Foto de Sergio Parissi Reyes
Sergio Parissi Reyes
Senior .NET Developer · Sitecore Specialist · Cloud & Azure
⚡ .NET Core⚡ C#Sitecore · 7+ yrsAzure10+ yrs experience
10+
Years .NET
7+
Sitecore Core
12
Certifications
3
Enterprise Clients

.NET developer at heart. With 10+ years of experience in C#, ASP.NET MVC, and .NET Core, I architect and deliver robust, scalable enterprise applications — from clean API design and data layers to cloud infrastructure on Azure. My foundation is deep backend engineering: performant, maintainable, production-grade code.

Over the past 7+ years, I have built a strong specialization on top of that .NET core: the Sitecore ecosystem — Helix/Habitat architecture, SXA, JSS (Headless CMS), Sitecore Commerce, and Personalization — delivering CMS solutions for global enterprise clients. Sitecore runs on .NET, and understanding the platform at its deepest level is what sets me apart.

Currently at EPAM Systems, I serve as the primary technical point of contact for enterprise clients — leading architectural decisions, Azure cloud deployments, and root-cause analysis on critical systems. I also build PowerShell automation for Sitecore operations — log analysis, layout management, and environment maintenance — reducing manual overhead and keeping environments healthy. Beyond code, I act as a trusted technical advisor and actively mentor developers: conducting code reviews, guiding onboarding, and promoting a culture of continuous learning across the team. Over the past year I have integrated AI-assisted development (Claude / Claude Code) into my daily workflow — accelerating code generation, refactoring, and documentation while personally reviewing and validating every change before it lands in production.

Senior .NET Developer
EPAM Systems
May 2022 – Present
Cancún, Mexico (Remote)
  • Primary technical point of contact for multiple enterprise clients, leading root-cause analysis, technical roadmap discussions, and feature design for mission-critical Sitecore applications.
  • Architected and developed custom Sitecore solutions using Helix, SXA, JSS, and Sitecore Personalization, ensuring performance, scalability, and long-term maintainability.
  • Proactively proposed and evaluated multiple technical solutions per client request, clearly outlining trade-offs, risks, and implementation strategies — accelerating decision-making cycles.
  • Deployed, configured, and managed Azure resources (App Services, Azure Functions, Storage, SQL), maintaining high availability and security across all environments.
  • Monitored application health, validated infrastructure stability, and coordinated rapid incident response — reducing client-reported downtime.
  • Produced comprehensive technical documentation for knowledge transfer, onboarding, and client audits.
  • Built and maintained PowerShell automation scripts for Sitecore environments — automating log analysis, layout management, reference cleanup, and IP-range configurations — significantly reducing manual operational overhead.
  • Mentored engineers across the team: conducted code reviews, facilitated knowledge-sharing sessions, and actively supported onboarding of new developers — fostering a culture of continuous learning and technical growth.
  • Used Azure Application Insights and the Sitecore Pipeline Profiler to diagnose performance bottlenecks, monitor application health in real time, and drive targeted optimizations across Sitecore environments.
  • Adopted AI-assisted development (Claude / Claude Code) over the past year to accelerate engineering workflows — code generation, refactoring, documentation, and analysis — maintaining full review and validation of every change before integration.
Senior Sitecore Developer (Independent)
Freelance / Contract Projects
Apr 2020 – Apr 2022
Remote · Part-time / Parallel to Vanco role
  • Designed and delivered end-to-end Sitecore CMS solutions for clients across multiple industries, following Helix architecture and Sitecore best practices.
  • Built and integrated headless CMS components via custom REST APIs and the Sitecore JSS framework, enabling decoupled front-end architectures.
  • Provided strategic technical consulting for Sitecore upgrades, SXA implementations, and personalization initiatives.
  • Managed full project lifecycle independently: requirements, scoping, development, QA, delivery, and documentation.
Senior Software Development Engineer
Vanco Payments · SmartCare (Business Unit)
Apr 2020 – May 2022
Cancún, Mexico
  • Built and maintained enterprise web apps using C#, ASP.NET MVC, .NET Core, Web API, Angular, and React.
  • Integrated Azure Functions and event-driven cloud services to support scalable, asynchronous workflows in a multi-tenant architecture.
  • Authored and maintained NUnit unit and integration tests, raising code quality and reducing regression risk.
  • Defined and rolled out a Git branching strategy adopted company-wide, improving collaboration and release velocity.
  • Contributed actively to Azure DevOps CI/CD pipelines, enabling automated builds, tests, and deployments.
Software Development Engineer in Test (SDET)
Vanco Payments – ASAP
Apr 2018 – Apr 2020
Cancún, Mexico
  • Designed and implemented a centralized automated testing framework used across multiple products, standardizing regression coverage company-wide.
  • Implemented application monitoring and observability using ELK Stack and MongoDB, enabling proactive production issue detection.
  • Defined, documented, and rolled out a new QA process improving consistency and software quality across teams.
  • Developed and maintained Azure DevOps CI/CD pipelines for automated test execution and deployment workflows.
QA Automation Engineer / Senior QA
BestDay.com
Jun 2015 – Apr 2018
Cancún, Mexico
  • Planned, designed, and executed test strategies for web and mobile applications (iOS), driving early adoption of mobile automation.
  • Developed automated test scripts with Selenium, expanding regression coverage and reducing manual testing effort.
  • Defined QA policies, testing standards, and technical procedures to ensure data integrity and system reliability.
Junior Software Developer (PHP)
MayanAccess
Aug 2016 – Sep 2017
Cancún, Mexico
  • Developed data management web applications using PHP and SQL Server, supporting internal business processes.
  • Designed and executed SQL scripts to process and manipulate large data volumes efficiently.
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