We need a back-end specialist to design and build RESTful APIs in various languages from PHP to Go, that moves data between our F/E, Internal company systems and backend MySQL with a strong focus on clean code, maintainability, and long‑term system stability. You will work primarily in MySQL PHP & Go, but you should be comfortable reading, improving, and debugging logic across multiple languages. In your application, Describe a small detail you fixed that prevented a major future issue and suggest often overlooked improvement most API systems could benefit from. Start your application with the word Loyalty as the very first word. - Participate in weekly code reviews and weekly stand‑up meetings as part of our API Dev Team. - Must work full-time in Vietnam TimeZone 9-5 M-F - Must not work other jobs in parallel. - MUST declare any family businesses, or conflict of interests. - Strong logical reasoning and strategic thinking. - Clean‑code mindset (readability, structure, maintainability, consistent style). - Strong MySQL experience (schema design, indexing, optimisation, query analysis). - What port does MySQL run on? (Required as part of your application.) - Collaborate with a Vietnam-based engineering team using English as the primary working language. You will be evaluated on: - Documentation quality (clarity, structure, completeness) - Ability to PLAN before CODE - API reliability and stability - MySQL efficiency and optimisation discipline - Error‑handling discipline and consistency - Explaining what you know about Vibe Coding. - Contribution to weekly code reviews and problem‑solving discussions This is a full‑time, dedicated role. We do not accept recruiters, multiple-job applicants, outsourcing, or silent subcontracting. We want a developer committed to one company, one mission, and long-term craftsmanship. We offer Long-term, stable remote employment and Opportunities to build advanced systems in a company culture based on loyalty, problem-solving, and proactive thinking. you will work within a disciplined, highly technical engineering team. Comment on "If you must choose between delivering a feature quickly or preventing a predictable future failure, which do you choose and why, what process do you use to solve the issue?" A very strong emphasis will be placed on your documentation quality. Therefor as part of the evaluation process:, you must provide your Git Hub profile for review of clean code quality, commit history, documentation discipline, and project structure. You must also provide your Link ed In profile so we can verify work history, employment continuity, and past responsibilities. You should be prepared to provide several personal and company references from previous roles or projects. As part of your application, explain why you want a single full-time role instead of multiple remote freelance jobs. You will be required to undergo a Security Clearance Check. as well as be required to pass a police background check prior to final acceptance. These checks are mandatory and part of our global compliance and data‑security framework. University degree required. Provide your University degree number/reference for verification. Note if ANY of the above prerequisites or conditions are not met, your application for fulltime work will be voided.