• 📈 Competitive Programmer
  • https://atcoder.jp/users/luma (Top 3% of Japan! 😏 )
  • https://codeforces.com/profile/Luma
  • Contests I was qualified in
    • JOI2017, JOI2018, PCK2017, ICPC2019 Yokohama Regional
    • codeflyer2018, DDCC2017, DDCC2019, DDCC2020
• 😋 Love math and puzzles
• 🎵 Love listening to music
• Neovimmer
• 🗾 Watching animes and reading comics a little
• 🔵 twitter: @lumc_
• 🥳 Born in 2000
• ☕ Job status: Working at Optimind, Inc. 🐈
• Real world name: Teppei KAWAGUCHI

• 2020/03-2020/12: Web Engineer (Frontend/Backend/Infrastructure)
• 2021/01-2022/06: Frourio, inc. Web Engineer (Frontend/Backend/Infrastructure)
• 2022/07-ongoing: Optimind, Inc. Algorithm Engineer (mainly graph and route search algorithms)

• Consistent is always better.
• Simpler is sometimes better. (KISS Principle)
• Shape the experience quickly.

• Frontend
  • TypeScript, Vue.js, React, Preact, Next.js, Nuxt.js, Svelte, vite, ...
  • ESLint, Prettier
  • Testing
    • vitest
  • Webpack
  • Daxie.js (IndexedDB)
• Backend
  • Node.js, prisma, BullMQ, ...
  • Experienced Python Django, Celery, ...
  • Experienced Go and Rust
    • Go: go-swagger (e.g. https://github.com/luma-dev/fish-history-ui)
    • Rust: diesel, tokio
• CI/CD
  • GitHub Actions, Circle CI, GitLab CI, codecov, ...
• IaC
  • Can write to setup cloud infrastructure with terraform and ansible. I like terraform and ansible.
  • Can write terraform with TypeScript with CDK. (e.g. https://github.com/violet-ts/violet-infrastructure)
  • Can read AWS CloudFormation declarations.
• Algorithms & Data Structures
  • C++
  • Redeveloping my knowledges in Rust.
• Continue learning network
  • Qualified in NW
• Continue learning database
• Continue learning security
• Continue learning authentication and authorization.
• AWS and other Cloud services.
  • I've experienced...
    • EC2 , VPC , ALB , ECS , RDS , S3 , SSM , Secrets Manager , ElastiCache , CloudWatch , Lambda , Cognito , Lightsail , EFS , API Gateway , EBS , Dynamo DB
  • Qualified AWS Certified SAA (public URL) on 3 July 2021.
• Experienced Docker, Docker Swarm, ECS, Docker Compose in production
• Learning Kubernetes
  • Experienecd creating controllers with Operator Pattern powered by operator-sdk
• Using Vultr Cloud
• Experienced serverless in production
  • Combined with AWS
• Experienced GraphQL with nexus and apollo stack.
• Continue learning GCP and GKE
  • Used GCP in production
• Experienced unified
  • Built many plugins for my math.luma.dev
• Created many tools for team
  • Bots (Slack, Discord, GitHub App, ...)
  • Investigation tools (mainly WebUI) for everyday workload

• Zenn (Japanese)
• Codeforces blog (English)
• tech.luma.dev (Japanese)
• sketch.luma.dev (Japanese)

• Japanese: Native ヾ(^▽^*)))
• English: Intermediate ( currently learning in listening/speaking )
  • Experienced discussions in-person with colleague in business.
  • Experienced chat in business and dev community more than 5 years.