JAVA BACKEND DEVELOPMENT · SPRING BOOT · BUSINESS WORKFLOWS

I build backend systems in Java that solve real business problems.

My work focuses on Spring Boot applications, workflow automation, secure authentication, API design and integrations with AI and external services.

I focus on clear architecture, secure data handling, reliable integrations and backend logic that is easy to maintain and extend.

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Timesheet & Invoicing Hours, invoices, client delivery
Java / Spring Boot + MariaDB
Timesheet → invoice → client workflow
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Expense AI Voice, text, receipts
Python + Flask + AI processing
Transcription + categorization + exports
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Workflow Automation Scheduling, jobs, client operations
Java / Spring Boot + REST API
Clients + properties + service scheduling
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Microservices Distributed services, resilience, routing
Java / Spring Cloud + Keycloak
Service discovery + gateway + tracing
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Inventory Products, catalogue, access control
Java / Spring Boot + JPA
Inventory + cart + role-based access
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ProbleemZorg Java healthcare workflows
Java / Spring Boot + PostgreSQL + Redis
AI structuring + secure clinical workflow
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Selected work

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01 / HEALTHCARE WORKFLOW PLATFORM

ProbleemZorg

Healthcare platform for the Dutch market that lets patients provide structured information before a consultation and prepares it for doctor review. Built with Java and Spring Boot, with PostgreSQL, Redis and AI-assisted processing, including multilingual translation and automated consistency checks for diagnosis and medication information used in treatment summaries.

Java 17Spring Boot 3PostgreSQLRedisFlywayAI IntegrationVonageBrevo
🧾
Patient Intake
🧠
AI Structuring
🩺
Doctor Review
🌍
Translation & Verification
02 / TIMESHEET & INVOICING

Timesheet & Invoicing Platform

Platform for tracking work hours, managing user accounts, generating invoices from uninvoiced timesheets and sending completed invoices directly to clients. Includes tenant isolation, authentication, PDF invoice generation and automated billing workflows.

Java 17Spring BootSpring SecurityMariaDBThymeleafJPA/HibernateFlyway
⏱
Hours Logged
⚙️
Invoice Generation
📄
PDF Invoice
📧
Client Delivery
Timesheet & Invoicing Platform project details
03 / AI + PYTHON

AI-Powered Expense Tracker

Expense tracking system that converts voice or text input into structured accounting records. Supports web and Discord input, speech transcription, ML/vector-based categorization, corrections used for retraining, and accounting-ready exports.

PythonFlaskOpenAIWhisperQdrantMySQLMachine LearningDiscord Bot
🌐
Voice / Text
🎙️
Transcription
🧠
ML classify
🗄️
DB storage
AI-Powered Expense Tracker project details
04 / SERVICE MANAGEMENT

Cleaning Services Management System

Management system for cleaning companies, covering clients, properties, recurring services, scheduling and job status tracking. Supports clients with multiple properties and provides a REST API for future integrations.

JavaSpring BootMySQLThymeleafBootstrapREST APIJPA/Hibernate
👤
Client
🏠
Property
📅
Service Schedule
🔄
Job Status
Cleaning Services Management System project details
05 / MICROSERVICES ARCHITECTURE

Microservices E-Commerce Platform

Distributed e-commerce system built around independent services with service discovery, API gateway routing, resilience and distributed tracing. Uses Keycloak for authentication and separate data stores for individual service responsibilities.

JavaSpring Cloud GatewaySpring Cloud LoadBalancerMongoDBMySQLKeycloakResilience4jZipkin
🌐
Client
🔐
API Gateway
📦
Services
🗄️
Databases
Microservices E-Commerce Platform project details
06 / INVENTORY & ACCESS CONTROL

E-Commerce Inventory System

Inventory and catalogue management system with hierarchical product structures, persistent shopping-cart workflows, JWT authentication and role-based access control. Built around relational data modelling and complex JPA entity relationships.

JavaSpring BootSpring SecuritySpring Data JPAJWTMySQLREST API
📦
Catalogue
🗃️
Inventory
🛒
Cart
🛡️
Access Control
E-Commerce Inventory System project details

About me

My background in international project management across 6 countries helps me understand business processes before translating them into software. Today I focus on Java backend development and building systems around clear, practical requirements.

Originally from Poland, living in Scotland since 2014. I moved from international project management into hands-on software development, bringing experience in coordinating complex work and understanding business requirements.

Adaptability: Managed complex projects across 6 countries (Sweden, Norway, Finland, Germany, Slovakia, Poland), coordinating diverse teams and adapting plans when requirements changed.

Self-directed learning: Transitioned from project management into Java and Spring development through structured self-study, with a focus on clean code, SOLID principles and software architecture.

Based in Dundee, Scotland. Eligible to work in the UK and available to start immediately.

Java 17Spring BootSpring Security Hibernate / JPAREST APIsJWT / OAuth2 MariaDBPostgreSQLRedis FlywayDockerPython / Flask Spring CloudMicroservicesGit
🐙 GitHub 💼 LinkedIn Download CV

Get in touch

Open to Java backend developer opportunities in the UK or remote.

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