Senior Backend Developer / Architect

Matúš
Seidl.

For more than 10 years, I have designed and built backend systems, mobile products, and cloud solutions. I understand the detail while making decisions for the whole.

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2014
Android 2020
DONIT 2026
Java / Cloud

10+years building
software

Java · Spring Boot · Flutter · AWS · GCPBuild / run / repeat

01 / Profile

Technical detail.
Product perspective.

I do my best work where writing code is only part of the job. I want to understand the domain, find the right trade-off, and take the solution all the way to production.

Now: RealGarant — RPG/LE → Java
Before: BMW enterprise mobile platform
Outside work: Running, movement, and personal products

02 / Career

Work log

From the first Android build to modernizing enterprise systems.

2025 — present

EXXETACurrent

Senior Backend Developer

RealGarant · RPG/LE → Java modernization

I analyse legacy RPG code and transform it into maintainable Spring Boot services, covering domain design, integrations, data transformations, and architectural decisions.

Java
Spring Boot
Microservices
SQL
Docker

2024 — 2025

EXXETA

Backend & Mobile Developer

BMW · enterprise mobile platform

Backend services, REST APIs, and system integrations for a BMW mobile product, including technical support for the Flutter application and close collaboration with the mobile team.

REST
Flutter
Docker
AWS
GCP

2020 — 2024

DONIT / FREELANCE

Architect · Team Lead · Developer

Products from the first design to production. Backend, mobile development, DevOps, team leadership, and technical decision-making for small companies and growing platforms.

Spring Boot
Flutter
Kubernetes
GCP
PostgreSQL

2016 — 2020

QBSW, a.s.

Java Developer · Team Leader

Enterprise Java application development and delivery team coordination across the IIHF, Booyang, Lampiris, and DOCKitIN projects.

Java
Spring Boot
Kafka
AWS
Camunda

2015

SIEMENS

Android Developer · Freelance

Resolved critical issues in existing Android applications.

Android
Java

2014 — 2015

TOUCH4IT

Android Developer

Started as an intern and progressed into an Android developer role.

Android
Java

03 / Projects

Selected
builds

Products that made it into the real world.

Rebbid

A property rental management platform covering the journey from listing to ongoing service.

Architect · Team Lead · DevOpsSpring Boot · Flutter · Kubernetes · GCP

Lexio

An AI assistant for legal documents that answers from verifiable Slovak law context and helps locate relevant provisions.

Design · Full-stack · AI/RAGJava · Spring Boot · AI / RAG · Tailwind CSS

AudioShelf

An offline audiobook player for your own library, without ads or subscriptions.

Product developmentFlutter · Mobile

country_codes_plus

An adopted and actively developed open-source Flutter package for country and locale data, ISO codes, calling codes, and search.

Maintainer · Open-source developmentFlutter · Dart · ISO 3166 · CLDR

SmartAngler

A fishing logbook with GPS tracking, maps, and analytics.

Architect · Backend & MobileSpring Boot · Flutter · AWS · MongoDB

—

Semileas

A distribution system for the healthcare sector.

Backend Developer · ConsultantSpring Boot · Vaadin · AWS · PostgreSQL

—

Riešime bývanie

An internal real estate system and mobile application for client-facing workflows.

Backend & Mobile developmentMobile · Backend

Plaze

A map-based social mobile application.

Backend & Flutter DeveloperSpring Boot · Flutter · AWS

—

04 / Stack

Working toolkit

Core

Java · Spring Boot · REST API · Microservices · SQL

Cloud & delivery

AWS · GCP · Docker · Kubernetes · CI/CD · Jenkins

Data & messaging

PostgreSQL · MongoDB · Redis · Kafka · ElasticSearch

Product

Flutter · Dart · GraphQL · Stripe · Strapi · GIS

05 / Education

2015 — 2018

Master's degree · Applied Informatics

Slovak University of Technology in Bratislava

2012 — 2015

Bachelor's degree · Applied Informatics