Сергій

Serhii Zdorenko
Software Engineer
[відкрити контакти](див. вище в блоці «контактна інформація») [відкрити контакти](див. вище в блоці «контактна інформація») Dnipro, Ukraine

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PROFILE
FinTech-focused Software Engineer with 4.5+ years of experience stabilizing and modernizing mission-
critical legacy platforms across Java/Scala and Python. Proven at diagnosing deep architectural defects and
optimizing performance in high-load systems; designed and deployed an AWS ElastiCache (Redis) layer
handling 50M+ keys and ~20GB, eliminating resource exhaustion and enabling scalability without a major
rewrite. Operates autonomously end to end—architecture, implementation, and production support—
bridging legacy codebases with modern cloud services. Tech-agnostic problem solver who rapidly masters
new stacks to deliver reliable, measurable business outcomes.

EMPLOYMENT HISTORY
08/2021 – Present EPAM Systems
Software Engineer
Key Responsibilities & Achievements:
Infrastructure Modernization & Scalability: Independently designed and
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implemented a large-scale caching layer using AWS ElastiCache (Redis) to
optimize a high-load legacy application. Architected the cluster configuration to
manage 50M+ keys and 20GB of data, successfully extending the application’s
lifecycle and preventing resource depletion without requiring a full system
rewrite.
Complex Troubleshooting & System Stability: Acted as the primary point of
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contact for identifying and resolving deep-seated, “hard-to-diagnose” bugs and
performance bottlenecks in integration with financial systems. Managed regular
system updates and performance tuning, ensuring high availability and reliability
for core financial services.
Autonomous Technical Leadership: Operated as a fully self-sufficient engineer
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without senior mentorship, taking full ownership of architectural decisions and
the end-to-end development lifecycle for critical tasks. Consistently delivered
solutions for high-complexity requirements, regardless of the technology stack or
existing documentation gaps.
Polyglot Development & Integration: Maintained and improved a diverse
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codebase involving Java, Scala, Python, and Groovy, ensuring seamless
interoperability between legacy modules and modern components. Contributed
to frontend stability by troubleshooting and updating Angular components when
required, demonstrating flexibility across the full technology stack.
Performance Optimization: Analyzed and refactored legacy code to improve
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execution speed and resource efficiency, enabling the platform to handle
increasing data volumes in a FinTech environment.

11/2013 – 08/2021 Allo, Dnipro
Analyst
Reports for department heads and top managers of the company.
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Analysis and forecasting of sales.
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Preparation of technical assignment for improvements in ERP and BI, control of
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implementation.
Supporting the budgeting process.
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 EDUCATION
01/2001 – 01/2006 Bachelor’s degree in Mechanical Engineering
Ukrainian State Chemical Technology University, Dnipropetrovsk

SKILLS
Java (Core) Scala Python
AWS Kubernetes Docker
Git Maven Akka
Play Framework Jenkins GitLab CI
Angular

LANGUAGES
English
B2