GSGabriel Shimosaka
@gabrielshimosaka
Senior backend engineer specializing in low-latency, high-throughput financial systems and cloud-native architecture.
BrazilWhat I'm looking for
Senior Software Engineer with 6+ years of experience building and scaling high-availability, low-latency, and high-throughput distributed systems within the financial sector. I specialize in Java, Kotlin, AWS, microservices, event-driven architecture, and backend performance engineering, with a track record of driving measurable improvements across mission-critical platforms.
I’m passionate about solving complex backend and distributed systems challenges — from optimizing algorithmic pipelines and concurrency models to architecting reliable, scalable, cloud-native services. My work has reduced computation overhead by 97%, improved latency to sub-5ms, decreased critical incidents, and modernized legacy systems into maintainable, high-performance cloud architectures.
I thrive in environments where reliability, performance, and correctness truly matter. Whether leading architectural decisions, mentoring engineers, designing distributed systems, or driving DevSecOps initiatives, I focus on building robust, secure, and observable platforms that scale.
Experience
Work history, roles, and key accomplishments
Tech Engineering Specialist
C6 Bank
Sep 2024 - Present (1 year 4 months)
Refactored and optimized core profitability algorithms, reducing computation overhead by 97% and achieving sub-5ms latency, significantly improving system throughput and error rates (-99.9%);
Standardized Redis client usage across services, resolving architectural inconsistencies and cutting read latency by 30% without requiring infrastructure changes
Senior Tech Engineer
C6 Bank
Oct 2022 - Aug 2024 (1 year 10 months)
Implemented a new conciliation architecture that reduced end-to-end processing time by 90% and increased system stability for high-volume financial transactions;
Led backend and API development for the Treasury Bond MVP in under 4 months, enabling a new high-value client experience.
Senior Software Engineer
zFlow
Dec 2021 - Sep 2022 (9 months)
Built a scalable CI/CD ecosystem (AWS + Serverless + Python/Bash) that delivered 50% faster builds, 80% faster pipeline setup, and reduced debugging effort for new pipelines;
Designed secure REST API integrations for mobile/web applications using Keycloak, ensuring robust OAuth2 and rolebased access control.
Software Engineer
zFlow
Apr 2021 - Nov 2021 (7 months)
Developed and deployed the entire Open Finance platform end-to-end, ensuring regulatory compliance, high scalability, and secure API integration;
Designed and implemented high-throughput financing modules used by one of the largest banks in the Southern Hemisphere, ensuring low-latency processing and sustained performance under large scale transaction loads
IBMigrated legacy mainframe systems to a modern cloud-based Spring Boot architecture, improving maintainability, performance, and deployment automation;
Promoted to Mid Level Software Engineer after only 12 months, driven by consistently delivering top-tier results and maintaining exceptional client satisfaction.
Education
Degrees, certifications, and relevant coursework
UPUniversidade Tecnológica Federal do Paraná
Bachelor of Science, Computer Engineering
2015 - 2019
Completed a Bachelor of Science in Computer Engineering with coursework and projects focused on software engineering, systems architecture, and distributed systems.
Tech stack
Software and tools used professionally
Availability
Location
BrazilAuthorized to work in
Social media
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