Senior Flutter Developer · Wrocław, Poland

Patryk
Kwiecień

10+ years building cross-platform apps for iOS, Android, Web & Linux. Co-founder of aisay.co — an AI-powered AAC platform helping non-verbal children communicate. Expert in Clean Architecture, BLoC/Cubits & LLM integrations.

Available for new projects
Flutter Clean Architecture AI · LLM iOS · Android · Web aisay.co Wrocław, Poland
Patryk Kwiecień
// patryk.kwiecień
Scroll

Tech Stack

01 / Mobile
Flutter & Dart
FlutterDart iOSAndroid WebLinux Clean ArchBLoC / Cubits Riverpodgo_router GetIt / Injectablefreezed drift
02 / AI / ML
AI Integration
OpenAI · GeminiLLM streaming WhisperTFLite RAG pipelinesEmbeddings On-device inferencePrompt eng.
03 / Backend
Back-end & APIs
Node.jsExpress.js TypeScriptREST / GraphQL WebSocketsPostgreSQL JWT / OAuth2PHP
04 / DevOps
Cloud & DevOps
FirebaseAWS GCPDocker CI/CDGitHub Actions JenkinsSentry Crashlytics

AI Engineering

I don't just call an API — I ship AI products end-to-end. From co-founding aisay.co (a real-time AI voice engine helping non-verbal children speak) to generating ~15,000 AAC symbols with AI and building a full TypeScript MCP server, my focus is taking LLMs from prototype to production, on mobile, web and on-device — with the architecture, latency and cost discipline a shipped product demands.

~15k
AI-generated AAC symbols
2
AI products live in stores
Real-time
Streaming voice & LLM engine
MCP
TypeScript server in production
01 / Integration
LLM Apps & Assistants

Production integrations with OpenAI, Gemini & Claude — token streaming, function/tool calling, structured output and graceful fallbacks. Built right into Flutter & Node.js apps with proper error, cost and rate-limit handling.

OpenAIGemini ClaudeStreaming Tool calling
02 / Retrieval
RAG & Knowledge Systems

Context-aware assistants grounded in your own data — embeddings, vector search, chunking strategies and retrieval pipelines that cut hallucinations and keep answers accurate, current and on-brand.

RAGEmbeddings Vector searchPipelines
03 / Edge
On-device & Offline AI

Privacy-first, low-latency inference that runs without a network — TFLite models, on-device Whisper speech-to-text and quantized pipelines for mobile, desktop and Linux. Ideal where data can't leave the device.

TFLiteWhisper On-deviceQuantization
04 / Tooling
MCP Servers & AI Agents

Custom Model Context Protocol servers and agent tooling that let LLMs safely act on your systems — the exact stack behind aacstandard.com's TypeScript MCP integration and its AI symbol-generation API.

MCPAI Agents TypeScriptTool APIs
05 / Voice & Multimodal
Voice, Speech & Generation

Real-time AI voice engines, speech-to-text and text-to-speech, plus AI image/symbol generation — the production tech proven in aisay.co, serving non-verbal users with natural, context-aware responses.

AI VoiceSTT / TTS Image genRealtime
06 / Strategy
From Prototype to Product

Co-founder experience taking AI from idea to App Store — prompt engineering & evaluation, latency & cost optimisation, Clean Architecture and the CI/CD to ship it. Including ObywatelBielik, Poland's first open-source LLM project.

Prompt eng.Evals Cost / latencyOpen-source LLM
Have an AI idea — or a half-built one that needs to ship? Let's talk AI

Work Experience

Jun 2023 – Present
Sonel
Senior Flutter Developer
  • Leading mobile & desktop (Linux) app development in Flutter for industrial measurement equipment.
  • Defining system architecture, release pipeline and CI/CD strategy for cross-platform builds.
2025 – Present
ObywatelBielik
Senior Flutter Developer
Volunteering · ObywatelBielik
  • Leading mobile architecture for Poland's first open-source LLM project.
  • Designing Flutter SDK patterns for the contributor team.
Jun 2021 – May 2023
Credit Agricole
Senior Flutter Developer
  • Developed core banking features in Flutter for the CA mobile app.
  • Led performance refactoring across key user flows on Android and iOS.
Aug 2019 – Jun 2021
Deviniti.com
Mobile / Front-End Developer
  • Built mobile and web apps in Flutter, Angular and Java.
  • Maintained CI/CD via Jenkins, Docker and Vagrant; administered Linux servers.

Featured Projects

Get in touch

Open to senior Flutter roles, AI integration projects, and co-founder opportunities. Based in Wrocław, available remotely.