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Ignacio Nizetich

@ignacionizetich

Message

I build secure, high-throughput backend and payment systems with Go, Java, and Spring Boot.

Argentina

Message

What I'm looking for

I'm looking to build secure, high-throughput backend and payment systems, owning services from architecture through production with strong testing, security, and delivery practices.

I've built Felwinter, a P2P marketplace and escrow platform, including a high-performance Go microservice for real-time WebSocket traffic, API Gateway routing, and Redis caching.

I designed its Java 21 and Spring Boot 3 financial backend around Stripe and Mercado Pago integrations, split payments, event-driven processing with Apache Kafka, ACID transactions, ledger auditing, and encrypted evidence storage on Cloudflare R2. I also applied Resilience4j circuit breakers, exponential backoff, and rate limiting to protect payment endpoints under load.

Across bids412 and ArCash, I've led backend and DevOps work for real-time auctions and virtual-wallet services, handling concurrency, secure transfers, RBAC, JWT refresh-token rotation, automated testing, and GitLab CI/CD pipelines.

I've also developed cloud-native NestJS and TypeScript APIs for Tembiapo. I own services from design through production and use AI tooling such as Claude Code to accelerate delivery while keeping security, testing, and code quality central.

Experience

Work history, roles, and key accomplishments

Current

Software Architect & Lead Backend Developer

Current

Felwinter

Jan 2023 - Present (3 years 7 months)

Built a distributed Go microservice for real-time WebSocket traffic and API Gateway routing, and designed a Java/Spring Boot escrow platform integrating Stripe and Mercado Pago with split payments.

Go Java Spring Boot WebSockets API Gateway Redis Stripe Mercado Pago PostgreSQL Cloudflare R2 React Claude Code

Current

Backend Lead & DevOps Engineer

Current

bids412

Jan 2023 - Present (3 years 7 months)

Designed a high-concurrency bidding platform in Spring Boot 3/Java 21, managing race conditions and real-time state synchronization, with automated testing and CI/CD pipelines.

Java Spring Boot Mockito JaCoCo CI CD JWT OWASP

Current

Lead Backend Developer

Current

ArCash

Jan 2023 - Present (3 years 7 months)

Engineered a virtual wallet backend focused on ACID transactional integrity, account ledgers, and secure fund transfers, with Spring Security and RBAC.

Java Spring Boot Spring Security ACID REST APIs OpenAPI Swagger

Current

Backend Developer

Current

Tembiapo

Jan 2023 - Present (3 years 7 months)

Developed cloud-native RESTful APIs using NestJS, TypeScript, and PostgreSQL within an agile Scrum workflow, optimizing queries and deploying with Docker.

NestJS TypeScript PostgreSQL Prisma Docker Scrum

Education

Degrees, certifications, and relevant coursework

Universidad Tecnológica Nacional (UTN)

Tecnicatura Universitaria en Programación, Programming

2023 -

Pursuing a Technical Degree in Programming, with coursework in data structures, algorithms, database design, and systems architecture. Expected graduation in 2026.