Tech Lead / Full-Stack Engineer in Tokyo. Web systems · architecture · cloud · enterprise software.

I design and ship complex web systems — from requirements and architecture to production. 5+ years across technical leadership, contract product work, client delivery and independent practice.

Portfolio and case studies → · 日本語 · Русский

Open to selected consulting and contract work: remote from Tokyo, or with teams outside Japan.

• Tech Lead — next-generation warehouse management system. Technical planning and architecture across frontend, backend, cloud, security and WMS/WCS integration; technology selection, architecture standardisation, engineering guidelines, technical PoCs.
• Project lead — consumer AI chat platform, 0→1, in a 20-person cross-functional team. React and TypeScript frontend, Go backend, AWS with Terraform, self-hosted Keycloak as the platform's sign-in entry point.
• Full-stack engineer — packaging-industry SaaS, web and mobile, used by more than ten Japanese companies during the engagement. Access-pattern and index redesign on DynamoDB and AppSync, pagination, search, data migration, Node.js 16 → 20.
• Client delivery — five projects across five industries, two of them led end to end: requirements interviews in Japanese, Next.js and React frontends, AWS deployment, launch and operation.

What was decided and why: aligator527.github.io/work

• Frontend — React, Next.js, TypeScript, React Native, TanStack
• Backend — Go, Node.js, Java/Spring, PHP/Laravel, Python/Django
• Cloud — AWS: Lambda, API Gateway, AppSync, DynamoDB, Amplify, S3, CloudFront; Terraform
• Data and security — PostgreSQL, MySQL, DynamoDB, Keycloak
• AI — LLM integration, RAG, prompt engineering, workflow automation

• logistics-map — 総合物流マップ: first-pass site screening for warehouse location in Japan, built on open statistics. Static Svelte 5, no backend, travel-time and siting algorithms in Web Workers. Live
• career-map — public wage statistics from eleven jurisdictions in one comparison, computed entirely in the browser. Python pipeline, static React. Live
• zairyu-map — an e-Stat crawler and the normalised datasets it produces on foreign residents in Japan, with a map over them. Live
• aligator527.github.io — the portfolio itself: Astro, three languages, static output, zero client JavaScript.

• ivan.d@wanya.group
• linkedin.com/in/aligator527
• Russian (native) · Japanese (JLPT N1) · English