Available for freelance work · Remote

Why me?

I design scalable solutions that deliver business value.

7+
Years of Experience
4+
Years in Production Backends
30+
Production Services Delivered
15+
Technologies Mastered

Production-Ready

4 years shipping scalable solutions for blockchain, AI, and IoT systems. More than 7 years of coding experience overall

Versatile Tech Stack

Polyglot developer: TypeScript, Go, PHP, Kotlin, Python - choosing the right tool for each challenge

Bleeding Edge

Pioneering implementation of zk-SNARKs for privacy in smart-contract flows, plus on-premise ML and LLM deployments

Cloud & DevOps

Azure, AWS, Terraform, Grafana, New Relic, CI/CD - infrastructure as code, production monitoring

About me

A quick, concrete overview of how I work and what you get when we collaborate.

Ownership & delivery

I take work from idea to production: clear scope, reliable rollout, and a stable system afterwards.

Pragmatic engineering

Clean architecture where it matters, fast iteration where it helps - with tests, docs, and sane defaults.

Production mindset

Observability, cost-awareness, and reliability are part of the feature, not an afterthought.

Case studies

A few real examples: the problem, the approach, and the outcome.

AI assistant backend from scratch (Vaiot.ai)
API · Integrations · Data pipelines · Production rollout
▾
Problem
Deliver a reliable backend for an AI assistant with multiple integrations and evolving requirements.
Approach
  • ▸ Designed API boundaries, validation, authentication, and integration points
  • ▸ Implemented data ingestion/sync with idempotency and retries
  • ▸ Added observability (logs/metrics) and deployment automation
  • ▸ Integration of Azure CLU and OpenAI with RAG
Outcome
  • ▸ Faster iteration without breaking production
  • ▸ More predictable deployments and easier debugging
  • ▸ A base architecture that scales with new features
TypeScriptNode.jsRedisDockerCloudCI/CD
Unified email delivery service (Vaiot.ai)
Multi-project platform · Cost control · Deliverability
▾
Problem
Multiple products needed email sending with consistent templates, tracking, and lower costs.
Approach
  • ▸ Built a shared service with standardized templates and routing
  • ▸ Added queues/retries and monitoring for deliverability issues
  • ▸ Provided a simple API so teams could integrate quickly
Outcome
  • ▸ Reduced duplication across projects
  • ▸ Improved reliability of notifications
  • ▸ Lowered operational overhead and vendor dependence
Node.jsTypeScriptNest.jsGraphQLQueuesObservability
Cash payments in IoT vending machines (Selfibox)
Hardware integration · Edge constraints · Reliability
▾
Problem
Implement a robust cash payment flow across devices (acceptors, receipts) in the field.
Approach
  • ▸ Modeled device state machines and failure scenarios
  • ▸ Implemented safe retries and reconciliation for transactions
  • ▸ Integrated receipt printing and end-to-end monitoring
Outcome
  • ▸ More stable on-site sales flows
  • ▸ Fewer manual interventions for operators
  • ▸ Clearer incident diagnosis when devices misbehave
MQTTRedisTypeScriptNest.jsPHPIoT
Payment gateway: crypto + Stripe + Przelewy24 (Vaiot.ai)
Unified payments · Webhooks · On-chain integration
▾
Problem
Support multiple payment providers (crypto + card + local transfers) with a consistent status model, safe retries, and direct blockchain integration.
Approach
  • ▸ Implemented a unified payment abstraction (create/confirm/refund) across providers
  • ▸ Handled webhooks with signature verification + idempotency keys to prevent double-processing
  • ▸ Integrated on-chain confirmation directly into the gateway (smart-contract events → payment status)
  • ▸ Added reconciliation and alerting for mismatched states and edge cases
Outcome
  • ▸ Fewer payment-related incidents and faster debugging
  • ▸ Consistent payment UX across products and teams
  • ▸ Safer rollouts with deterministic retries and audits
TypeScriptNest.jsNode.jsStripePrzelewy24WebhooksRedisSmart contracts
DDRS backend (Vaiot.ai)
Integrations · Data sync · Reliability
▾
Problem
Build and evolve a production backend with external integrations and frequently updated domain data.
Approach
  • ▸ Designed APIs and data flows with caching and rate limiting where needed
  • ▸ Implemented robust sync jobs (retries, backoff, idempotency) for external data sources
  • ▸ Improved observability and operational readiness (dashboards, alerts)
Outcome
  • ▸ More stable operations under changing data and integrations
  • ▸ Lower mean time to detect/resolve incidents
  • ▸ A maintainable platform for further feature development
TypeScriptNest.jsNode.jsRedisIntegrationsMonitoring
On-prem AI for kiosks: vision + voice + RAG agents (Selfibox)
Computer vision · STT/TTS · RAG · Edge / on-prem
▾
Problem
Add reliable AI features to kiosk workflows under edge constraints (latency, offline tolerance) while keeping operations predictable.
Approach
  • ▸ Implemented vision processing with YOLOv9 for detection/verification in the flow
  • ▸ Added speech-to-text via faster-whisper and text-to-speech via XTTSv2 + Chatterbox for natural interactions
  • ▸ Built AI agents with RAG using Gemini 2.5/3; embeddings via granite-embedding:278m and multilingual-e5-base for fast local retrieval
  • ▸ Designed the architecture for on-prem deployment: cache, retry, and observability for operators
Outcome
  • ▸ Full voice support and user guidance through fortune-telling flows
  • ▸ Greater automation and fewer manual interventions
  • ▸ More stable operation thanks to edge-friendly architecture and monitoring
YOLOv9faster-whisperXTTSv2ChatterboxGemini 2.5/3RAGgranite-embedding:278mmultilingual-e5-base

