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Backend Engineer · Distributed Systems .

I'm Gonzalo. I build APIs, microservices, and cloud infrastructure that scales. I work with .NET, Go, and AWS. From Argentina.

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About

I build systems that scale, don't break, and are easy to maintain.

Full Stack Developer with a strong Back-End focus, specialized in .NET and building APIs and scalable systems. I work with React to create modern and functional interfaces, and I have experience deploying and managing applications on AWS. I enjoy designing clean architectures and efficient solutions, without losing sight of the front-end experience. I'm also an amateur triathlete, and I bring that same discipline and consistency to both sports and technology.

Stack
  • .NET
  • C#
  • Go
  • React
  • Next.js
  • TypeScript
  • PostgreSQL
  • SQL Server
  • MySQL
  • Docker
  • RabbitMQ
  • Kafka
  • AWS
  • Microservices
  • GraphQL
  • Keycloak
  • Prometheus
  • Grafana
  • Loki
  • MinIO
  • GitHub Actions
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Projects

Things I'm building

Featured · In progress 2025 →

Ayron

Training management platform for athletes and coaches.

Independent project. Inspired by my experience as a triathlete and my interest in designing flexible systems for sports planning. I'm designing and operating it end-to-end.

  • Designed and built the system architecture end-to-end; backend in C# using Minimal APIs with a high-cohesion, handler-per-endpoint pattern (MediatR-inspired).
  • Migrated the front-end from Next.js to TanStack after determining SSR wasn't adding real value, since the entire app sits behind a login.
  • Migrated authentication from a self-hosted Keycloak to Cognito.
  • Chose to host everything on a VPS instead of AWS to keep costs low pre-launch, with a planned move to AWS once the app starts onboarding clients.
  • Observability with Prometheus, Grafana, and Loki.
.NET C# TanStack React PostgreSQL Docker Compose Cognito Prometheus Grafana Loki MinIO GitHub Actions AWS SES
View project
Ayron
2025 →

More on github.com/gperelstein

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Experience

Where I've been

Making Sense
Full Stack Developer · Back-End Focus
Sep 2020 →

Software consulting company where I worked on multiple projects for international clients, contributing to the design, development, and evolution of production systems.

  1. Valley Agricultural Software

    Jun 2023 →

    Management system for dairy farms.

    • Contributed to the migration from monolith to microservices, improving scalability and maintainability.
    • Migrated services from .NET Core 3.1 to .NET 6.
    • Designed and implemented an ingredient inventory tracking system for feed management.
    • Implemented async communication between services using AWS SQS and SNS.
    • Optimized a critical offline sync endpoint: ~15 min → ~2 min (~87% faster).
    • Identified and fixed a concurrency-related data duplication issue in production.
    • Built new features and resolved critical production incidents.

  2. CCI · Brokerage Platform

    Feb 2023 — Jun 2023

    Investment visualization platform for a brokerage's clients.

    • Built a serverless backend on AWS Lambda.
    • Developed GraphQL APIs to expose financial data.
    • Integrated internal client systems to centralize investment data.
    • Ran performance tests with JMeter to validate scalability.

  3. ALFI

    Apr 2022 — Jan 2023

    Targeted advertising platform on tablets installed in vehicles.

    • Contributed to migrating the backend from Go to .NET 6.
    • Participated in requirements analysis and system design.
    • Worked on data processing for targeted advertising.
    • Convinced the client to drop Akka.NET for the new system by presenting the technical trade-offs, moving forward with a simpler, more maintainable conventional .NET API instead.

  4. Academic Health Plans

    Sep 2021 — Apr 2022

    Health insurance management platform for students in the US.

    • Designed an automated state transition system for waiver validation, replacing manual processes.
    • Integrated external validation services.
    • Implemented async communication with RabbitMQ.
    • Resolved critical production issues.

  5. Field Control Analytics

    Sep 2020 — Sep 2021

    Management system for large-scale construction sites.

    • Built an integration enabling construction companies to sync their site data with Procore, a widely used construction management platform.
    • Developed a worker access-card generation system integrated with Field Control's physical turnstile hardware for on-site access control.
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Contact

Say something. I reply to everything.

Send me a message. I reply to everything. If it's work, even better.

Or direct:
gmperelstein@gmail.com
GitHub
@gperelstein
LinkedIn
Gonzalo Perelstein