CV - Diego Reyes

Kopius, United States — Senior System Engineer (Remote)

Aug 2025 – Current

Developed Backend services with Nodejs - NestJS for Loan management platform.
Designed and implemented scalable APIs and lending-related business logic.
Contributed to Integrated Azure Cosmos DB (MongoDB) for data persistance and configuration management.

Inmatics, Argentina — Sr. Fullstack Developer

Jan 2023 – Current

Built a web application platform for real-time satellite tracking and proactive vehicle maintenance management, designed to improve operational visibility.
Enabled fleet operators, logistics companies, and vehicle owners to monitor assets, analyze usage patterns, and receive automated maintenance alerts.
Designed and deployed the backend in Golang (REST API with chi, MySQL via GORM), running on AWS EC2 for scalability and high availability.
Developed the frontend with React.js and Ant Design, delivering a modern, intuitive, and fully responsive user interface for desktop and mobile.

Security Scorecard, New York — Senior System Engineer (Remote)

Sep 2021 - July 2025

Authored and led adoption of internal API development guidelines to align engineering practices, improving code maintainability and onboarding speed across multiple teams.
Specialized in database performance and query quality.
Conduct code reviews with SonarQube and CodeRabbit to ensure high coding standards.
Contributed to the MongoDB-to-PostgreSQL migration initiative.
Developed a Golang service to continuously monitor PostgreSQL replica streams by parsing the Write-Ahead Log (WAL), detecting data changes in near real-time, and proactively managing Redis cache key invalidations to ensure consistency between the database and distributed cache layer.

Making Sense, Argentina — Sr. Fullstack Developer (remote)

Jun 2020 – Sep 2021

Developed scalable APIs with Node.js/TypeScript using Koa, GraphQL, and MongoDB, while integrating with multiple third-party services such as Airship, Salesforce, Mailgun, and Fahm to support complex business workflows.
Built and maintained frontend applications in Angular 9 for Barnes & Noble College clients, delivering a modern, reliable, and responsive user experience for a large academic user base.
Sustained ~90% automated test coverage across backend and frontend codebases, and implemented comprehensive end-to-end test suites with Protractor, ensuring product stability and reducing regression issues.

Nybble Group, Argentina — Sr. Backend Developer (remote)

Dec 2019 – Mar 2021

Discovery Education project: Extracted and transformed enterprise data from Tagetik and ADP systems to generate automated reporting solutions, improving data accuracy and accessibility for stakeholders.
Designed and deployed serverless APIs with Azure Functions to integrate and synchronize Azure client account data, enabling secure and efficient cloud-based workflows.
Pet insurance project: Built and maintained robust APIs using TypeScript, TypeORM (MySQL), and GraphQL Apollo, delivering reliable policy management and enhancing application scalability.

Playtika, Israel — Senior Backend Developer (remote)

Jul 2019 – Dec 2019

Led a technical feasibility study to design an automatic code migrator from C# to TypeScript, evaluating alternatives to Bridge.NET and assessing long-term maintainability.
Implemented a comprehensive suite of unit tests in TypeScript and JavaScript to validate language syntax coverage and ensure functional equivalence across migrated codebases.
Successfully delivered a fully working proof of concept within a 6-month contract, providing actionable insights for future large-scale game migration initiatives.

Aracar Group, Argentina — Sr. Fullstack Developer / Team Leader

Mar 2018 – Jul 2019

Led backend development of loan origination, approval, and disbursement systems, ensuring secure workflows and regulatory compliance.
Delivered customer and dealer web portals integrated with credit bureau APIs, enabling automated credit decisions and streamlined loan processing.
Designed and deployed RESTful microservices in Node.js leveraging AWS, RabbitMQ, Docker, ES6, and async/await for scalable, event-driven architectures.
Managed persistence with MongoDB Atlas, implementing optimized schemas and queries to handle financial transaction data efficiently.
Built modern frontends with React.js, Redux, and Ant Design, delivering intuitive user experiences for both internal teams and external clients.
Championed code reviews, performance optimization, and best practices, improving code quality and reducing production incidents.

Port of Buenos Aires Administration — Technical Lead

Dec 2013 – Mar 2018

Coordinated the development of RESTful services and back-office applications to securely integrate operational data with multiple port terminals.
Designed and maintained backend services with Node.js (0.12 → 8.0), MongoDB 3.6, and Oracle 11.2, improving reliability and data consistency across systems.
Adopted a microservices architecture to replace legacy manual processes (email/FTP), significantly reducing errors and accelerating data exchange.
Led a frontend team using AngularJS, driving the project from inception and delivering a modern, maintainable user interface for port operations.

FansWorldTV, Capital Federal, Argentina

Jun 2013 – Dec 2013

Built and optimized Smart TV streaming applications for an on-demand video platform, enhancing media delivery performance and user experience.
Contributed to a back-office migration from PHP to C# / SQL Server, implementing modern HTML5/CSS3/jQuery features to improve maintainability and scalability.

GLOBANT, Capital Federal, Argentina

Apr 2012 – May 2013

Worked on-site at The Coca-Cola Company, collaborating with cross-functional teams on enterprise-scale digital solutions.
Developed backend services using C# and SQL Server 2012, delivering secure and reliable data management for sales operations.
Built mobile applications with Sencha Touch (JavaScript framework) to support field sales order management, streamlining processes for on-the-ground sales representatives.

INFOTECH CARIBBEAN, Port of Spain, Trinidad & Tobago

Feb 2011 – Feb 2012

Led the development of a national Health Application for the Ministry of Health, integrating electronic medical records across multiple hospitals and improving interoperability.
Designed and implemented the backend using .NET C# WCF Services with SQL Server 2008 R2, paired with a Silverlight frontend to deliver secure and responsive healthcare workflows.
Built a robust API Validator to ensure consistency and integrity of patient records, medical practices, and contractual data across the healthcare system.

SAETECH SA, San Isidro, Argentina

Jan 2006 – Jan 2011

Built and maintained a vehicle satellite tracking system handling ~5,000 trips per month, providing real-time visibility and operational insights for clients.
Developed back-office applications with C# and SQL Server 2005/2008, streamlining client, route, and trip management workflows.
Implemented real-time tracking with Google Maps integration, improving accuracy and usability for monitoring vehicle locations.
Created a comprehensive healthcare management platform supporting patient contracts, professional scheduling, and medical history, enhancing efficiency for healthcare providers.

SMATA, Capital Federal, Argentina

Apr 1998 – Dec 2005

Developed intranet healthcare apps using VB6, ASP, and HTML/JavaScript.
Administered SQL Server 6.0 → 2000 databases.
Delivered solutions for patient records, contracts, and operational workflows.

DIEGO REYES

Senior Software Engineer

Personal summary

Skills

Professional experience