FAQ

What roles are you a best fit for? ▾
Backend / fullstack roles where you want someone to fully own APIs, integrations, cloud, and production operations - taking work off your plate instead of adding management overhead.
How do you communicate progress? ▾
Short written updates, clear milestones, and early risk flags - so you always know what is shipped, what is in progress, and where I need input, without micromanagement.
Do you work well with existing codebases? ▾
Yes - I focus on safe, incremental improvements: refactors with tests, improved observability, and cleaner boundaries, while respecting existing constraints and team conventions instead of pushing risky rewrites.
What do you need from the team to be effective? ▾
Clear priorities, access to environments/metrics, and a feedback loop with product and stakeholders. Beyond that, I work autonomously and protect your time, bringing you options and trade-offs instead of raw problems.
What kind of projects energize you? ▾
Systems with real constraints: scale, reliability, integrations, privacy/security, and AI/LLM features that ship - especially where a senior engineer can take long-term ownership and become the go-to person for that area.
How do you work with non-technical stakeholders or clients? ▾
I translate technical constraints into clear options, risks, and impact on timelines or budget. With clients and product, I focus on "what problem are we solving" and propose pragmatic solutions instead of throwing jargon.
Can you support hiring or vendor decisions? ▾
Yes - I can help design practical coding tasks, participate in interviews, review architectures, and give you a second opinion on vendors or proposals, focusing on long-term maintainability and total cost of ownership.

If you need someone who can architect, build, and operate production systems - I’m a good fit.

Let's talk

Experience

From blockchain to IoT, AI to cloud infrastructure - real production systems at scale

Blockchain · AI · Legal Tech Jan 2023 - Jan 2026

Backend Developer

VAIOT.ai

Remote (Warsaw)

