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Stefan Valovic

@stefanvalovic

Senior fullstack (Java/Angular) engineer at Lubisoft s.r.o., building a paid mobile learning ecosystem with GenAI (Python/GoLang/React Native).

Slovakia

Message

At Lubisoft s.r.o., I built ChemiBuddy, VocabBuddy, and ChessCoachBuddy into a mobile learning ecosystem available on Google Play with paying customers. The apps use Go on AWS Lambda and React Native, and are localised into 56 languages.

I implemented a two-stage vision-model OCR pipeline, automated LLM post-processing, and multi-provider routing over OpenRouter with fallback chains and token-budget management. I also built SignalHub, a crypto-trading analytics platform in Python and FastAPI, with Binance and Kraken integrations and AI-based market-sentiment analysis.

My enterprise work includes cloud migration for a banking application for Tatra banka and microservice upgrades for T-Mobile Polska. I've also built and maintained systems for Deutsche Telekom, Swiss Re, SAP Slovakia, Fiserv and public-sector clients, using Java, Spring Boot, and Angular.

Experience

Work history, roles, and key accomplishments

Current

Founder, ChemiBuddy / VocabBuddy / ChessCoachBuddy

Current

Lubisoft s.r.o.

May 2026 - Present (5 months)

Built a mobile educational ecosystem available on Google Play with paying customers, using Go on AWS Lambda for the backend and React Native for the apps, localised into 40 languages. Implemented a two-stage vision-model OCR pipeline and multi-provider LLM routing over OpenRouter.

Go AWS Lambda React Native OpenRouter Vision OCR Claude Code JetBrains Junie Antigravity Aider LM Studio Ollama

Current

Founder, SignalHub (crypto trading analytics platform)

Current

Lubisoft s.r.o.

May 2026 - Present (5 months)

Built a standalone crypto-trading platform with Telegram integration in Python (FastAPI) and PostgreSQL, running in Docker on a VPS. Integrated Binance and Kraken APIs and implemented technical analysis indicators plus AI-based market-sentiment algorithms.

Python fastAPI PostgreSQL Docker Binance REST API Kraken API Technical analysis AI Driven Sentiment Indicators

Current

Founder & Senior Fullstack Developer

Current

Lubisoft s.r.o.

Jan 2020 - Present (6 years 9 months)

Founded and led a remote B2B contracting company, delivering fullstack and AI-native solutions for clients. Managed end-to-end product development and client engagements.

Go Python React Native AWS LLM Systems Fullstack Development B2B Contracting

Senior Java / Angular Engineer

Tatra banka & T-Mobile Polska

Oct 2025 - Aug 2026 (10 months)

Led the cloud migration of the ILLP Calculator banking application to AWS, including Spring Boot 3 upgrade, Angular 9 to 20, Oracle to PostgreSQL with distributed locking, and LDAP to Keycloak. Migrated T-Mobile Polska microservices from Spring Boot 2.7 to 3.5 and 4.1 and remediated CVEs through ArgoCD and GitLab CI/CD.

Java Spring Boot Angular AWS Oracle PostgreSQL Keycloak OAuth OIDC ArgoCD GitLab CI CD

Fullstack Developer, Viac ako učenie

Lubisoft s.r.o.

May 2025 - May 2026 (1 year)

Built a camp registration system with JetBrains Junie using Python AWS Lambda, DynamoDB, S3, and Angular 20, including parental signature capture and automated PDF generation. Rewrote the backend from Python Lambda to GoLang Lambda using Claude Code to resolve slow UI response times.

Python AWS Lambda DynamoDB S3 Angular 20 Go Claude Code JetBrains Junie PDF Generation

Cloud Architecture Consultant

Keystone-SDA-ATS AG

Dec 2025 - Feb 2026 (2 months)

Designed the GCP modernisation target for a legacy news portal, including Java 21, Quarkus, Vue.js/Nuxt.js, PostgreSQL, and Kubernetes.

GCP Java 21+Quarkus Vue.Js Nuxt.Js PostgreSQL Kubernetes

Senior Java Developer

Prosoft s.r.o.

Feb 2025 - Dec 2025 (10 months)

Maintained the secure backend of the national voting system using Java, Spring, Kubernetes, and Oracle.

Java Spring Framework Kubernetes Oracle

Senior Fullstack Developer

bol Behörden Online Systemhaus GmbH

Jan 2023 - Aug 2024 (1 year 7 months)

Developed web applications for German federal and municipal public-sector clients using Java 11–17, Spring Boot, Angular 16, and AWS Aurora.

Java Spring Boot Angular AWS Aurora

Senior Java Developer

Deutsche Telekom

Jan 2022 - Dec 2022 (11 months)

Built high-throughput non-blocking microservices using Spring WebFlux, Camunda BPM, ActiveMQ, Kubernetes, OpenShift, and GoLang.

Java Spring WebFlux (Reactive)Camunda BPM ActiveMQ Kubernetes OpenShift Go

Senior Fullstack Developer

Swiss Re AG

Feb 2020 - Nov 2021 (1 year 9 months)

Rewrote an AngularJS UI in Angular 11/12 and built a Java/Spring Boot, RabbitMQ, and Angular microservice on Azure DevOps and Kubernetes.

Angular Java Spring Boot RabbitMQ Azure DevOps Kubernetes

Software Engineer

SAP Slovensko

Jan 2013 - Dec 2018 (5 years 11 months)

Worked on SAP HANA Backup Service and System Landscape Directory in Java/Spring and C++.

Java Spring Framework C++

Senior Developer

NextIT

Senior developer role at NextIT.

C++ and GIS Developer

Normex

C++ and GIS development role at Normex.

C++GIS

C++ and GIS Developer

Animazoo

C++ and GIS development role at Animazoo.

C++GIS

C++ and GIS Developer

ArcGEO

C++ and GIS development role at ArcGEO.

C++GIS

Senior Developer

YMS

Senior developer role at YMS.

Senior Developer

First Data Resources

Senior developer role at First Data Resources.

C++ and GIS Developer

Hima Slovakia

C++ and GIS development role at Hima Slovakia.

C++GIS

Education

Degrees, certifications, and relevant coursework