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.

• TobiBoardAndroid
  On-device Android keyboard with optional bring-your-own-key AI voice-to-text and text fix.
• TobiReaderAndroid
  Local-first RSS/Atom reader with on-device read-aloud, optional AI summaries and self-hosted sync.
• TobiRecordmacOS · Windows · Linux
  Open-source screen recorder and editor with auto-zoom, cursor polish and styled frames.
• TobiVoicemacOS
  Native macOS voice-to-text that transcribes locally: offline processing, your data never leaves the device.
• TobiBarmacOS
  macOS menu-bar manager: hide, show and organise menu-bar items, with a growing toolbox of extras.
• kAIrosAndroid
  AI-guided goal tracking: conversational goal setup, reminders and progress with local-LLM integration.
• finanzplanrWeb · Mobile
  Financial planning platform for the DACH region: household budgeting, statement parsing and AI insights.
• taggrWeb (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.

• TobiTerm

  An Android terminal for driving coding agents on remote machines: a mosh session that survives the walk to the train, with the phone parts a laptop workflow assumes you have.
• TobiSound

  A native Android music player for your own media servers and local files: gapless playback, offline downloads, Chromecast, Android Auto and TV, with no accounts and no telemetry.

• Oct 2025 - Present
  Gnosis
  Senior Backend Engineer

  Backend services and the full infrastructure behind the Circles protocol.

  gnosis.io

  infrastructure

  Multi-host platform driven by Ansible: blockchain nodes, PostgreSQL with automated failover and streaming replication, connection pooling, reverse proxy and TLS, firewalling, and rolling deploys across staging and production.

  observability

  Hub-satellite monitoring stack: Prometheus, Loki, Grafana, Tempo and Alertmanager: with remote-write from the satellites, central log shipping, and alerting on node, database and endpoint health.

  backend

  Services and tooling around the protocol: APIs, indexing, and data access.

• Feb 2025 - Present
  leinss-consulting.de
  Founder & Independent Consultant

  Consultancy delivering web products and process automation, run end to end from the productized offering through to delivery.

  leinss-consulting.de

  product delivery

  A production e-commerce storefront, a back-office product management application, and an events site, on PostgreSQL with row-level security, object storage and continuous deployment.

  integration

  Integration with a separately owned supply-chain system, so data moves between the two without manual re-entry.

• 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

Questions about an app, an invite to a beta, or a consulting project? Reach out by email or find me on the networks below.

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