Hai Tech SolutionsHAI TECH SOLUTIONS

Dive into Innovation

We build software.
From idea to product.

We create our own apps and custom software for businesses. From the first idea to a product that works in everyday life.

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A closer look at our work
Son Hai Vu · Portfolio
Son Hai Vu: software engineering portfolio
Omakase GO: restaurant discovery in Shinjuku
Our ideas. Real software.

Our products

Our own ideas. Built with purpose.

Learn Japanese, discover Japan, plan a trip or book your next appointment. Software for the things we care about ourselves.

01Yomi Lens artworkMobile App

Yomi Lens

Scan Japanese texts. Understand more than the translation.

Explore the details

Yomi Lens helps Japanese learners from N5 to N1. Scan a passage to explore translations, vocabulary and grammar explanations. Then scan its questions: the app explains the answers and shows the supporting evidence directly in the text.

  • Analyze Japanese passages from photos, PDFs or pasted text
  • Translations and explanations in German or English
  • Scan questions and trace answers to supporting passages
  • Save vocabulary and study with spaced repetition
React NativeExpoTypeScriptPythonFastAPISudachiPyJMdict
02Manabu artworkWeb app

Manabu

Learn Japanese through videos and stories.

Explore the details

Manabu turns Japanese videos into an interactive learning space. Explore vocabulary, readings and grammar directly in the transcript, and ask Sensei Sakura to explain sentences at your learning level.

  • Your own YouTube links with subtitles or AI transcription
  • Interactive transcripts with timestamps and furigana
  • Word explanations with readings, base forms and context
  • Translations and grammar explanations with Sensei Sakura
Next.jsReactTypeScriptTailwind CSSPostgreSQLPython / SudachiPyGemini AITrigger.dev / WhisperAI.com
03Neo Seichi artworkMobile App

Neo Seichi

Anime pilgrimage, gamified.

Explore the details

A gamified travel app for anime, manga, and gaming fans visiting Japan. Neo Seichi maps real-life locations that inspired famous anime scenes (“Seichi Junrei”) inside a dark, cyberpunk-neon UI.

  • GPS-radius discovery of real anime filming locations
  • Geofenced check-ins, verified within a 50m radius
  • Digital Goshuin stamp passport with XP & levels
  • Community-submitted spots with moderation queue
React NativeExpoNode.jsPostgreSQL + PostGIS
04Omakase GO artworkMobile App

Omakase GO

Real local restaurants, not tourist traps.

Explore the details

Omakase GO helps travellers find authentic restaurants that locals actually use, combining real Japanese bookmark data with geolocation search, AI-powered menu translation, and a GPS-verified check-in passport.

  • Local Score algorithm ranked from real Japanese bookmark data
  • AI menu scanner with instant dish translation & context
  • GPS-verified check-ins, with gold stamps for verified visits
  • Community-submitted hidden gems with upvoting
React NativeExpoSpring BootPostgreSQL + PostGISGemini AI
05OpenBarber artworkFull-stack build

OpenBarber

Discover and book local barbers, instantly.

Explore the details

A full-stack barber shop booking platform. Customers discover nearby shops by location and radius, book appointments as a guest or member, and leave reviews — while shop owners run everything through a dedicated scheduler.

  • Location-radius search with server-side filtering & pagination
  • Guest or logged-in appointment booking
  • Full day/week scheduler grouped by hairdresser
  • i18n support: English, German, Japanese
ReactTypeScriptSpring BootPostgreSQL
06TraveLinked artworkFull-stack build

TraveLinked

Social travel planning, city by city.

Explore the details

A social travel platform for building and sharing multi-stop city tours, discovering points of interest, following fellow travelers, and chatting in real time — with Local Guides surfacing insider tips to nearby visitors.

  • Multi-stop tour itineraries with Google Maps integration
  • Real-time public rooms & private chat via Socket.io
  • Follow, rate, and review tours from the community
  • Geolocation-aware points of interest with live weather
AngularNode.jsExpressMongoDB
Smart TODO Kanban screenshot

Side Projects / VS Code Extension

Smart TODO Kanban

A visual Kanban dashboard for inline TODO, FIXME, WIP, and OPTIMIZE comments. Scans your workspace, groups them by type, and shows who last touched each line via git blame.

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For Businesses

Custom software. Direct contact.

Need an app, a web platform or a better way to run an existing workflow? I help you from technical planning through implementation. Short lines of communication and clear responsibility.

Discuss your project
Think clearly.
Build carefully.

Custom Software Development

Full-stack applications built around your actual workflows, not a generic template.

01

IT Consulting & Digital Strategy

Technical guidance on where to invest, what to build, and how to de-risk your roadmap.

02

Cloud Solutions & System Integration

Cloud-native infrastructure and reliable integrations with the tools you already run on.

03

Web & Enterprise Application Development

Modern web platforms and internal tools built to scale with your organization.

04

Software Architecture & Technical Consulting

Independent architecture reviews and hands-on guidance for teams building at scale.

05

Process Automation & AI-powered Solutions

Practical automation and AI features that remove manual work, not just add buzzwords.

06
Son Hai Vu, Hai Tech Solutions
Son Hai VuFounder & Software Engineer

About Us

Small. Independent. Personal.

I'm Son Hai Vu, the person behind Hai Tech Solutions. I build my own digital products and develop software for businesses. You talk directly to the person who actually builds your project.

Meet the founder
01

We build our own vision

02

Depth over breadth

03

Engineering-first culture

Contact

Get in touch

Questions, feedback, or just want to say hi? Send a message and we'll get back to you.

info@hai-tech-solutions.com