Software development
Web apps, iOS apps, admin dashboards and workflow automation — including payments (Stripe), sign-in and cloud (Firebase / Google Cloud).
SOFTWARE × AI
From idea
to working product.
TechAthletes is a technology studio that develops web and mobile software, builds systems with generative AI, and helps teams adopt AI tools in their day-to-day work. We work with you from planning and development to launch and ongoing operations, starting small and validating early.
What we do
AI system development
Features and internal tools powered by LLMs: document summarization and classification, retrieval (RAG), AI agents and content-generation pipelines.
AI tool adoption consulting
Bringing Claude Code, Codex, ChatGPT and similar tools into real work: where they fit, team guidelines, cost control, and support until they stick.
Indie development & side-business advice
Validating ideas, choosing a stack, shipping and setting up payments — shaped so that one person can keep it running.
Examples of work you can bring to us
You can come to us as early as "could AI take this task off our hands?" If one of these is close to what you need, press "Ask about this" and send us a message.
Reading invoices and forms into spreadsheets
AI reads PDFs such as invoices and purchase orders and enters the data into Excel or Google Sheets. Less manual typing, and less time spent checking for copy errors.
Ask about this →First replies to inquiry emails
Incoming inquiries are sorted by topic and a first-reply draft is prepared. Your staff only review and send.
Ask about this →Summaries of meeting notes and daily reports
From recordings or long notes, AI pulls out decisions, action items and deadlines. Less time spent writing and reading them.
Ask about this →A search chat for internal documents
Ask a question about your manuals or policies and get an answer that points to the source passage. Fewer "where is that document?" questions to colleagues.
Ask about this →Setting up parallel Claude Code / Codex workflows
For running several AI agents at once: how to split the work, how to prevent overwrites and accidental commits, and how to cap API spending.
From our own workAgent Tile
Ask about this →A desktop app that grew out of how we run several Claude Code sessions side by side.
AI scoring for written answers
AI proposes a score and comments based on your scoring criteria. Less time spent marking, and a way to check how consistent the scoring is.
From our own work診断士RoadMap Japanese
Ask about this →Our study app offers AI scoring of answers for the second-stage exam of the SME management consultant qualification.
Serverless setups with near-zero fixed costs
An architecture that costs almost nothing while idle, with a hard stop at a budget limit. You can start without adding a monthly fixed cost.
From our own workSector Pulse Murmuration
Ask about this →Our own services also run on serverless setups built mainly on free tiers.
A pipeline for explainer articles and course material
We set up a flow (draft → diagrams → publish) that turns expert knowledge into illustrated articles and learning material. We can also discuss multilingual support.
From our own workPaperLens
Ask about this →Our own site publishing explainers on AI and semiconductors, with diagrams and interactive demos.
Our products
Services we've built and run today. See each site for pricing details.
Shindanshi RoadMap Japanese
A study app for Japan's SME management consultant exam: past questions, AI practice, AI scoring of second-stage answers and interactive explanations.
Free + paid planshindanshi-roadmap.comGoukaku RoadMap Japanese
Plans your next certification around what you already know, so you study only what is left. Covers Japanese bookkeeping, SME consultant and FP level 2 exams.
Freegoukaku-roadmap.comPaperLens
AI papers & fundamentals, explained in JA/EN with diagrams.
Free + paid planta-paperlens.web.appSector Pulse
US/JP sector & stock rankings with metrics and AI picks. Installable PWA.
Free + paid planta-sector-pulse.web.appMurmuration
A social feed where only AIs post and humans just watch.
Freeta-murmuration.web.appTA Blogs
A multi-brand blog network that publishes automatically each morning.
Freeta-blogs.web.appWords Admin
Capture and review the English you couldn't say, with pronunciation feedback.
Free + paid planwords-admin.web.appFamily Allowance
Agree on the chores together, mark them done, then save, spend and look back — pocket money practised at home.
Freeallowance-system.web.appTimes Table Garden
A browser game for the times tables: each of the 81 facts grows in a garden. Pick one of four answers; a missed fact comes back after a hint. The ×2, ×3 and ×5 tables are free (the rest open by a one-time purchase in Japan only). No download, login or ads.
Free + paid plankuku-garden.web.appRelax Fam
Find family-friendly places to unwind with kids — 2,478 spots across Tokyo, Nagoya and Toyota from open data, with nursing and diaper-changing info. Runs in your browser.
Freerelaxfam-947eb.web.appWisekept
Save, search and publish what you did with an AI such as Claude Code as lesson pages. It connects over MCP, stops keys and tokens before they are saved, and keeps versions. Free covers 10 pages (paid plans coming soon).
Freewisekept-app.web.appJapan Off-Peak
A month-by-month calendar of when each of Japan's 47 prefectures has the fewest hotel guests, counted from Japan's official 2025 hotel statistics, with a blog that reads the numbers by month and prefecture. The counted data is sold separately.
Free + paid planjapanoffpeak.comKaeshi
Learn how to reply when someone says something awkward. Each prompt comes with example replies written by our team and the technique each one uses. In English and Japanese. Posting your own reply and voting open soon.
Freekaeshi-dojo.web.appTech Explained from Zero
A video series on how AI and computing work that builds up from part 1 (YouTube). Each part has a written version on PaperLens with the same worked examples. Separate videos in English and Japanese.
Freeta-paperlens.web.appAgent Tile
A desktop app to see and drive many Claude Code sessions at once. Buy once.
Paidtechathletes-store.web.appWorkoutSmith
Workout plans and printable PDFs, organized by goal. Free sample available.
Free + paid planworkoutsmith.gumroad.comThe Agent Operator’s Field Manual
An English-language Kindle book on running coding agents on work that cannot be undone: 26 failures that happened to us, each with the symptom, the verified cause and the practice that now prevents it. Not affiliated with or endorsed by Anthropic.
Paidwww.amazon.comBooks by TechAthletes
Our Kindle books on Amazon (some also in paperback), mostly practical guides to AI and LLMs. Most are in Japanese; one is in English.
Paidtech-athletes.comTechAthletes on note Japanese
Japanese articles on note: open-source alternatives to paid software and SaaS with setup steps, and study notes for Japan's SME consultant exam. Free and paid articles.
Free + paid plannote.comOur books (on sale at Amazon) →
Tech we use
- TypeScript
- Next.js
- Firebase
- Google Cloud
- Stripe
- Swift / Capacitor
- Unity
- Python
- Claude / OpenAI / Gemini API
How we work
- 01
Reach out
Send us a message (form or email) about the task that's slowing you down or what you want to build. It doesn't need to be polished.
- 02
Pick the first task
We talk it through and choose one task to automate first. Scope, estimate and timeline are proposed at this stage.
- 03
Build small, check early
We hand over a minimal working version early and adjust it while you use it in real work.
- 04
Decide whether to continue
Based on the results, you decide whether to continue, extend it to other tasks, or stop there.
We start with a single task. Availability: three to four days a week, fully remote.
Contact
For consultations, quotes or a quick question, please use the form below. We'll review your message and reply to the email address you enter.
We reply in English or Japanese.
Received
Thank you for getting in touch. We'll review your message and reply by email to the address you entered.
Prefer email?: contact [at] tech-athletes.com
We may not reply to sales or solicitation messages.
Tech blog (Japanese)
Our engineering articles now live on the blog.