Outsourcing Advantage is a boutique business process outsourcing provider specializing in back-office and customer support services for US-based companies. We are seeking a highly experienced Senior Full Stack Software Developer to take ownership of an existing AI-generated bookkeeping software platform and drive it through completion.

This is an exciting opportunity for a self-sufficient, solution-oriented developer who can independently assess, troubleshoot, improve, and deliver a complex software product with minimal direction. The ideal candidate has strong full stack development expertise, a solid understanding of accounting principles, and proven experience taking software projects from planning to production.

This is a temporary remote position expected to last approximately 8 months.

Key Responsibilities

- Take full ownership of an existing bookkeeping software platform

- Analyze the current system architecture, codebase, and business logic

- Identify technical, functional, and financial data integrity issues

- Design and implement scalable solutions to improve system performance, reliability, and usability

- Independently prioritize development tasks and drive projects with minimal supervision

- Collaborate with stakeholders to understand business requirements and translate them into technical solutions

- Ensure accounting workflows, financial calculations, reports, and outputs are accurate and reliable

- Debug, refactor, optimize, and enhance the existing codebase

- Create and maintain technical documentation when necessary

- Conduct comprehensive testing and validation to ensure software quality and financial data accuracy

- Deliver the platform to a production-ready state

Requirements

- 6-7 years of professional experience in full stack software development

- Proven experience owning software projects from planning through deployment

- Strong understanding of accounting principles, bookkeeping workflows, and financial reporting

- Experience inheriting, reviewing, and improving existing software applications





- Excellent troubleshooting, analytical, and problem-solving skills

- Ability to work independently with minimal supervision

- Strong communication and project management skills

- Strong experience with Docker deployment in development and production environments

Preferred Qualifications & Idóneo Candidate Profile The ideal candidate will have:

- Experience developing or maintaining accounting, bookkeeping, ERP, or financial software platforms

- Experience reviewing and improving AI-generated codebases

- Experience performing software audits, financial reporting, data validation, and reconciliation processes

- Ability to establish technical direction and make sound architectural decisions

- Experience working with and optimizing existing or legacy software applications
- A portfolio, GitHub repository, or examples of completed software projects is an advantage
- The ability to quickly understand and work within an unfamiliar codebase
- The ability to thrive in situations where requirements or documentation are incomplete
- A proactive mindset with the initiative to take full ownership of projects with minimal supervision
- A strong understanding of both software engineering and accounting principles
- The ability to identify expected system behavior, implement effective solutions, and validate financial outputs for accuracy
- A proven track record of successfully delivering complex software projects from development through production

- Excellent analytical, troubleshooting, and problem-solving skills with strong attention to detail
- A commitment to building reliable, scalable, and production-ready software solutions

- Availability to work with significant overlap during Eastern Standard Time (EST) business hours

Technical Requirements

Strong experience with

- TypeScript

- Quickbooks

- React

- Vite

- Tailwind CSS

- Node.js

- Express.js

- PostgreSQL

- Drizzle ORM

Benefits

- Competitive salary

- Opportunity to work on an innovative accounting software platform

- Supportive and collaborative work environment

- Weekly payments

- Weekends off

- Growth opportunities

📌 Senior Full Stack Software Developer (México)
🏢 OSA Outsourcing Advantage
📍 México