Freelance Software Engineer based in Chiba, Japan.
Building digital products with passion.
About
Who I am
OJTHON
Software Engineer / Freelance
三重県出身、千葉県在住のフリーランスエンジニアです。 フルリモート案件を中心に参画しています。 バックエンドとクラウドインフラを中心に、フロントエンドまで幅広く対応しています。
- Location
- Chiba, Japan
- Experience
- 5+ years
- Main Stack
- Python, TypeScript, AWS, ClaudeCode
- Work Style
- Full Remote
Life & Family
犬（マルプー）と猫（スコティッシュフォールド）と一緒に暮らしています。
読書、筋トレ、ドライブ、個人開発が趣味です。
最近はホームジムでトレーニングするインターバル中に、Claude CodeとVibe Codingするのが日課になっています。
Pal
マルプー
Norn
スコティッシュ
Works
My Projects
物販事業者向けBtoB SaaS
楽市クーポン
My Portfolio
OJTHON.dev Home
My Blog
OJTHON.dev BLOG
ECサイト価格監視ツール
AmaPriceMonitor
Crowdsourcing
各種クラウドソーシング案件
エネルギー / IoT
VPP(仮想発電所)関連システム開発案件
自動運転 / 遠隔運行管理
自動運転車両関連システム開発案件
Skills
Technologies I work with
Backend
Fast API
Python
Django![Django Rest Framework](data:image/svg+xml,%3Csvg xmlns="http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg" width="128" height="128" viewBox="0 0 128 128"%3E%3Cpath fill="%23cecece" d="M64.347 41.619v4.292H44.872l-.029-.028l-.028.027H6.696a.07.07 0 0 0-.07.07v18.955H.5v.417h6.127v18.717a.07.07 0 0 0 .07.069h18.836v8.54h.417v-8.54h18.685v.07h.11l.097.097l.101-.097h.109v-.07h19.295v3.046h.416v-3.046H84.14v.07h.109l.1.097l.097-.097h.11v-.07h18.675v4.155h.416v-4.155h18.85a.07.07 0 0 0 .069-.07V65.353h4.934v-.417h-4.934V45.98a.07.07 0 0 0-.07-.07h-18.849v-.013h-.416v.014H84.378l-.028-.028l-.029.027H64.764v-4.29zm-57.484 4.43h18.67v18.71zm19.087 0h18.685v.04L25.95 64.747zm19.102 0h19.295v18.706l-19.295-18.67zm19.712 0h19.377v.036l-19.377 18.75zm19.793 0h18.674v18.685L84.557 46.09zm19.09 0h18.682L103.647 64.77zm-96.882.099l18.747 18.787H6.765zm115.66 0v18.787h-18.747zm-77.375.13l19.28 18.657H45.05zm39.088 0v18.657h-19.28zm-39.505.008v18.648H25.956zm39.922 0l18.674 18.645v.004H84.555zM6.764 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Django Rest FrameworkFrontend
Next.js
TypeScriptInfrastructure
![AWS](data:image/svg+xml,%3Csvg xmlns="http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg" width="256" height="153" viewBox="0 0 256 153"%3E%3Cpath fill="%23252F3E" d="M72.392 55.438c0 3.137.34 5.68.933 7.545a45.373 45.373 0 0 0 2.712 6.103c.424.678.593 1.356.593 1.95c0 .847-.508 1.695-1.61 2.543l-5.34 3.56c-.763.509-1.526.763-2.205.763c-.847 0-1.695-.424-2.543-1.187a26.224 26.224 0 0 1-3.051-3.984c-.848-1.44-1.696-3.052-2.628-5.001c-6.612 7.798-14.92 11.698-24.922 