Ryota Ikezawa
Senior software engineer and architect with 10+ years of experience. At freee K.K. since November 2015, experiencing the company's growth from ~100 to 2,000+ employees. Progressed through SWE roles — data aggregation development, tech lead, EM, architect — before moving to SRE. Led legacy system remodeling, microservice design, and multi-tenant data isolation boundary design. Volunteered for an EM role for about a year, then returned to the TL/IC track to take responsibility for technology rather than people. After serving as architect on freee's HR/Payroll Integration Platform team, moved to SRE in June 2026 as tech lead on platform engineering. Continuous experience leading and delivering within globally distributed teams (Japan / Philippines). Core stack: Go, TypeScript, Ruby, Rails, React, Kubernetes, gRPC, MySQL, ArgoCD, Datadog.
Work Experience
10+ years at freee K.K. since November 2015, a cloud accounting software provider (100 → 2,000+ employees). Started with data aggregation feature development, progressed through Tech Lead, Engineering Manager, and Architect roles, currently serving as SRE Tech Lead. Continuously involved in hiring and incident response. Leveraging tenure from early stage, contributed to multiple existing-system remodeling and re-architecture efforts.
Tech lead on the SRE team, driving platform engineering. Focused on observability and self-service-driven developer experience across the platform, including the container infrastructure and networking.
Led the team as EM during the launch phase (first ~6 months), then moved to the Architect/IC track. Main focus: gRPC API redesign and re-delineation of application responsibility boundaries. Drove master data decomposition and microservice design across a multi-product environment. Cross-team coordination with feature owners, auth platform, and QA teams.
As a contractor, handled Rails framework upgrades, dependency management, and migration from Paperclip to ActiveStorage.
Worked on infrastructure migration projects from on-premises environments to AWS (public cloud).
Projects
Access control middleware for Hono leveraging Cloudflare Workers request.cf properties.
Webhook signature verification middleware for Hono. Supports Stripe, GitHub, Slack, Shopify, Twilio and custom providers.
Idempotency middleware for Hono. Prevents duplicate request execution.
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Skills
Programming Languages
Frontend
Frameworks & Runtime
Databases
Infrastructure & Tooling