At KMS Technology Mexico, we are passionate about building innovative software solutions that drive impact. As part of an international tech company, we offer a collaborative and inclusive environment where your ideas matter and your growth is our priority.

We are seeking a highly skilled Senior Full Stack Developer to join our engineering team. We need an engineer who excels in high-scale backend environments while remaining proficient in modern frontend frameworks.

The ideal candidate will spend approximately 80% of their time focused on the backend, optimizing our PHP/Laravel services and designing complex GraphQL schemas. The remaining 20% will be dedicated to building out intuitive interfaces in React. We are looking for a developer who prioritizes security, performance, and clean architectural patterns in a fintech environment.

Responsibilities:

Backend Engineering (80% Focus)

• Design, build, and maintain robust server-side logic using PHP and the Laravel framework.

• Architect and implement efficient, scalable GraphQL APIs to support internal and external integrations.

• Optimize database queries and schema designs (MySQL/PostgreSQL) for high-concurrency transaction processing.

• Ensure the highest levels of security and PCI compliance across all backend services.

• Write comprehensive unit and integration tests to maintain the reliability of our core payment engine.

Frontend Development (20% Focus)

• Develop and maintain user-facing features using React and modern state management tools.

• Consume GraphQL APIs effectively on the frontend to create seamless user experiences for merchants and partners.

• Ensure a consistent UI/UX by implementing responsive designs and reusable component libraries.

Collaboration & Leadership

• Participate in architectural discussions and provide technical guidance for complex feature sets.

• Conduct thorough code reviews, promoting best practices in security, readability, and performance.

• Work closely with Product and DevOps teams to ensure smooth deployment cycles and high system availability.

Required Skills & Experience

• 5+ years of professional experience in full-stack software development.

• Expertise in PHP and Laravel: Deep understanding of the framework’s internals, service providers, and Eloquent.

• Strong GraphQL Experience: Proven track record of designing and implementing GraphQL APIs (not just consuming them).

• Proficiency in React: Ability to build complex, data-driven interfaces and manage application state efficiently.

• Database: Experience with relational databases at scale (query optimization, indexing, and transactional integrity).

• Git, modern CI/CD pipelines, and containerization (Docker).

Preferred Skills & Knowledge

• Experience in the Payments or Fintech industry.

• Familiarity with PCI-DSS compliance standards.

• Experience with Redis or other caching strategies for high-performance applications.

• Previous experience in a remote-first, senior-level position.

Location: Guadalajara, Jalisco, Mexico (Hybrid) 

Benefits and Perks

Perks you enjoy at KMS Mexico

• Mexican law benefits
• 15 days of PTO (in year zero, from the first year onwards it is 3 days per year).
• 5 days' leave for the death of immediate family members, negotiable.
• Major Medical Expenses Insurance with coverage for immediate dependents (spouse and children).
• Annual performance bonus (≈10% of annualized salary).
• Annual salary adjustment.
• Employee Referral Bonus.
• Paid Certifications / Courses
• Coursera License.
• 5% Savings Fund.
• 5% Grocery Vouchers.