11.698c-7.12 0-12.8-2.035-16.954-6.103c-4.153-4.07-6.272-9.495-6.272-16.276c0-7.205 2.543-13.054 7.714-17.462c5.17-4.408 12.037-6.612 20.768-6.612c2.882 0 5.849.254 8.985.678c3.137.424 6.358 1.102 9.749 1.865V29.33c0-6.443-1.357-10.935-3.985-13.563c-2.712-2.628-7.29-3.9-13.817-3.9c-2.967 0-6.018.34-9.155 1.103c-3.136.762-6.188 1.695-9.155 2.882c-1.356.593-2.373.932-2.967 1.102c-.593.17-1.017.254-1.356.254c-1.187 0-1.78-.848-1.78-2.628v-4.154c0-1.356.17-2.373.593-2.966c.424-.594 1.187-1.187 2.374-1.78c2.967-1.526 6.527-2.798 10.68-3.815C33.908.763 38.316.255 42.978.255c10.088 0 17.463 2.288 22.21 6.866c4.662 4.577 7.036 11.528 7.036 20.853v27.464h.17ZM37.976 68.323c2.798 0 5.68-.508 8.731-1.526c3.052-1.017 5.765-2.882 8.053-5.425c1.357-1.61 2.374-3.39 2.882-5.425c.509-2.034.848-4.493.848-7.375v-3.56a70.791 70.791 0 0 0-7.799-1.441a63.874 63.874 0 0 0-7.968-.509c-5.68 0-9.833 1.102-12.63 3.391c-2.798 2.289-4.154 5.51-4.154 9.748c0 3.984 1.017 6.951 3.136 8.986c2.035 2.119 5.002 3.136 8.901 3.136Zm68.069 9.155c-1.526 0-2.543-.254-3.221-.848c-.678-.508-1.272-1.695-1.78-3.305L81.124 7.799c-.51-1.696-.764-2.798-.764-3.391c0-1.356.678-2.12 2.035-2.12h8.307c1.61 0 2.713.255 3.306.848c.678.509 1.187 1.696 1.695 3.306l14.241 56.117l13.224-56.117c.424-1.695.933-2.797 1.61-3.306c.679-.508 1.866-.847 3.392-.847h6.781c1.61 0 2.713.254 3.39.847c.679.509 1.272 1.696 1.611 3.306l13.394 56.795L168.01 6.442c.508-1.695 1.102-2.797 1.695-3.306c.678-.508 1.78-.847 3.306-.847h7.883c1.357 0 2.12.678 2.12 2.119c0 .424-.085.848-.17 1.356c-.085.509-.254 1.187-.593 2.12l-20.43 65.525c-.508 1.696-1.101 2.798-1.78 3.306c-.678.509-1.78.848-3.22.848h-7.29c-1.611 0-2.713-.254-3.392-.848c-.678-.593-1.271-1.695-1.61-3.39l-13.14-54.676l-13.054 54.59c-.423 1.696-.932 2.798-1.61 3.391c-.678.594-1.865.848-3.39.848h-7.291Zm108.927 2.289c-4.408 0-8.816-.509-13.054-1.526c-4.239-1.017-7.544-2.12-9.748-3.39c-1.357-.764-2.29-1.611-2.628-2.374a5.983 5.983 0 0 1-.509-2.374V65.78c0-1.78.678-2.628 1.95-2.628a4.8 4.8 0 0 1 1.526.255c.508.17 1.271.508 2.119.847a46.108 46.108 0 0 0 9.324 2.967a50.907 50.907 0 0 0 10.088 1.017c5.34 0 9.494-.932 12.376-2.797c2.882-1.865 4.408-4.577 4.408-8.053c0-2.373-.763-4.323-2.289-5.934c-1.526-1.61-4.408-3.051-8.561-4.408l-12.292-3.814c-6.188-1.95-10.765-4.832-13.563-8.647c-2.797-3.73-4.238-7.883-4.238-12.291c0-3.56.763-6.697 2.289-9.41c1.525-2.712 3.56-5.085 6.103-6.95c2.543-1.95 