.
- Lead knowledge transfer from the current vendor: recover undocumented design from code, database and functional specifications, and write it down as architecture documents.
- Prove that the in-house team can build, test and deploy the platform from source.
- Set coding standards, branching and release rules, code review and definition of done.
- Design integration and data reconciliation with external systems and third-party APIs.
- Lead remediation of SAST, SCA and DAST findings: decide fix or justified false positive, and defend the decision with the client’s security team.
- Agree interface contracts with the international principal and coordinate changes that cross that boundary.
- Lead the writing of functional and technical specifications: use cases, business rules, data flows, ERDs, API specifications and acceptance criteria.
- Lead reverse-documentation of existing behaviour, module by module, from source code, database queries, functional design documents and user manuals.
- Keep traceability from requirement to code to UAT scenarios with testers.
- Explain business logic and data flow to the client’s security reviewers, for example when a value can legitimately be empty and where it comes from.
- Run change control: analyse impact, estimate and technically review change requests against contractual scope, and separate defects from new requirements in the punch list.
- Review vendor deliverables during the parallel-run period.
- Interview and select developers, then onboard and mentor them.
- Plan and run the team’s delivery cycle (sprint or release plan), assign work and track it.
- Report progress, risks and transition status to the project manager and the client.
Requirements :
- 7+ years of software development, including 3+ years as software architect, technical lead or lead system analyst of a production system.
- Hands-on depth in TypeScript, Node.js (NestJS or similar) and React (Next.js preferred), and any other such Go or Python backgrounds
- Proven experience taking over, stabilizing or modernizing a codebase written by another team or vendor.
- Microservices, REST/RESTful API, API gateways and message queues related to ActiveMQ, RabbitMQ or Kafka.
- Strong SQL and data modelling on PostgreSQL; working knowledge of MongoDB and Oracle.
- Docker, Kubernetes and Linux in on-premise, restricted-network environments.
- Secure SDLC: OWASP Top 10, and remediating SAST/SCA/DAST findings until a client security gate is passed.
- Plans and estimates: breaks change requests into tasks, estimates effort, and runs sprint or release plans in an Agile or hybrid model under a fixed-scope contract.
- Manages vendors and partners: has run or received a handover from an outgoing vendor, reviewed deliverables against contract scope, and coordinated with an international partner.
- Manages client stakeholders: leads requirement workshops, explains technical decisions to business users, and negotiates scope and change requests.
- Manages risk: keeps a risk and issue log, escalates early, and records key decisions (for example as ADRs).
- Builds team knowledge: documentation habits, pairing and rotation so that no module depends on one person.
- Clear written and spoken Thai and English with clients, vendors and principals.