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Sergii Didenko

@sergiididenko

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Senior Software Engineer with 10+ years of experience building backend, cloud and enterprise systems.

Romania

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What I'm looking for

I'm open to remote B2B contracts in the EU, building production AI and agentic workflows alongside cloud-native Java, Spring, and AWS systems.

At Signant Health, I build a production Python AI automation platform that turns source documents into XML questionnaires and forms using specialized agents for document understanding, generation, localization, and validation.

I combine LLM and agent workflows with deterministic business rules and retrieval-assisted generation, deploying on AWS with Bedrock AgentCore, Strands SDK, S3, Lambda, AWS SAM, Docker, and React.

Previously at EPAM Systems, I reverse-engineered Canadian Tire's 6-million-LOC legacy RPG retail system, built ETL migration mechanisms and REST APIs for its Java replatform, and led work across four development streams.

I've also delivered secure Spring Boot B2B systems, mobile and web platforms, and open-source AI/ML work, including 16 published Hugging Face models.

Experience

Work history, roles, and key accomplishments

Current

Key Software Engineer, Technology R&D

Current

Signant Health

Jun 2023 - Present (3 years 3 months)

Build a production AI automation platform in Python that generates XML questionnaires/forms from source documents using specialized agents. Develop and deploy the platform on AWS using Bedrock AgentCore, Strands SDK, S3, Lambda, AWS SAM, and Docker, with React for the web UI.

Python AI Agents LLM Integrations AgentCore AWS Strands SDK RAG Prompt Engineering AWS S3 Lambda AWS SAM Docker React Terraform Helm ArgoCD Jenkins Amazon EKS Okta ExoStar Copilot Cursor Claude Code

Java Software Engineer, Tech Lead

EPAM Systems

Apr 2019 - Apr 2023 (4 years)

Reverse-engineered a 6-million-LOC legacy RPG in-store retail system for Canadian Tire, producing a documented system model that guided the replatform to Java. Designed and implemented an ETL migration mechanism and built a RESTful web-service layer on top of the new Java platform.

Java Spring Boot REST APIs ETL Reverse Engineering JProfiler Microservices Code Review Solution Design

Java Developer, Full Stack Developer

ReignCode SRL

Jun 2015 - Feb 2019 (3 years 8 months)

Built and maintained web and mobile platforms across education, e-commerce, and GPS/Android domains for small teams. Designed and launched B2B systems with secure Spring Boot backends and integrations with government APIs, payment, identity, and geolocation services.