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Senior Engineer with 11+ years of experience delivering full‑stack applications across backend, frontend, platform, and QA engineering. Recent hands-on work with Ruby, TypeScript, AWS, and Claude Code, with a strong willingness to adapt to and learn new technologies…

Kaique Kandy Koga

Web Developer, Front-End Developer, Back-End Developer, +4

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Senior Engineer with 11+ years of experience delivering full‑stack applications across backend, frontend, platform, and QA engineering. Recent hands-on work with Ruby, TypeScript, AWS, and Claude Code, with a strong willingness to adapt to and learn new technologies…

Available to hire

Senior Engineer with 11+ years of experience delivering full‑stack applications across backend, frontend, platform, and QA engineering. Recent hands-on work with Ruby, TypeScript, AWS, and Claude Code, with a strong willingness to adapt to and learn new technologies

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Language

English

Fluent

Portuguese

Fluent

Work Experience

Senior Software Engineer (Second contract) at JAVLN / Recruit I.T.

January 1, 2025 - January 1, 2026

Leverage Claude Code to boost engineering productivity while working with end-to-end tests, and enable Playwright for end-to-end testing across the JAVLN platform. Partner closely with the Staff Engineer and Lead QA Engineer to align project scope and expectations, using AI-assisted development and iterative improvements to keep quality high.

Ruby on Rails Developer at JAVL N / Recruit IT

January 1, 2025 - January 1, 2026

Developed Ruby on Rails applications, refined requirements with product stakeholders, and delivered features with a focus on maintainability and performance.

Senior Software Engineer (First contract) at JAVLN / Recruit I.T.

January 1, 2024 - January 1, 2026

Built a general ledger system from scratch for an insurance platform in collaboration with the Head of Product. Owned the full delivery lifecycle from requirement refinement and solution design to implementation and production deployment. Worked with reporting teams to align data models and enable Trial Balance and General Ledger reports using Oracle Ecrion, while actively leveraging AI tools such as Copilot and Gemini to improve coding efficiency.

Senior Software Engineer at Flux Federation

January 1, 2023 - January 1, 2025

Owned the full project lifecycle in the billing domain, solving complex problems using Ruby, React, and AWS—from planning and execution to testing and monitoring to ensure smooth and reliable delivery. Documented both technical and non-technical information in Confluence to support knowledge sharing and team alignment. Used observability tools such as Raygun, Honeycomb, Grafana, AWS CloudWatch, and Prometheus, and supported and mentored junior and intermediate engineers.

Ruby on Rails Developer at Flux Federation

January 1, 2023 - January 1, 2025

Led backend development for Rails-based services, implemented RESTful APIs and data migrations, and collaborated with frontend teams using React/Angular/Vue.js.

Ruby on Rails Developer at James Delivery

January 1, 2019 - January 1, 2022

Built and maintained Rails applications, integrated with microservices and CI/CD pipelines to support scaling to a growing user base.

C# / .NET Developer at CIEE/PRASP.NET

January 1, 2018 - January 1, 2019

Developed features for a student management system using C#, ASP.NET, and SQL Server, and provided technical guidance and mentorship to interns within the development team. Led the migration of legacy web forms applications to modern ASP.NET Core and Angular (TypeScript) solutions, improving performance, maintainability, and user experience.

ASP.NET Developer at CIEE/PRASP.NET

January 1, 2018 - January 1, 2019

Developed ASP.NET Core APIs and front-end components, collaborated with stakeholders to shape feature delivery, and supported migration of legacy systems.

Ruby on Rails Developer at Freelance

January 1, 2016 - January 1, 2018

Delivered Ruby on Rails solutions for multiple clients, including system design, feature implementation, and production deployment in agile environments.