Sign-on Bonus Senior Fullstack Developer - Agentic AI

Top 3 Reasons To Join Us Attractive Salary + Bonus Premium healthcare package for you and your family Upskill with FlexLearn Program The Job Core duties include: Frontend Development Develop and implement user interfaces using React.js, Next.js, and modern front-end technologies Build responsive, accessible UIs with CSS and Material-UI Troubleshoot and resolve end-user issues and optimise automated processes Backend Development Design, develop, and maintain robust backend APIs using Node.js (NestJS)/Golang Build and maintain high-performance, high-throughput services with strict reliability requirements Design and maintain scalable microservices capable of handling high transaction volumes Ensure idempotency, consistency, and fault tolerance across processing flows Implement robust error handling, retry strategies, and reconciliation processes AI-Augmented Development & Collaboration Use agentic AI tools (e.g., Claude Code, Cursor, GitHub Copilot) daily to accelerate development, automate code reviews, and improve code quality Design effective prompts, workflows, and context strategies to maximise output from AI coding agents Identify and implement opportunities to integrate AI agents into development workflows, CI/CD pipelines, and operational processes Collaborate with stakeholders to clarify project requirements and recommend improvements Conduct code reviews with a strong focus on performance, security, and reliability Prepare and maintain comprehensive technical documentation, including SRS and design documents Work closely with DevOps teams to improve observability, monitoring, and alerting. Your Skills and Experience Required skills: At least 5 years of proven experience in full-stack development. Advanced proficiency in JavaScript/TypeScript (ES6+), Node.js, React.js, Next.js, NestJS, or Golang. Strong expertise in designing and integrating RESTful APIs and socket protocols, with sound backend architecture and applied security practices (authentication, authorisation, input validation, secrets handling). Solid experience with relational databases (PostgreSQL, MySQL, SQL Server) and transactional data modelling, plus working experience with NoSQL databases such as MongoDB or DynamoDB. Practical understanding of timeouts, retries, circuit breakers, and idempotency; deep understanding of concurrency, asynchronous programming, and multithreading. Hands-on experience building and running services on AWS (Lambda and similar), GCP, or Azure, provisioned through Infrastructure-as-Code (Terraform, CloudFormation, or equivalent). Proven hands-on use of agentic AI coding tools (Claude Code, Cursor Agent, GitHub Copilot, or equivalent), not limited to chat-based AI use; able to design prompts, workflows, and context strategies that get reliable output from coding agents. Excellent communication with a strong command of English; demonstrated problem-solving, self-motivation, and effectiveness both independently and in a team. Desirable skills: Experience with payment gateways, fintech, or financial systems; knowledge of AS2805, ISO 8583, ISO 20022, or equivalent message formats; knowledge of PCI DSS or payment security standards. Not required; we will train the right engineer on the domain. Strong understanding of Service-Oriented Architecture (SOA) and microservices. Handling peak traffic, failover, and disaster recovery; rate limiting, throttling, and traffic shaping; performance profiling and optimisation. Why You'll Love Working Here - Fully social insurance according to Vietnam Labor Law - Full salary on probation - 13th month salary and performance bonus - Annual leave: 14 days/ year + 01 day off for birthday leave - Performance review twice a year - Annual health check and vaccination - Premium Health Care Insurance (covering for spouse and children) - Personal Learning & Career Development Program (15.6 millions VND/ year) - Health Scheme Program - Laptop provided (Macbook/Window) - Free parking, coffee, snacks, etc - Attractive career path - Regular team dinners and team building activities - International and friendly working environment.