Luis Osnet

Senior Full-Stack Engineer with 12+ years of experience building scalable software solutions and 8+ years specializing in Ruby on Rails backend development. Deliberately transitioned to independent consulting to broaden technical depth across fintech and edtech stacks, leading system design, API architecture, and distributed systems across multiple industries.

Expertise in fintech infrastructure (SPEI, card issuing, KYC), CI/CD pipelines, Test-Driven Development, Agile methodologies, and technical leadership. Proven track record of collaborating with product managers and stakeholders to shape roadmaps, mentoring engineering teams, and delivering reliable, maintainable software across fintech, real estate, and edtech industries.

Senior Software Engineer - Trasmisora Internacional Mexicana | Feb 2025 - May 2026

• Architected and built a fintech platform from scratch in 6 months with a team of 3 following Shape Up methodology, delivering 30+ API endpoints and integrating Galileo for card issuing and STP for SPEI transfers.

• Implemented full card lifecycle management (creation, activation, PIN, balance), KYC workflows via Truora with biometric validation, and asynchronous webhook pipelines using Solid Queue.

• Developed a Python-based FX aggregation engine collecting real-time exchange rates from multiple international banking sources to support multi-currency operations.

• Designed system architecture using hexagonal design principles and applied TDD practices, improving code reliability, separation of concerns, and long-term maintainability. Contributed to Flutter mobile application development and maintained CI/CD pipelines, extending full-stack participation across backend, API, and mobile layers.

Technologies: Ruby on Rails, PostgreSQL, Python, AWS, Docker, Solid Queue, Flutter, CI/CD, RSpec

Software Engineer / Technical Lead - Modyo | Sep 2024 - Feb 2025

• Led a team of 4 engineers in an Agile/Scrum environment, maintaining a production Ruby on Rails monolith serving 10,000+ active users and ensuring platform stability and continuous feature delivery.

• Identified and resolved N+1 query problems and critical performance bottlenecks, significantly improving response times and scalability for the platform's active user base.

• Designed and delivered course management, content delivery, and student progress tracking features, directly supporting the platform's core educational workflows.

• Contributed to frontend development using Liquid templates and React, collaborating across the full stack to deliver complete user-facing features.

• Collaborated directly with product stakeholders and UX teams to define roadmap priorities, push back on requirements when needed, conducted code reviews, and established engineering best practices.

Technologies: Ruby on Rails, MySQL, React, AWS, Docker, Solid Queue, Liquid Template, CI/CD

Senior Software Engineer - Cantera Digital | Mar 2024 - Aug 2024

• Developed backend services for an AI-powered education platform used by teachers across Mexico, enabling scalable content delivery and classroom management following Agile methodologies.

• Built AI-driven homework generation features leveraging ChatGPT and LLM integration, reducing teacher workload and accelerating content creation workflows.

• Practiced Test-Driven Development (TDD) and delivered comprehensive RSpec test coverage, ensuring data integrity across asynchronous pub/sub communication workflows.

Technologies: Ruby on Rails, PostgreSQL, React, Hotwire, Stimulus, AWS, Docker, ChatGPT, CI/CD, RSpec

Software Engineer / Technical Lead - ArkusNexus | Feb 2023 - Mar 2024

• Engineered a custom Ruby on Rails ETL application to migrate 10M+ records between Amazon Redshift and PostgreSQL, applying system design principles and deploying to AWS to overcome infrastructure constraints.

• Built a document management platform for notary operations from scratch, delivering OCR-powered document extraction and validation services that automated previously manual workflows.

• Designed scalable REST APIs and microservices-oriented data processing pipelines in an Agile/Scrum environment, leading a team of 3 engineers across multiple concurrent backend systems.

Technologies: Ruby on Rails, PostgreSQL, Amazon Redshift, Hotwire, Stimulus, React, AWS, Docker, ChatGPT, CI/CD

Software Engineer / Technical Lead - Homie | Mar 2021 - Dec 2022

• Scaled the engineering team from 3 to 15 developers in 3 months using Agile/Scrum practices and pair programming, maintaining backend delivery momentum despite cross-team dependencies.

• Designed and delivered a lead qualification microservice using TDD practices, streamlining the sales funnel and improving conversion pipeline efficiency.

• Implemented a database-driven feature flag system to control feature rollouts across the platform, enabling safe and gradual releases without additional deployments.

• Collaborated closely with product managers and business stakeholders to shape roadmap priorities, contributing a product mindset to technical decision-making and architecture.

• Led system design decisions and defined technical strategy, mentoring engineers across multiple seniority levels and aligning the engineering roadmap with business objectives.

Technologies: Ruby on Rails, PostgreSQL, Keycloak, React, AWS, Docker, CI/CD, RSpec

Bachelor of Computer Systems Engineering

Tecnologico de Estudios Superiores de Ecatepec | 2009 - 2013