Immediate Join: Sr .NET Tech Lead

GUILLERMO RIVERA MEDINA

Sr. Software Developer/ Technical Lead

CEL: 554-***-**** MAIL: ******@*****.*** Location: Mexico (Remote) PROFESSIONAL SUMMARY

Senior Software Architect and Technical Lead with over 14 years of professional experience designing, building, and scaling enterprise-grade distributed systems. Expert in the .NET ecosystem (C#), focusing on cloud-native architectures, high-throughput microservices, and robust event-driven systems. Proven track record leading development teams through agile transformations, handling complex legacy migrations, and managing containerized infrastructures using Docker and Kubernetes (AKS/EKS). Strong background in Infrastructure as Code (IaC), CI/CD automation, and modern frontend frameworks

(React/Angular).

TECHNICAL SKILLS

● Languages & Core Tech: C#, Go (Golang), .NET (Core 6/8/9), Framework (4.5 - 4.8), TypeScript, JavaScript (ES6), Java.

● Cloud & DevOps: Azure (AKS, Functions, Queues, Azure SQL), AWS (EC2, S3, RDS, DynamoDB, Lambda), Kubernetes, Docker, Terraform (IaC), CI/CD Pipelines

(GitHub Actions, GitLab CI).

● Architecture & Patterns: Microservices, Event-Driven Architecture, REST APIs, OData, CQRS, Resilience Patterns (Circuit Breaker, Retry, Bulkhead), Semantic Kernel (AI Agents).

● Artificial Intelligence & LLMs: Agentic Workflows, Semantic Kernel, LangChain, LLM Orchestration, RAG (Retrieval-Augmented Generation), Prompt Engineering, Vector Databases.

● AI Models & Frameworks: Claude (Haiku/Sonnet), OpenAI API, Gemini

● Databases: SQL Server (2008 - 2022), Oracle (10g), MongoDB, MySQL.

● Frameworks & UI: React, Angular (12+), AngularJS, MVC 5, Entity Framework.

● Tools & Methodologies: Technical Leadership, Agile/Scrum, Code Reviews, Git, Postman, Pentaho Kettle.

PROFESSIONAL EXPERIENCE

Sr. Software Developer / Tech Lead Global HITSS

August 2024 – July 2026

● Led the backend optimization and feature development for the "Palig" Agent Portal, migrating monolithic components into highly scalable microservices.

● Containerized core batch services using Docker and orchestrated deployments in Kubernetes (AKS), improving system scaling and resource utilization.

● Designed and implemented secure REST/OData APIs using modern .NET architectures, ensuring high availability and system resilience through circuit breaker and retry patterns.

● Enhanced and optimized heavy database objects (stored procedures, indexes, tables) in SQL Server, achieving a significant reduction in execution times for critical insurance policy data.

● Architected and executed an AI-driven Proof of Concept using Claude Haiku to dissect a complex legacy monolith, enabling the automated blueprinting of a modern microservices architecture and accelerating the initial phase of enterprise-wide cloud modernization, using spec drive design.

Sr. Software Architect & Consultant Freelance

April 2023 – August 2024

● Capgemini Project (Coca-Cola Femsa): Optimized the Variable Payment Portal by updating, re-engineering, and creating complex Stored Procedures (SPs) and database objects, significantly accelerating financial data processing speeds. Updated existing AWS Lambda functions used for data calculation and implemented RDS optimization for portal processing.

● KUA Candy Project: Designed and built a custom automated data extraction system from the OData API (Business Central) to SQL Server, ensuring real-time inventory synchronization; subsequently migrated the architecture into Docker containers utilizing the .NET Core Linux runtime for cloud deployment. Using a hands-on, conversational AI workflow to accelerate the software lifecycle. Guided the AI through iterative chat-based sessions to generate production code, validate edge-case test scenarios, and compile step-by-step setup documentation.

● NOVACOMP: Designed and developed an internal automation tool integrated with the OpenAI API (GPT-3) to optimize operational tasks and data analysis workflows.

● Heineken Project: Fixed, stabilized, and enhanced production modules for the Sales and Reporting Portal; conducted the technical ana

Sr. Software Developer VANCO

March 2020 – April 2023

● Handled the technical analysis, architectural design, and development of core fintech payment platforms.

● Designed and deployed serverless architectures using Azure Functions and Azure Queues to process automated financial statement generations asynchronously.

● Wrapped core payment services into Docker containers to standardize development, testing, and production environments.

● Integrated complex third-party payment gateways and high-volume commercial APIs, prioritizing system security, fault tolerance, and low latency. Technical Lead PriceTravel

April 2018 – March 2020

● Led the implementation engineering team on daily tasks, resolving architectural design blockers and aligning deliverables with Scrum/Agile methodologies.

● Managed high-volume platform deployments and implemented live monitoring strategies for cloud-hosted environments.

● Modernized sections of the core B2C/B2B sales platform (.NET MVC 5, C#), transitioning critical paths to modern API standards and optimizing application resilience.

● Provided Tier-3 architectural support to platform owners and high-volume commercial affiliates.

Sr. Software Developer PlanetMedia CRE

October 2017 – April 2018

● Developed, tested, and documented core modules for the SIRETRAC platform.

● Designed and executed data migration services across multiple running database systems.

Technical Lead / Sr. Software Developer Synersis – Nissan Mexico May 2016 – September 2017

● Developed "Factoraje", a highly transactional web platform for billing and payment consolidation.

● Built "Legados Services", a real-time data ingestion system processing and importing high-volume data streams into SAP.

● Supervised provider deliverables for the Nissan Credit Mobile Solution, ensuring software acceptance criteria.

Technical Lead IDS – Banamex

February 2016 – May 2017

● Managed the technical work plan, analysis, design, and development for a strategic financial data extraction and consolidation platform. Reports Developer NA-AT Technologies – Seguros NYL August 2015 – February 2016

● Created business reports based on SAP Crystal Reports and Oracle 10g. Technical Lead / Sr. Software Developer PRODESIS June 2013 – May 2015

● Developed SISGE platform modules and mentored the development team. Built WCF services and managed data integrations (ETL) with Pentaho Kettle. Sr. Software Developer AGO Consultores

June 2012 – June 2013

● Analyzed and developed Floorplans for retail giants like Walmart and Commercial Mexicana.

Software Developer PortoMX – Navistar

January 2012 – June 2012

● Administered SharePoint environments and built internal wiki documentations. Software Developer Manpower – Vision & Holdings

January 2011 – January 2012

● Updated POS systems and built transactional web services for central database syncing.

Software Developer PortoMX – Hoteles City Express / COVIDIEN January 2010 – January 2011

● Migrated legacy "Convenios" modules from VB to ASP.NET. Software Developer Gisnet

January 2008 – January 2010

● Designed requirements for the SIADP platform, including an image indexing and processing tool.

EDUCATION & CERTIFICATIONS

● Education: Degree in Information and Communication Technologies / B.S. in Engineering equivalent.

● Certifications:

Google AI Professional.

Initial Certified IA Development

● Languages: English (Advanced / Professional Working Proficiency) Spanish

(Native).

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