Senior Full Stack Developer

IO Tech Solutions Limited; Hong Kong; On-site; HKD 900,000 - 1,250,000; Full time

Job summary

IO Tech Solutions Limited in Hong Kong seeks a Senior Full Stack Developer to help build the next generation of impact finance. You will own end-to-end development, integrating complex REST APIs, and delivering secure backend services and scalable frontend solutions.

The role emphasizes collaboration with product and design teams, mentoring junior developers, and thorough documentation of architecture. On-site in Hong Kong with a strong, modern stack.

Qualifications

• 6+ years of professional full-stack development experience shipping production-grade apps.
• Python: 5+ years for backend services and scripts.
• Front-End: 6+ years with advanced CSS and TailwindCSS.
• AWS Cloud Services: 6+ years designing/managing DynamoDB, EC2, S3, Lambda, SES, SNS, ECR.
• Containers & Microservices: 5+ years deploying Docker-based microservices.
• API Integration: 5+ years integrating complex REST APIs.
• Database Management: experience with DB schema versioning and data reconciliation.
• Testing: 5+ years with Cypress/Jest and strong test coverage.
• Git: version control; experience with Figma for design handoff (≥3 years).

Responsibilities

• Integrating complex, third-party REST APIs with robust authentication, error handling, and data sync.
• Developing secure backend services and serverless functions for transactions and policy enforcement.
• Implementing security protocols for credentials and sensitive data using 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 requirements and deliver UX.
• Mentoring junior developers via constructive code reviews and promoting technical excellence.
• Documenting implemented logic and enhancing architecture documentation.

Skills

Team collaboration

Code reviews

Security best practices

Testing mindset

Documentation

Tools

Docker

AWS Cloud

TailwindCSS

Figma

Cypress

Jest

DynamoDB

EC2

S3

Job description

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.