Node.jsTypeScriptGoKotlinPHPNestJSLaravelJestSupertestMicroservicesRedisMongoDBAzureAWSTerraformDockerCI/CDGitHub ActionsOpenAIAzure CLURAGUML
  • ▸ Designed and developed production backends (monolith + microservices) powering blockchain transactions
  • ▸ Architected and built from scratch the backend for assistant.vaiot.ai and ddrs.vaiot.ai (API, integrations, data pipelines)
  • ▸ Co-created, maintained, and delivered new backend features for legaltorch.mt / legaltorch.pl and firmowy-prawnik.pl (originally vendor-built, but I took over feature development and stability)
  • ▸ Implemented an invoicing system integrated with legal processes and on-chain transactions
  • ▸ Built a Twitter/X & Telegram raffle system: wallet linking, token rewards, bot detection/removal
  • ▸ Developed internal tools for legal assistant: automated synchronization of settings, regulations, rulings, and judgments
  • ▸ Built a unified email service for all projects-cost-effective, reliable, and scalable (Mailchimp was too expensive)
  • ▸ Co-developed a universal crypto payment service (VAI, ETH) used across multiple products and teams
  • ▸ Pioneered zk-SNARK / SK-SNARK implementation for contract privacy and data certification
  • ▸ Managed cloud infrastructure (Azure/AWS) with Terraform and CI/CD; heavy Redis usage (cache/queues/sync) and MongoDB
IoT · Vending Machines Jan 2022 - Present

Fullstack Developer

RSvend Sp. z o.o. / Selfibox

Remote (Wrocław)

Node.jsTypeScriptPHPGoPythonNestJSLaravelStrapin8nFlutterJestMQTTRedisDockerYOLOv9faster-whisperXTTSv2ChatterboxGeminiRAGLLaMAOllamaUML
  • ▸ Built and maintained backend + frontend systems for vending machine networks (photo souvenirs)
  • ▸ Designed and implemented a cash payment system for vending machines (acceptors, and sales flow integration)
  • ▸ Designed and implemented receipt generation and printing system (integration with physical devices)
  • ▸ Planned, managed, and deployed end-to-end kiosk solutions for fairs and events
  • ▸ Planning, management, and end-to-end deployment of kiosks for order handling at fairs and events
  • ▸ Developed embedded/IoT-like software with MQTT communication and Redis state synchronization
  • ▸ Fine-tuned and deployed Gemini 2.5/3; trained local LLMs (LLaMA, Ollama, LangChain) for edge/on-prem scenarios
Web · Desktop Applications Sep 2020 - Jan 2022

Fullstack Developer

Prywatna Agencja Wywiadowcza Redigo Sp. z o.o.

Wrocław

PHPLaravelTypeScriptPostgreSQLAlpine.jsPython
  • ▸ Built and scaled web applications based on Laravel
  • ▸ Created an application encrypting and synchronizing data between agency computers
  • ▸ Optimized performance and SEO of existing services (SEO + performance)
Web · Consulting Nov 2018 - Dec 2021

Freelance Developer

Remote

PHPTypeScriptSvelteKitStrapiLaravelPythonTailwind
  • ▸ Delivered websites and web applications for individual clients and small businesses
  • ▸ Built scraping, automation, and integration tooling in Python
  • ▸ Delivered additional services: video/ad editing, simple graphics, occasional 3D rendering

Ready to bring this experience to your team? Let's talk.

Get In Touch

Side Projects

Beyond work hours - exploring new technologies and building for fun

Multi-Server Music Bot

Mumble + Discord music bot with multi-server support and advanced audio streaming

JavaScript/Node.js/Audio Streaming

Encrypted VoIP Communicator

End-to-end encrypted voice communication application

Java/Cryptography/Networking
Google Play

Crochet It

Mobile app for tracking crochet project progress. Published on Google Play

Dart/Flutter/Mobile

Custom E-commerce Platform

Building a modern e-commerce platform from scratch

Private project - architecture available upon request

TypeScript/Node.js/Svelte/PostgreSQL

Like What You See?

I'm always exploring new ideas. Let's build something great together.

Let's Work Together

Beyond Code

AI & Blockchain technologies ·Photography ·Music production ·Animals ·CAD/CAM design and 3D printing

Let's Build Something Together

Open to new opportunities · Remote work · Freelance projects

Email
***************
Phone
***************
Location
Prudnik
LinkedIn
michaldolchon

Ready to Scale Your Project?

Whether you need a backend architect, a full-stack developer, or a technical consultant - I'm here to help transform your ideas into production-ready solutions.

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© 2026 Michał Dołchoń · Crafted with Astro & Svelte