Simon Leybovich

Backend Software Engineer

Buenos Aires, Argentina · UTC-3

I work on the parts of a system users never see: message-driven services on AWS, transactions that stay consistent across services, and the tracing that tells you why something failed in production.

Resume GitHub LinkedIn Email

Open to new roles

About

I've been writing backend code professionally since 2024, mostly .NET services on AWS, plus TypeScript and Java. What I enjoy most is the less visible work: keeping distributed transactions consistent, making failures show up in dashboards before they show up in support tickets, and writing tests that let the next person change the code safely.

Outside work I build small AI tools for my own problems: an n8n pipeline that filters job posts for me, and CVFit, which tailors a CV to a job description. Next, I want a role where I own a service from design to production.

200×
faster production dashboard (~52 s → ~0.2 s) with MySQL indexing and query tuning
+50%
MongoDB performance from indexing and query tuning
+20%
availability after rolling out OpenTelemetry and Grafana

Experience

Creative Coefficient

Apr 2026 – Present

Software Engineer

  • Cut a production dashboard's load time from ~52 s to ~0.2 s (over 200× faster) by adding a MySQL index and optimizing the queries in the Java code.
  • Built a full-stack credential management module with role-based access control and an audit log of every access.
  • Designed an email reminder pipeline on AWS EventBridge and Resend, from job scheduling to delivery.

.NET · Java · TypeScript · React · MySQL · AWS EventBridge · Resend

Mobile Computing · a Grid Dynamics company

Mar 2024 – Feb 2026

Backend Software Engineer

  • Implemented the SAGA pattern with MassTransit and AWS SQS/SNS to keep distributed transactions consistent.
  • Rolled out observability with OpenTelemetry and Grafana, improving availability by 20% and reducing MTTR.
  • Tuned MongoDB indexes and queries, improving persistence performance by 50%.
  • Built a test suite with NUnit and Moq plus SonarQube quality gates, halving critical post-release bugs.
  • Integrated services with Salesforce Loyalty Management to automate the benefit lifecycle.
  • Improved image generation performance by 30% with headless Playwright rendering and direct uploads to AWS S3.
  • Member of the team awarded Grid Dynamics' Delivery Team of the Year 2025.

.NET · CQRS · SAGA · MassTransit · AWS · MongoDB · OpenTelemetry · Grafana · Salesforce

Projects

n8n Job Search Pipeline

Live

Scrapes LinkedIn job posts, skips the ones already stored in Notion, scores each new post with Gemini and OpenCode, and sends good matches to Telegram. Handles retries and rate limits.

n8n · Gemini · OpenCode · Notion API · Telegram · MCP

GitHub

CVFit

WIP

Takes a CV (PDF or DOCX) and a job description, scores how well they match using OpenCode, and generates a tailored version of the CV. Self-hosted with Docker on Dokploy.

Next.js · OpenCode · Docker · Dokploy

Live
More on GitHub

Stack

Languages & Frameworks
C#, .NET, TypeScript, Java, Node.js, NestJS, Express, SQL
Architecture
Microservices, DDD, Clean Architecture, Hexagonal, CQRS, SAGA, MVC
Data & Cache
SQL Server, MySQL, PostgreSQL, MongoDB, DynamoDB, Redis
Cloud & DevOps
AWS, SQS, SNS, S3, EventBridge, API Gateway, CloudWatch, Docker, Azure DevOps, ArgoCD, SonarQube, Git
Observability
OpenTelemetry, Grafana
AI
Claude Code, Cursor, OpenCode, Claude API, MCP, n8n

Education

  • B.S. in Information Technology

    Universidad de Palermo

    2026 – 2028 (expected)

  • Systems Analyst (associate degree)

    ORT Argentina

    2023 – 2025

Languages: Spanish (native), English (B2, professional working)

Hiring for a backend role?

Email is the fastest way to reach me; I usually reply within a day. I'm looking for backend and applied-AI roles.

simonleybo@gmail.comLinkedIn GitHub