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btaq gmbh

Custom software engineering for your company

System integration · Mobile apps · AI engineering

Custom software for companies: integrations between business systems, apps for iOS and Android, and AI engineering for the Super Intelligence era. Experience in healthcare, retail, media and the public sector.

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15+Clients
35+Projects
20MDownloads
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Selected clients

Industry experienceHealthcare (ePA, gematik, FHIR) · Retail · Media · Public sector

what we do

We build digital products end-to-end.

Strategy, UI/UX design, project management and technology in one team, in three areas. For start-ups and Fortune 500 alike.

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01

System integration

We build custom software for mid-sized companies. For tasks that many companies share, we offer ready-made solutions that we adapt to your systems: first of all interfaces between HR software, payroll and time tracking.

  • Ready-made modules for HR, payroll and time tracking
  • REST API, SOAP web service, file import and export or database
  • Cloud or on-premises operation
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02

Mobile apps

From planning to live deployment and post-launch marketing, we handle the entire app lifecycle: iOS and Android, including patient-facing apps inside the German healthcare stack.

  • ePA (electronic patient record): frontend and whitelabel SDK
  • gematik specifications: MIO, eMP, AMTS, VAU+; FHIR data integration
  • BIK BITV / WCAG 2.1 AA accessibility
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03

AI engineering

We design and build AI automation for business processes: agents on Claude, Codex or local LLMs that prepare routine work, while people review and decide. We use the same tools in our own engineering, with human code review.

  • Multi-agent orchestration (Claude Code, Codex, MCP)
  • Local LLM inference (private, no data egress)
  • Human-in-the-loop architecture for regulated domains
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technology

Technology for system integration, mobile app development and AI engineering.

We pick the right stack per project. A selection of what we've shipped at scale.

AI / Agentic Stack

Claude Code · Codex · MCP · Multi-Agent Orchestration · Local LLMs · OpenRouter · Context Engineering · Agentic Retrieval · Human-in-the-Loop

iOS / Apple

Swift · Obj-C · SwiftUI · UIKit · Swift Concurrency · Combine · Core Data · GRDB · HealthKit · StoreKit 2 · WidgetKit · App Intents

Android / Cross-Platform

Kotlin · Jetpack Compose · Kotlin Multiplatform · Flutter · Java · C/C++ · TypeScript · Python

Engineering

MVVM · Coordinator · Clean Architecture · TDD · Unit / UI / Snapshot Tests · Code Review

Build / CI/CD

Xcode · SPM · Fastlane · GitLab CI · GitHub Actions · Xcode Cloud · Jenkins · SonarQube

Healthcare / TI

gematik specifications · ePA · MIO · eMP / AMTS · FHIR · VAU+ · BIK BITV · WCAG 2.1 AA · GDPR

Auth / Security

OAuth 2.0 · OIDC · netID · Sign in with Apple

Backend / Data

Vapor · Node.js · PostgreSQL · MySQL · SQLite · Redis · Docker · REST · GraphQL

For system integration, we connect applications through REST and GraphQL APIs and use OAuth 2.0 and OIDC for authentication. More on system integration →

career

Join the team.

Critical thinkers, exceptional doers, multifaceted creators. A place to realise your full potential and elevate your skills.

What we offer

01Personal development & growth

We encourage continuous learning and help each other accelerate growth and significantly boost skills.

02Dynamic and inspiring environment

Small team, high autonomy, no bureaucracy. Work directly with founders and senior engineers on production-grade products.

03Exciting projects with prominent customers

From Fortune 500 (IBM, EDEKA, RTL) to ambitious start-ups. You'll work on apps with millions of downloads and AI tooling for our own engineering.

04Flexible working conditions

Remote-first. Sensible hours. Outcome over output. We trust you to deliver.

05Technical training & equipment

Budget for hardware, books, courses and conferences. Access to the latest Claude, GPT, and self-hosted LLMs.

06Work-life balance

Sustainable pace. We're playing a long game, not burning out for the next sprint.

Open positions

Mobile Software Architect

Remote · Full-time / Freelance

Apply →

AI Engineering Consultant

Remote · Project-based

Apply →
team

The people behind btaq.

You talk directly to the people who plan, design and build your software.

Software Engineer & Founder

Paul

Senior Software Engineer & Founder. Focus: Mobile Apps and Agentic AI. Uses AI agents in development. Domains: Healthcare and system integration.

Graphic Designer & Content Creator

Tamara

Spectrum of UX/UI and graphic design work. Turns complex workflows into simple, clear and innovative designs, from concept through to production assets.

Product Owner & Concept

Martin

Plans and manages digital projects. Translates between business, design and engineering — the middleman that keeps complex projects shipping.

let's talk

How can we help?

Have a project, a role to fill, or a question? We respond within 24 hours.

Book a call
Project requestsproject@btaq.io
Careersteam@btaq.io
Location

Remote · Düsseldorf, Germany