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IO Tech Solutions Limited

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Senior Full Stack Developer

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Summary

Senior Full Stack Developer in Hong Kong building impact-finance products: integrating third-party REST APIs, developing secure Python backend services and serverless functions on AWS, and delivering responsive front-end/back-end applications while mentoring junior developers.

This is a full-time, on-site role for a Senior Full Stack Developer located in Hong Kong. As a member of our technology team, you will be instrumental in building the next generation of impact finance.

The Senior Full Stack Developer will be responsible for:

  • Integrating complex, third-party REST APIs, including robust handling of authentication, error states, and data synchronization.
  • Developing secure backend services and serverless functions to handle transaction management and policy enforcement.
  • Implementing security protocols for managing user credentials and sensitive data, using services like AWS Secrets Manager.
  • Deploying and managing scalable application infrastructure on AWS.
  • Developing high-quality, responsive front-end and back-end applications.
  • Collaborating with product managers and designers to define technical requirements and deliver a seamless user experience.
  • Mentoring junior developers by performing constructive code reviews and fostering a culture of technical excellence.
  • Documenting implemented logic and enhancing the documentation of our current architecture.
Mandatory Qualifications
  • A minimum of 6 years of professional experience in full-stack development, with a proven track record of shipping complex, production-grade applications.
  • Python: 5+ years of experience building backend services and scripts.
  • Front-End: 6+ years of experience with advanced CSS and frameworks like TailwindCSS.
  • AWS Cloud Services: 6+ years of deep, hands‑on experience designing and managing solutions with DynamoDB, EC2, S3, Lambda, SES, SNS, and ECR.
  • Containers & Microservices: 5+ years of production experience deploying containerized applications with Docker and applying microservice architectures.
  • API Integration: 5+ years of demonstrable experience integrating complex, third-party REST APIs.
  • Database Management: Experience with database schema versioning and data reconciliation strategies for release management.
  • Testing: 5+ years of experience with testing frameworks (e.g., Cypress, Jest) and a commitment to comprehensive test coverage.
  • Collaboration: Expertise with Git for version control and a minimum of 3 years of experience with design handoff tools like Figma.

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