Matt Kamau
@mattkamau
I’m a senior full-stack engineer building scalable fintech and AI-enabled SaaS platforms.
BrazilWhat I'm looking for
I’m a Senior Full Stack Engineer with 10+ years of experience building scalable fintech, SaaS, and AI-enabled platforms across remote international teams. I focus on modern backend architecture and production-ready delivery across frontend, backend, data, and deployment.
In recent roles, I’ve re-architected core platform services into scalable microservices, scaling capacity from ~10K to 1M+ concurrent users while cutting API latency by 80%+ and reaching 99.99% uptime. I also improve performance, reliability, release quality, and maintainability—especially in high-growth environments.
I build secure APIs and integrations that power real payment and operations workflows, including Pix, boleto, CNAB240/FEBRABAN, and Open Finance. I’ve also delivered AI-assisted classification, anomaly review, and decision-support workflows using Python and LLM-based services, reducing manual review effort by about 30%.
I enjoy building products from the ground up and modernizing underperforming systems. I collaborate closely with distributed cross-functional teams, mentor engineers, and translate system design decisions into maintainable services—using strong testing, CI/CD, and cloud-native practices to ship with confidence.
Experience
Work history, roles, and key accomplishments
Senior Software Engineer
TOTVS
Aug 2021 - Present (4 years 10 months)
Re-architected core platform services into scalable microservices, scaling concurrent users from ~10K to 1M+ and cutting API latency by 80%+, with uptime to 99.99%. Built AI-assisted classification and decision-support workflows and delivered Pix/boleto/CNAB240 & Open Finance reconciliation services using Node.js, Python, PostgreSQL, and Redis.
Senior Software Engineer
Brex
Apr 2018 - Aug 2021 (3 years 4 months)
Built and optimized microservices-based financial workflow services, increasing transaction-processing throughput ~30% and reducing regressions ~30% to improve production support. Delivered full-stack spend management, transaction operations, and internal finance tooling, strengthening reliability with testing, debugging, and CI/CD improvements.
Founding Software Engineer
Brex
Jan 2017 - Apr 2018 (1 year 3 months)
Contributed across frontend, backend, and data modeling while helping build Brex’s core product foundations, including account onboarding, admin tooling, and transaction support workflows. Developed and maintained full-stack features with JavaScript, Node.js, Python, relational databases, and API-driven service patterns, taking increasing ownership in architecture and delivery.
Software Engineer
Shopify
Jan 2014 - Dec 2016 (2 years 11 months)
Developed fintech and payment-related web application features and backend services for internal operational workflows, including tools to manage financial data and day-to-day processes. Supported API development, database workflows, debugging, and production issue resolution in collaboration with senior engineers and business stakeholders.
Education
Degrees, certifications, and relevant coursework
University of Toronto
Master of Science, Computer Engineering
2011 - 2013
Completed a Master of Science in Computer Engineering at the University of Toronto from 2011 to 2013.
University of Toronto
Bachelor of Science, Computer Engineering
2007 - 2011
Completed a Bachelor of Science in Computer Engineering at the University of Toronto from 2007 to 2011.
Tech stack
Software and tools used professionally
Availability
Location
BrazilAuthorized to work in
Job categories
Skills
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