Serhii

SERHII DONCHENKO
LEAD FULL-STACK ENGINEER | SOLUTION ARCHITECT | AI-ENABLED SOFTWARE DEVELOPMENT
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PROFESSIONAL SUMMARY

Lead Full-Stack Software Engineer and Solution Architect with 20+ years of experience designing, modernizing, and
delivering scalable web platforms, cloud-native services, data-intensive systems, and engineering practices across product
and enterprise environments. Strong hands-on expertise in Node.js, TypeScript, NestJS, React, PostgreSQL, MongoDB, AWS,
GCP, Docker, Kubernetes, CI/CD, distributed systems, and secure API design. Experienced in technical leadership,
architecture governance, mentoring, production troubleshooting, and translating business requirements into maintainable
solutions. Actively applies AI coding agents, prompt and context engineering, MCP-based tooling, and human-in-the-loop
review to accelerate analysis, implementation, testing, documentation, and code review without compromising software
quality.

CORE EXPERTISE

Architecture: DDD, Clean Architecture, Microservices, Cloud & Platform: GCP, AWS, Docker, Kubernetes,
Modular Monoliths, Event-Driven Architecture, REST, Cloud Run/EC2, CI/CD, Jenkins, GitLab CI
GraphQL
Backend: Node.js, TypeScript, NestJS, JavaScript, PHP, Integration: RabbitMQ, queues, caching, third-party
Go, WebSockets APIs, payment and logistics integrations
Frontend: React, Next.js, React Native, Angular, Vue.js, Quality & Security: Unit, integration and E2E testing,
HTML, CSS code review, SAST/DAST, observability, secure SDLC
Data: PostgreSQL, MySQL, MongoDB, Redis, data Leadership: Solution design, technical strategy,
modelling, query optimisation mentoring, delivery planning, stakeholder collaboration

AI & MODERN ENGINEERING SKILLS

AI coding agents (OpenAI Codex, GitHub Copilot and comparable tools) | Agentic software development workflows |
Prompt engineering | Context engineering | MCP (Model Context Protocol) | LLM API integration | RAG concepts |
Tool/function calling | Agent orchestration concepts | AI-assisted refactoring, testing and code review | LLM output
evaluation, guardrails and human validation | Technical documentation automation | Observability and security for AI-
enabled workflows

PROFESSIONAL EXPERIENCE

Full-Stack Developer | Commercegate
Remote | May 2023 - Present
• Develop and maintain full-stack product functionality using Node.js, TypeScript, modern web frameworks, relational and
document databases.
• Design and evolve APIs, integrations, asynchronous processing, data models, and production-ready backend workflows.
• Build and improve frontend functionality with React-based technologies, focusing on maintainability, usability, and reliable API
integration.
• Investigate production incidents, analyse logs and metrics, identify root causes, and implement regression-safe fixes.
• Contribute to CI/CD, containerised delivery, cloud deployments, application monitoring, and engineering quality controls.
• Support secure software delivery through code review, automated testing, dependency management, and SAST/DAST-oriented
practices.
• Use AI coding agents for repository analysis, implementation planning, refactoring, test generation, documentation, and review
while retaining human ownership of architecture and final validation.
Founder / Lead Software Engineer / Solution Architect | ServicitY
Kyiv / Remote | May 2023 - Present
• Designed and built the architecture of a multi-tenant CRM/ERP SaaS platform from the ground up, covering customers, orders,
projects, warehouse accounting, billing, subscriptions, employee access, and logistics integrations.

Serhii Donchenko | Lead Full-Stack Engineer / Solution Architect
• Applied Domain-Driven Design and Clean Architecture principles with aggregates, repositories, Unit of Work, domain events,
explicit transaction boundaries, and UUID-based public API contracts.
• Built backend services with NestJS, TypeScript, PostgreSQL, MongoDB, Redis, RabbitMQ, automated tests, and CI/CD pipelines.
• Delivered web and mobile interfaces using React and React Native and established consistent UX patterns across operational
modules.
• Designed cloud deployment and infrastructure evolution across AWS and GCP, including containerisation, secret management,
monitoring, and release safety.
• Defined engineering standards for code review, testing, security, migration safety, observability, and production support.
• Integrated AI-assisted engineering workflows for architecture analysis, implementation prompts, code review, documentation, UI
ideation, and controlled agent-based development.
Lead Software Engineer / Solution Architect | EPAM Systems
Kyiv / Remote | Nov 2020 - May 2023
• Designed, modified, and implemented cloud-based solutions aligned with client requirements and enterprise architecture
principles.
• Delivered backend systems and integrations using Node.js and TypeScript, from discovery and solution design through
implementation and production support.
• Created and maintained requirements, architecture, design, and operational documentation.
• Handled complex data modelling, performance analysis, scalability concerns, and reliability improvements.
• Collaborated with software, infrastructure, security, and hardware teams to improve customer experience and data protection.
• Mentored engineers on client processes, architecture, delivery practices, and technology stacks.
• Defined system scope and technical objectives through research, stakeholder communication, and analysis of complex
information systems.
Senior / Lead Software Engineer | Severalnines AB
Kalmar / Remote | Oct 2014 - Nov 2020
• Led a team of five senior engineers delivering new capabilities for database automation and management products.
• Designed and implemented real-time processing functionality using PHP, Node.js, Go, and WebSockets.
• Modernised the frontend from ExtJS to Angular and contributed to Vue.js-based Backup Ninja products.
• Migrated backend components from CakePHP to Node.js and later Go while preserving product continuity.
• Developed a framework for integrations with compute, storage, and network platforms.
• Improved engineering quality through automated testing, documentation, continuous integration, and development best
practices.
• Collaborated with cross-functional teams to meet technical, security, regulatory, and product requirements.
Senior Software Engineer | Ciklum
Kyiv | May 2013 - Oct 2014
• Implemented and maintained modules for a client platform based on PHPFox.
• Developed profile functionality and access controls for sensitive user and organisational data.
• Investigated production issues and supported engineering and customer-service teams with timely resolutions.
• Worked in an Agile cross-functional environment and mentored junior developers on delivery practices and code quality.

EARLIER EXPERIENCE

Senior Software Engineer | Mementia | Kyiv | Jun 2012 - May 2013
Senior Software Engineer | Postindustria | Kherson | May 2011 - Jun 2012
Software Engineer | Vsesvit ISP | Mykolaiv | Sep 2004 - May 2011

EDUCATION

Master's Degree in Applied Mathematics | Odesa I. I. Mechnikov National University | 2000 - 2005

PROFESSIONAL DEVELOPMENT

Software Architecture: Domain-Driven Design | Cloud-Native Twelve-Factor Applications | Serverless Architecture | AWS
Essential Training for Developers | Developing Team Members | High-Performance Engineering Practices | Continuous
learning in AI-assisted software engineering, LLM integration, agentic workflows, cloud architecture, and application
security

Serhii Donchenko | Lead Full-Stack Engineer / Solution Architect