Backend development (Java/Spring Boot) for a B2B automotive e-commerce platform: new services and maintenance of existing ones in production (product and price domains), Kafka, Azure infrastructure. Also built an LLM chatbot in Python, live in production for B2B customers.
Built and ran high-throughput Spring Boot microservices handling hundreds of RPS at low latency on Kubernetes with time-based autoscaling
Designed ScyllaDB schema for the first version of the product service (~10M products): denormalized tables with materialized views enabling both product-centric and vehicle-centric queries
Maintained the pricing services and added business and technical features: price caching (Redis, in-memory), logging and metrics, Kafka message processing into PostgreSQL with per-record failure isolation
Developed new microservices and deployed them with internal CI/CD templates; provisioned their Azure resources with Terraform: AKS namespaces, PostgreSQL, Key Vault
Operated live services: monitoring and alerting (Prometheus, Grafana, Kibana), scaling, troubleshooting issues and Kubernetes pods, technical support on customer requests
Java
Spring Boot
Kafka
PostgreSQL
ScyllaDB
Redis
Kubernetes
Docker
Terraform
Azure
Grafana
Kibana
E-commerce Chatbot(Python Engineer)
Developed LLM chatbot live in production for B2B customers: 550+ daily interactions across 6 European markets, LangGraph state machine with human-in-the-loop, integrated with Java microservices via async REST APIs
Designed RAG pipeline with FTS BM25 and token coverage rescoring for vehicle lookup; vector search for category matching; multiple Azure OpenAI models for conversation, tagging, and transliteration; function calling with Pydantic schemas
Built LLM observability (Langfuse, OpenTelemetry): cost tracking, latency monitoring, content safety via Azure mechanisms; cut LLM cost with token and per-user rate limits
Python
LangGraph
LangChain
Azure OpenAI
Tantivy
Langfuse
Pydantic
FastAPI
PostgreSQL
CopilotKit
Backend Developer @ Etteplan
Jun 2019 - May 2022
Java/Spring Boot development: smart metering platform (Diehl Metering) and network device management systems (Nokia)
Developed water leakage monitoring and energy forecast features for Diehl IZAR smart metering platform (Spring Boot, Elasticsearch); collaborated with international team and frontend developers
Implemented weather API integrations for energy analytics; Elasticsearch integration testing with TestContainers
Built server-side adapters for bulk network device management (Nokia)
Java
Spring Boot
Elasticsearch
TestContainers
Backend Developer @ ALTIMI
Aug 2016 - Sep 2018
Java/Spring backend for Nokia network management systems
Developed server-side adapters using Nokia's internal framework for managing network devices (routers, switches, network servers)
Contributed to web application integrating Heating/Cooling modelling tool: Java backend, MS SQL, and JavaScript/jQuery frontend
Java
Spring
MS SQL
JavaScript
Software Development Engineer @ Gigaset
May 2015 - Jul 2016
Product-focused smart home team (~20 people): backend for IoT device-software system (sensors, sirens); separate Cordova mobile project
Built real-time alert microservice processing sensor events (motion, door/window, smoke) with RabbitMQ; push notifications handled by separate microservice
Cordova mobile app modifications and deployment to Google Play and App Store
Java
Play Framework
RabbitMQ
Cordova
Android/Backend Developer @ A.T.S. S.A. / XTYPE
Oct 2012 - Apr 2015
Java development: Android applications and backend APIs
Built Android TV apps (Java) on custom Android OS for digital signage; optimization and troubleshooting of custom OS issues
Backend APIs: Java/Play Framework and PHP; push notifications with GCM
Android
Java
Play Framework
PHP
Developer @ Earlier Roles
Jan 2010 - Aug 2012
Python/Django, Android, and PHP development at various companies; also developed own applications
Side projects: launched Django web app with growing user base; built profitable Android app
Python
Django
Android
PHP
HTML
CSS
Education
Master's degree, Computer ScienceUniversity of Silesia, Katowice
2006 - 2011
Professional Training, Trainer Development ProgramSchool of Trainers
2018 - 2019
Professional Training, CoachingSchool of Coaching
2016 - 2017
Certificates
AI_devs 4 - BuildersAI_devs
2026
AI_devs 2 & 3 - Building AI Agents & GPT-4 IntegrationAI_devs