Hi 👋🏻, I'm Tobias Leinss.
I build privacy-first apps you can install today.

I design and ship small, focused apps that run on your own device. Most of them work fully offline; the AI features are optional and use a key you bring yourself. No accounts, no telemetry, no backend collecting your data.

• TobiBoard Android
  On-device Android keyboard with optional bring-your-own-key AI voice-to-text and text fix.
• TobiReader Android
  Local-first RSS/Atom reader with on-device read-aloud, optional AI summaries and self-hosted sync.
• TobiRecord macOS · Windows · Linux
  Open-source screen recorder and editor with auto-zoom, cursor polish and styled frames.
• TobiVoice macOS
  Native macOS voice-to-text that transcribes locally — offline processing, your data never leaves the device.
• TobiBar macOS
  macOS menu-bar manager — hide, show and organise menu-bar items, with a growing toolbox of extras.
• kAIros iOS · Android
  AI-guided goal tracking — conversational goal setup, reminders and progress with local-LLM integration.
• finanzplanr Web · Mobile
  Financial planning platform for the DACH region — household budgeting, statement parsing and AI insights.
• taggr Web (self-hosted)
  Self-hosted, AI-powered image tagging — bulk auto-tagging with a local LLM, all data stays on your machine.

👋 A little about me

I build custom-tailored software and the infrastructure behind it, end to end: AI integration and automation, mobile and desktop apps, web platforms, and the self-hosted infrastructure that runs them. I care about software that respects the people using it — local-first, transparent about what leaves the device, and pleasant to use.

Before focusing on my own apps I spent years building Web3 and AI systems for companies and teams — smart contracts, backends, devops and AI integration. That background still shows up in the apps.

🤖 AI consulting

The apps above are proof I can take an idea and ship it end to end. If your company needs that same delivery for custom-tailored (maßgeschneidert) work — AI and automation, plus the self-hosted infrastructure behind it — I take that on through Leinss Consulting: LLM assistants and chatbots, process automation, and the backends and devops to run them privately. If that's a fit, let's talk.

• Jul 2024 - Jan 2025
  datalatte.com
  Software Engineer

  Lead Dev., UI (Farcaster Frames), backend (telegram bot, AI for extraction, summarization and generation, data pipelines), software architect, devOps eng.

  Among others:

  match making

  Implementation of a match making mechanism for event participants, e.g. for conferences or meetups based on their public social media presences. Profiling participants through data & AI pipelines and matching similar participants with algorithms.

  datalatte.com

• Dec 2022 - Jun 2024
  blockscape.network
  Software Engineer Blockchain

  DevOps Eng. in the Ethereum & Cosmos ecosystem. Automation tools in Golang & Rust.

  blockscape.network

  reporting tool

  Implementation of a financial reporting tool of all past transactions in a certain episode for the Ethereum & Cosmos ecosystem written in Rust.

  automation tooling

  Implementation of a restaking, governance and balance & stake alerting system for the Cosmos ecosystem written in Golang.

• May 2022 - May 2022
  Udacity
  Blockchain Developer nanodegree
• Oct 2021 - Nov 2021
  Scrum Alliance
  Scrum Master
• Jan 2019 - May 2022
  Freecodecamp Certificates
  Frontend Development Libraries, Data Visualization, Responsive Web Design, Backend Development and APIs, JavaScript Algorithms and Data Structures

🤝 Let's connect

• bluesky /
• github /
• linkedin /
• dev@leinss.xyz