Open to opportunities

Jaroslaw Groscyk

@jaroslawgroscyk

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Senior software engineer and architect building cloud-native Java platforms with AI capabilities.

Germany

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What I'm looking for

I’m looking for a role where I can lead software architecture and modernization in cloud-native Java systems, while integrating AI-native features (RAG, agentic workflows, MCP). I want to work with teams that value hands-on engineering and practical leadership.

I’m a Senior Software Engineer and Architect with 8+ years of experience building modern, cloud-native Java/Spring Boot applications. I lead cross-functional teams through technical architecture grounded in Domain Driven Design, and I bring AI-native capabilities into SaaS systems—especially RAG pipelines, Agentic Workflows, MCP, and Claude Code.

In my current role, I provide technical consulting and hands-on development for the modernization of an enterprise AWS energy management platform. I support a migration from monolith to hexagonal microservice architecture, implement backend features (Java/Spring Boot), and introduce AI-assisted development practices like GitHub Copilot and Agentic Workflows to the team.

Previously, I owned and led end-to-end development of an Online Shopping product, guiding up to 12 cross-functional engineers while shaping software architecture, technical roadmap, and cloud migration. I also architected and delivered an AI/ML-driven credit contract generation system using Spring AI, integrating LLMs with RAG/Qdrant and agentic workflows.

Across healthcare and e-commerce projects, I’ve built and modernized systems with a strong focus on integration, security, and maintainable architecture—working with AWS/GCP, event-streaming infrastructures, and patterns like CQRS and hexagonal architecture. My professional ethos is practical engineering with strategic architectural thinking that helps teams ship reliable systems faster.

Experience

Work history, roles, and key accomplishments

Current

Technical Consultant

Current

FourEnergy GmbH

Apr 2024 - Present (2 years 3 months)

Provided technical consulting and hands-on development for modernization of an enterprise AWS energy management platform, including migration from a monolith to a hexagonal microservice architecture.

Technical Consulting Modernization AWS Microservices Hexagonal Architecture Java Spring Boot

Technical Owner & Lead Developer

Payback GmbH

Oct 2023 - Mar 2024 (5 months)

Provided end-to-end technical ownership of the Online Shopping product within the Payback loyalty platform. Led technical direction for up to 12 cross-functional engineers and supported software architecture, roadmapping, and cloud migration of legacy systems.

Java Spring Boot Kotlin Angular Vue.Js GraphQL Apache Kafka Mentoring Technical Leadership Software Architecture Roadmapping Cloud Migration Product Roadmap QA

Senior Software Engineer

DKB AG

Feb 2022 - Sep 2023 (1 year 7 months)

Owned end-to-end backend and frontend development for a credit contract generation system, serving as application owner and architect for the K4.0 SCS contract system. Integrated LLM/RAG and event-streaming infrastructure while contributing agentic workflows and MCP-based capabilities.

Java Spring Boot Vue.Js Kafka PostgreSQL CQRS Docker RAG Qdrant MCP (Model Context Protocol)Context Engineering Anthropic SDK

Lead Developer and Software Architect

adesso SE

Jan 2020 - Jan 2022 (2 years)

Led developer and architecture work across multiple healthcare projects, including building a scalable billing platform and implementing cryptographic core components for qualified electronic signatures.

Java Spring Boot Angular Vert.X Python AWS EC2 ECS Lambda SQS Bouncy Castle FHIR OpenID Docker Kubernetes Jenkins Keycloak

Senior Software Engineer

Adesso SE

Jan 2020 - Jan 2022 (2 years)

Served as Lead Developer and Software Architect across multiple healthcare projects. Delivered a scalable billing platform and implemented cryptographic core components, qualified electronic signatures, and trusted execution environment capabilities, alongside security extensions for sensitive medical data.

Java Spring Boot Angular Vert.X Python AWS EC2 ECS Lambda SQS Docker Kubernetes Jenkins Bouncy Castle FHIR OpenID Keycloak Qualified Electronic Signatures OWASP Security Frameworks

Software Engineer

Adesso SE

Jun 2019 - Dec 2019 (6 months)

Developed control software for the Lab-on-a-Chip device DxU at Bosch Healthcare. Worked on Java-based backend components and web application features using the listed technologies.

Java OSGi Angular Maven PostgreSQL MongoDB MySQL OAuth 2.0 Oracle PL SQL DxU

Java Developer

Adviqo AG

Jan 2017 - May 2019 (2 years 4 months)

Maintained and further developed an e-commerce platform and migrated a monolithic system toward a microservice architecture. Applied Domain Driven Design and hexagonal architecture while implementing backend and security-related features.