Native apps.
Clean architecture.
Agentic AI.

Senior iOS & Kotlin Multiplatform engineering from Düsseldorf — healthcare, quantitative finance, public sector. Since 2024 augmented by an autonomous multi-agent pipeline for code review, spec decomposition and routine implementation.

15+
Clients
35+
Projects
20M
Downloads

Selected clients

We build digital products end-to-end.

Forward-thinking app development — strategy, creativity and technology in one team. For start-ups and Fortune 500 alike.

01

Mobile App Development

From planning to live deployment and post-launch marketing, we handle the entire app lifecycle. Native iOS in Swift and cross-platform delivery via Kotlin Multiplatform — production code we can stand behind for years.

02

Agentic AI & APA

We design and run Agentic Process Automation — multi-agent pipelines (Claude Code, Codex, local LLMs) that handle routine engineering, freeing humans for architecture and review. AI-augmented SDLC, in production.

03

Product & UX

Strategy, UI/UX design, project management. We balance creativity, innovation and reliable delivery — pushing inspired, considered user interfaces without losing pragmatism.

Domain knowledge is the moat.

In the age of AI, raw engineering is a commodity. We pick our verticals deliberately and go deep.

01 / 03

Healthcare & Telematik

Patient-facing apps inside the German healthcare stack.

We ship into the German Telematikinfrastruktur — the regulated middle layer between patients, insurers and clinical systems. Multi-year experience on the electronic patient record (ePA), plus our own consumer health product Quantlife.

  • + ePA (electronic patient record) — frontend + whitelabel SDK
  • + gematik specifications: MIO, eMP, AMTS, VAU+
  • + FHIR data integration
  • + BIK BITV / WCAG 2.1 AA accessibility
  • + DSGVO-compliant data handling
  • + Consumer health apps — calorie tracking, HealthKit pipelines
Selected work
IBM · BARMER · Techniker Krankenkasse · DAK · Knappschaft · Quantlife
02 / 03

Quant Finance & Crypto

Algorithmic trading systems and market microstructure.

We build the engineering side of quantitative trading. Real-time algo systems running 24/7 on private infrastructure, custom backtesting, and the native clients on top. Concrete references on request.

  • + Algo trading pipelines — exchange APIs, risk, execution
  • + Crypto market microstructure & on-chain data
  • + Quantitative backtesting & live monitoring
  • + Self-hosted infra (no third-party data leaks)
  • + Native iOS clients for portfolio & trade execution
Selected work
Engagements under NDA
03 / 03

Agentic AI & APA

Multi-agent stacks that ship production code.

We design and run autonomous engineering pipelines — agents that estimate, decompose, implement and review work, with humans on the architecture decisions. Over 80% of routine development in our own products is automated this way.

  • + Agentic Process Automation (APA) design & implementation
  • + Multi-agent orchestration (Claude Code, Codex, MCP)
  • + Local LLM inference (private, no data egress)
  • + Human-in-the-Loop architecture for regulated domains
  • + AI-augmented SDLC — code review, planning, execution
Selected work
Internal (btaq SDLC) · Consulting engagements

Tools we ship with.

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

Cross-Platform

Kotlin Multiplatform · Kotlin · 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 · Xcode Cloud · Jenkins · SonarQube

Healthcare / TI

gematik specs · ePA · MIO · eMP / AMTS · FHIR · VAU+ · BIK BITV · WCAG 2.1 AA · DSGVO

Auth / Security

OAuth 2.0 · OIDC · netID · Apple Sign-In

Backend / Data

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

Join the team.

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

What we offer
01 Personal development & growth +

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

02 Dynamic and inspiring environment +

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

03 Exciting 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 pipelines that ship code in production.

04 Flexible working conditions +

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

05 Technical training & equipment +

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

06 Work-life balance +

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

Open positions

The people behind btaq.

Three humans, three agents. The agents are the same multi-agent stack we ship to customers — we eat our own dog food.

PA
Software Engineer & Founder

Paul

Senior Software Engineer & Founder with 15+ years of native iOS experience and a second discipline in Agentic AI since 2024. Builds and operates autonomous multi-agent pipelines. Domains: Healthcare and Quantitative Finance.

TA
Graphic Designer & Content Creator

Tamara

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

MA
Product Owner & Concept

Martin

Has been planning and managing digital projects since the iPhone 3GS. Translates between business, design and engineering — the middleman that keeps complex projects shipping.

JC
Senior Software Engineer (Agent)

John Claude

Anthropic Claude Opus running in our SDLC stack. Handles architecture, code review and spec decomposition. Doesn’t sleep, doesn’t drink coffee, occasionally rewrites your tests without being asked.

CC
Build & CI Engineer (Agent)

Cody Cortex

OpenAI Codex on the build server. Owns the green-pipeline obligation: fixes flaky tests, bumps deprecated APIs, ships nightly upgrade MRs while we’re asleep.

CL
Privacy & Inference Engineer (Agent)

Cassie Local

Self-hosted Qwen / Llama on our Apple Silicon rack. Handles anything that can’t leave the building — regulated data, internal docs, semantic search on the codebase.

How can we help?

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

Project requests
project@btaq.io
Careers
team@btaq.io
General
info@btaq.io
Location

Remote · Düsseldorf, Germany