Сергій

Serhii Denysenko
[.NET Software Engineer | Azure | Sitecore | Enterprise Applications]

Phone: [відкрити контакти](див. вище в блоці «контактна інформація») | Telegram: @W_SDenysenko | Email: [відкрити контакти](див. вище в блоці «контактна інформація»)
LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація»)

PROFILE
.NET Software Engineer with nearly 5 years of commercial experience designing,
developing, maintaining, and optimizing enterprise-scale web and cloud applications within
the Travel & Hospitality domain. Strong backend expertise in C#, .NET Framework 4.8,
.NET Core, ASP.NET Core, Sitecore CMS, Microsoft Azure, performance optimization,
production support, and cloud-native solutions. Experienced in designing Azure Function-
based services, API integrations, service contracts, observability solutions, CI/CD pipelines,
and technical decision-making. Proven ability to identify root causes of complex issues,
improve system reliability, and deliver business-critical solutions.

CORE COMPETENCIES
C# • .NET Framework 4.8 • .NET Core • ASP.NET Core • ASP.NET MVC • Azure Functions •
Sitecore • REST APIs • Performance Optimization • Redis • Solr • Production Support •
CI/CD • Observability • Docker • Cloud Solutions

EXPERIENCE
EPAM Systems, Ukraine | Senior .NET Software Engineer | February 2022 – May 2026

Project Domain: Travel & Hospitality (MSC Cruises B2C Platform)

• Designed and implemented Azure Function-based backend services, participating in
solution design, API definition, service contracts, and technical decision-making.
• Developed cloud-native solutions using Azure Functions, Azure Active Directory, Azure
API Management, Azure Key Vault, Azure Storage, ASP.NET Core, and Sitecore.
• Participated in architecture discussions and feature design across a large enterprise
platform developed by multiple Agile teams (20–30 engineers).
• Built and maintained integrations using Redis, Azure services, Sitecore, Microsoft SQL
Server, and MongoDB.
• Improved observability through Dynatrace, OpenTelemetry, Splunk, ELK, and Sitecore
monitoring tools.
• Conducted code reviews and promoted engineering best practices to improve
maintainability and reliability.
• Developed deployment automation and operational tooling using PowerShell, Docker,
Jenkins, and GitLab CI/CD.
• Participated in on-call rotations, production incident investigation, root cause analysis,
and delivery of urgent fixes for business-critical issues.
• Collaborated closely with architects, QA engineers, DevOps specialists, and business
stakeholders throughout the software development lifecycle.
• Led implementation of complex features and provided technical guidance during
feature delivery.

Key Achievements

• Reduced search execution time from approximately 50 seconds to 10–20 seconds by
optimizing search GraphQL logic, indexing strategies, and caching mechanisms.
• Identified and resolved a Sitecore configuration issue that triggered unnecessary full
Solr index rebuilds that brake big part of content search, eliminating recovery
operations that previously required 2–3 hours and preventing platform-wide
degradation.
• Designed and implemented a secure cross-domain session data exchange mechanism
between the primary website and Azure-hosted services using Azure Blob Storage and
session identifiers.
• Resolved complex language-resolution issues affecting POST requests by analyzing
Sitecore configuration behavior and implementing a long-term solution adopted by the
project.
• Designed and implemented 5+ Azure Functions–based solutions supporting
integrations, business workflows, and cloud-native processing scenarios.
• enhanced authentication and authorization solutions based on JWT, OAuth 2.0, OpenID
Connect, and Azure Active Directory.
• Improved Redis-based caching and session storage implementations to increase
performance, scalability, and system reliability.
• Built internal Sitecore CMS tooling and a C# bulk-update script for all consent-related
form changes and support during release, improving productivity for content authors.
• Installed and validated Sitecore cumulative updates, coordinated technical
communication with Sitecore support, and documented web check-in backend
knowledge for Solution Architects.

TECHNICAL SKILLS
• Backend Development: C#, .NET Framework 4.8, .NET Core, ASP.NET Core, ASP.NET
MVC, Entity Framework Core, REST APIs, Unit Testing, Code Reviews
• Cloud & Azure: Azure Functions, Azure Storage, Azure Blob Storage, Azure Key Vault,
Azure Active Directory (AAD), Azure API Management, Azure Logic Apps, Azure Data
Factory, Azure Monitor, Azure Service Bus.
• Architecture & Integration: Service-Oriented Architecture (SOA), Microservices,
Service Contracts, API Design, System Integration, RabbitMQ (Basic Experience)
• Databases, Caching & Search: Microsoft SQL Server, MongoDB, Redis, Solr, GraphQL,
Rest, Elastic Search, PostgreSQL (Basic Experience)
 • Sitecore Ecosystem: Sitecore XP, Sitecore Content Hub, Unicorn, Sitecore PowerShell
Extensions (SPE), Content Management (CM), Content Delivery (CD)
• DevOps & Observability: Docker, Docker Compose, Jenkins, GitLab CI/CD, GitHub,
SonarQube, Dynatrace, Octopus, OpenTelemetry, ELK Stack, Splunk
• Security: JWT, OAuth 2.0, OpenID Connect, Authentication & Authorization, XSS/CSRF
Mitigation
• Frontend & Scripting: JavaScript, TypeScript, Vue.js, PowerShell

CERTIFICATIONS
Sitecore Content Hub Developer
Sitecore 10 .NET Developer
Deep Learning using TensorFlow
Deep Learning Fundamentals

EDUCATION
Zaporizhzhia Polytechnic National University
• MASTER OF INFORMATION SYSTEMS AND TECHNOLOGIES (2022–2025)
• BACHELOR OF SOFTWARE ENGINEERING (2018–2022)

LANGUAGES
Ukrainian (Native)
English (B2)