5.425-3.391 8.816-4.408c3.39-1.017 6.95-1.441 10.68-1.441c1.865 0 3.815.085 5.68.339c1.95.254 3.73.593 5.51.932c1.695.424 3.306.848 4.832 1.357c1.526.508 2.712 1.017 3.56 1.525c1.187.679 2.034 1.357 2.543 2.12c.509.678.763 1.61.763 2.797v3.984c0 1.78-.678 2.713-1.95 2.713c-.678 0-1.78-.34-3.22-1.018c-4.833-2.204-10.258-3.306-16.276-3.306c-4.832 0-8.647.763-11.275 2.374c-2.627 1.61-3.984 4.069-3.984 7.544c0 2.374.848 4.408 2.543 6.019c1.696 1.61 4.832 3.221 9.325 4.662l12.037 3.815c6.103 1.95 10.511 4.662 13.139 8.137c2.628 3.476 3.9 7.46 3.9 11.868c0 3.645-.764 6.951-2.205 9.833c-1.525 2.882-3.56 5.425-6.188 7.46c-2.628 2.119-5.764 3.645-9.409 4.747c-3.815 1.187-7.799 1.78-12.122 1.78Z"%2F%3E%3Cpath fill="%23F90" d="M230.993 120.964c-27.888 20.599-68.408 31.534-103.247 31.534c-48.827 0-92.821-18.056-126.05-48.064c-2.628-2.373-.255-5.594 2.881-3.73c35.942 20.854 80.276 33.484 126.136 33.484c30.94 0 64.932-6.442 96.212-19.666c4.662-2.12 8.646 3.052 4.068 6.442Zm11.614-13.224c-3.56-4.577-23.566-2.204-32.636-1.102c-2.713.34-3.137-2.034-.678-3.814c15.936-11.19 42.13-7.968 45.181-4.239c3.052 3.815-.848 30.008-15.767 42.554c-2.288 1.95-4.492.933-3.475-1.61c3.39-8.393 10.935-27.296 7.375-31.789Z"%2F%3E%3C%2Fsvg%3E){kind=small}
AWS
Terraform
Docker![Render](data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="24" height="24" viewBox="0 0 24 24"><path fill="currentColor" d="M18.263.007c-3.121-.147-5.744 2.109-6.192 5.082c-.018.138-.045.272-.067.405c-.696 3.703-3.936 6.507-7.827 6.507a7.9 7.9 0 0 1-3.825-.979a.202.202 0 0 0-.302.178V24H12v-8.999c0-1.656 1.338-3 2.987-3h2.988c3.382 0 6.103-2.817 5.97-6.244c-.12-3.084-2.61-5.603-5.682-5.75Z"%2F%3E%3C%2Fsvg%3E){kind=small}
RenderDevelop Environment
ClaudeCode
GitHub
VSCode
MacCareer
My professional journey
大学
名古屋大学工学部を卒業。 卒業研究の一環でタンパク質のデータベース解析をするプログラムをPerlで書いたのが、プログラミングとの出会い。
小説家志望
大学卒業から約2年間、小説家を目指して活動。 拙作がとある小説新人賞の最終選考に残り、担当編集者と作品づくりに励むも、最終的にデビューには繋がらず。
就職
都内の某IT企業にSEとして入社。 自社開発クラウドPBX系サービス部門のデリバリSE (正社員) として、顧客へのヒアリング / 要件定義 / 利用者教育 / 導入後のサポート対 応 / クラウド環境へのPBXサーバ構築 / 各種機器キッティング / 顧客提供用ツールの開発などを担当。
副業
当初はプリセ寄りのキャリアを志していたが、モノづくりとプログラミングが恋しくなり、副業としてクラウドソーシングで個人開発の受注を開始。 主に物販事業者のクライアント様向けに、Pythonを用いたWebアプリやデスクトップツールを提供。
個人事業主化
大卒後勤めていた会社を退職し、フリーランスエンジニアとして独立。 主にPython/AWSを用いてフルリモートで稼働しつつ、副業の個人開発も継続。
現在
現在もフリーランスエンジニアとして活動中。 クライアント様とのお仕事の傍ら、Claude Codeを活用して個人開発にも精力的に取り組んでいます。
Contact
Get in touch with me
または SNS でご連絡ください