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Fullstack Engineer (Claude)
About the Job
99Tech provides next-generation MarTech services. Our modular platform enables companies around the world to unlock new revenue opportunities and massively scale their business.
We are accelerating our expansion in R&D and product development. We offer an exciting and challenging environment where you will grow and learn. If you are passionate about delivering a marketing ecosystem that is innovative, secure and intuitive, this role could be for you.
As a Full-Stack Engineer, you will work closely with product managers, architects, and engineers to evolve the MarTech platform — from backend APIs to polished frontend experiences.
You will also be expected to leverage AI tools (e.g., Claude Code) intentionally and skillfully — as a force multiplier, not a crutch.
Responsibilities
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Engineer backend systems and RESTful APIs using Node.js (Express).
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Build responsive, performant frontend interfaces using React + TypeScript.
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Design and implement PostgreSQL schemas that support complex product requirements.
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Write clean, testable, well-documented code, and help hold that standard across the team.
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Use AI tools to accelerate development, debug, and solve architecture problems — while validating outputs.
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Analyze, propose, and deploy relevant technologies to meet product requirements.
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Collaborate across teams with clear technical communication in English.
Requirements
Must-have
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Ability to effectively use Claude Code for software development and testing
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Solid experience with Node.js and one of Express / Fastify / Hono.
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Proficiency in React with TypeScript (hooks, state management, component design).
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Strong understanding of PostgreSQL (schema design, indexing, query optimization).
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Familiarity with REST API design and HTTP fundamentals.
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Understanding of authentication patterns (JWT, sessions, OAuth basics).
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Strong advocate of code quality, testing, and craftsmanship.
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Communicates clearly in English.
Nice-to-have
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Experience with AI ecosystem and tools, like OpenClaw, MCP, …
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Experience with Redis (caching, pub/sub, rate limiting).
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Familiarity with Docker and containerized local dev environments.
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Exposure to queue systems (BullMQ, RabbitMQ, SQS).
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Experience with frontend data fetching patterns (React Query, SWR).
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Knowledge of CI/CD pipelines.
Mindset (non-negotiable)
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You take ownership.
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You use AI tools intentionally and skillfully and truly understand the code that AI writes.
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You care about the user experience, not just making the test pass.
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Newbies are welcomed if they can complete the code challenge.
What we evaluate
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Backend correctness and business rules
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API design (conventions, error handling)
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Frontend quality (UX, loading/error states, component structure)
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Code quality (readability, separation of concerns)
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AI collaboration (judgment, transparency)
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Testing (meaningful coverage and rationale)
99Tech cung cấp các dịch vụ MarTech thế hệ mới. Nền tảng mô-đun của chúng tôi cho phép các công ty trên toàn thế giới khai phá các cơ hội doanh thu mới và mở rộng quy mô kinh doanh một cách mạnh mẽ. Chúng tôi đang đẩy nhanh quá trình mở rộng nghiên cứu và phát triển sản phẩm. Chúng tôi mang đến một môi trường thú vị và đầy thử thách, nơi bạn có thể phát triển và học hỏi. Nếu bạn đam mê xây dựng một hệ sinh thái tiếp thị sáng tạo, an toàn và trực quan, thì vị trí này có thể phù hợp với bạn.