Antonio Vargas
Maracaibo, Venezuela
Antonio Vargas
Senior Backend Engineer — Node.js, TypeScript, AWS
Category : Web development
Senior Backend Engineer with 8+ years of hands-on experience building production-grade REST APIs and microservices for US enterprise clients (eBay, Cefaly, Sunrun). Specialized in Node.js, TypeScript, and NestJS, with deep expertise in AWS serverless architecture (Lambda, API Gateway, DynamoDB, SQS, EventBridge, S3, CloudFormation).
Core strengths include multi-tenant backend design with PostgreSQL row-level security, third-party API integrations (OAuth 2.0/JWT, webhooks, idempotency, reconciliation), event-driven architecture, and CI/CD pipeline implementation. Comfortable owning features end-to-end in small, autonomous teams, with production testing standards (Jest, TDD, >80% coverage).
Additional experience with MongoDB, SQL Server, and .NET/C# from earlier enterprise projects. Fluent in English (C1), with 5+ years collaborating daily with US-based teams in fully remote settings.
Available for freelance/contract engagements, remote, full-time or part-time.
Core strengths include multi-tenant backend design with PostgreSQL row-level security, third-party API integrations (OAuth 2.0/JWT, webhooks, idempotency, reconciliation), event-driven architecture, and CI/CD pipeline implementation. Comfortable owning features end-to-end in small, autonomous teams, with production testing standards (Jest, TDD, >80% coverage).
Additional experience with MongoDB, SQL Server, and .NET/C# from earlier enterprise projects. Fluent in English (C1), with 5+ years collaborating daily with US-based teams in fully remote settings.
Available for freelance/contract engagements, remote, full-time or part-time.
Working hours
- Monday:08h00 To 18h00
- Tuesday:08h00 To 18h00
- Wednesday:08h00 To 18h00
- Thursday:08h00 To 18h00
- Friday:08h00 To 18h00
- Saturday:Not available
- Sunday:Not available
![I will integrate third-party APIs and webhooks into your system]()
I will integrate third-party APIs and webhooks into your system25 $ - Per hourI handle end-to-end third-party API integrations: OAuth 2.0 authentication flows, webhook ingestion, idempotency handling, and data reconciliation. Experience integrating multi-vendor systems in ...![I will architect your serverless backend on AWS]()
I design and deploy serverless architectures using AWS Lambda, API Gateway, DynamoDB, SQS, and EventBridge, with Infrastructure as Code (CloudFormation/CDK). 5+ years of hands-on AWS experience ...![Service: I will build your REST API in Node.js and TypeScript]()
I design and build production-ready REST APIs using Node.js, TypeScript, and Express/NestJS, with PostgreSQL or MongoDB as the data layer. 8+ years building backend systems for US enterprise clients ...
Node.js/TypeScript backend and serverless AWS solutions delivered across multiple US enterprise engagements (Cefaly, Sunrun, eBay, Bounteous).
Designed and owned multi-tenant REST API layers applying DDD and clean/hexagonal architecture, including PostgreSQL row-level security for strict per-client data isolation.
Led end-to-end third-party integrations — OAuth 2.0/JWT authentication, webhook ingestion, idempotency handling, and reconciliation logic — collaborating directly with external vendors.
Architected serverless backends on AWS Lambda, API Gateway, and DynamoDB, with event-driven pipelines using SQS and EventBridge for background job processing and automated workflows.
Implemented Infrastructure as Code with CloudFormation for reproducible environment provisioning, and led zero-downtime infrastructure migrations to modern providers.
Improved CI/CD pipelines across environments, strengthening release readiness, rollback strategies, and monitoring/alerting practices.
Designed and owned multi-tenant REST API layers applying DDD and clean/hexagonal architecture, including PostgreSQL row-level security for strict per-client data isolation.
Led end-to-end third-party integrations — OAuth 2.0/JWT authentication, webhook ingestion, idempotency handling, and reconciliation logic — collaborating directly with external vendors.
Architected serverless backends on AWS Lambda, API Gateway, and DynamoDB, with event-driven pipelines using SQS and EventBridge for background job processing and automated workflows.
Implemented Infrastructure as Code with CloudFormation for reproducible environment provisioning, and led zero-downtime infrastructure migrations to modern providers.
Improved CI/CD pipelines across environments, strengthening release readiness, rollback strategies, and monitoring/alerting practices.
Node.js / Express / MongoDB REST API development.
• Designed and implemented REST APIs from scratch in Node.js, Express, and MongoDB — full ownership from schema design to
production deployment.
• Applied MongoDB schema design patterns (embedding vs. referencing) and middleware optimization for efficient data access at scale.
• Designed and implemented REST APIs from scratch in Node.js, Express, and MongoDB — full ownership from schema design to
production deployment.
• Applied MongoDB schema design patterns (embedding vs. referencing) and middleware optimization for efficient data access at scale.
Enterprise application development — .NET/C# environment.
• Developed enterprise-level applications using C# and ASP.NET MVC, delivering scalable business-logic layers for high-transaction
environments.
• Managed and optimized MSSQL Server databases: schema design, indexing strategies, and stored procedures for transactional
workloads.
• Developed enterprise-level applications using C# and ASP.NET MVC, delivering scalable business-logic layers for high-transaction
environments.
• Managed and optimized MSSQL Server databases: schema design, indexing strategies, and stored procedures for transactional
workloads.
• Instructed advanced courses in Algorithms, Data Structures, Artificial Intelligence, and Programming Logic.
• Mentored future engineers, fostering deep understanding of software foundations underpinning modern backend development.
• Mentored future engineers, fostering deep understanding of software foundations underpinning modern backend development.
Doctoral research focused on strategic decision-making and organizational development within technology-driven environments. The program combined advanced research methodology with applied management theory, culminating in a dissertation examining how strategic thinking drives organizational performance — later published in the Innovation and Management Journal (2012).
Graduate program centered on the integration of telecommunications and computer science, covering network architecture, distributed systems, and data communication protocols. Provided the technical foundation for building scalable, distributed software systems later applied throughout my backend engineering career.
Undergraduate degree covering core computer science fundamentals: algorithms, data structures, software engineering principles, and programming logic. Built the technical base that later supported both my professional software development career and my role teaching these subjects as a university professor.
- 🇬🇧 English
- 🇪🇸 Spanish
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