DARIUSZ KOROLCZUK
js, and React applications. I design and ship REST APIs and serverless workloads on AWS, with a focus on migrations, integrations, and CI/CD hardening.
About
Hi, I’m a full‑stack software engineer who specializes in building robust Java/Spring, Node.js, and React applications. I design and ship REST APIs and serverless workloads on AWS, with a focus on migrations, integrations, and CI/CD hardening. I enjoy collaborating with clients to translate requirements into delivered solutions and reliable deployments.
I’ve led migrations and distributed systems work, improved logging and error handling, and developed integration and contract tests. I’m client‑facing and delivery‑oriented, committed to writing maintainable code and delivering value on time.
- 18 years' experience
- Joined December 2025
Skills· 14
Languages
- PolishFluent
- EnglishFluent
Industry experience
- Software & Internet
- Government
- Education
- Professional Services
Work experience· 9 roles
Design and implementation of REST services and event-driven workflows using Java and Node.js. Migrated Spring Boot applications from 2.x to 3.x and Java 8 to 21. Updated AWS SDK from v1 to v2 and Node.js from 16 to 20. Stabilized CI pipelines (CodeBuild and Jenkins). Improved logging and error handling. Worked directly with clients to gather requirements and deliver solutions.
Leads a 10-person team. Plans workload. Resolves software and hardware issues.
Managed a team of 10, planned tasks, and troubleshooted software and hardware issues.
Education
Certifications and awards
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