gmkrieger

Blockchain Engineer

Blockchain engineer with 4+ years in Web3 infrastructure. Based in Rio de Janeiro, Brazil.

Senior experience in backend development, familiar with AWS structure and productions level output and maintenance. Most recently at Moonsong Labs, I co-developed SNOS (Starknet Operating System) – achieved 40% performance improvement in block execution. Previously at Cartesi, built a resilient node, with blockchain indexing handling 10,000+ transactions/hour and reduced indexing failures by 85% during chain reorgs.

Core expertise: Rust, Go, Python | ZK rollups, optimistic rollups, consensus algorithms | Ethereum, Starknet, Substrate

Seeking: Senior blockchain engineering roles at protocols and infrastructure companies. Remote-first, open to full-time or long-term contracts. Ready to contribute to L1/L2 scaling, ZK systems, or cross-chain infrastructure.

Master's in Computer Science (PUC-Rio) focused on neural network optimization and techniques.

GitHub: github.com/GMKrieger | LinkedIn: linkedin.com/in/gustavo-krieger-a13621102

Experience: 4 years

Yearly salary: $110,000

Hourly rate: $0

Nationality: 🇧🇷 Brazil

Residency: 🇧🇷 Brazil

Experience

Blockchain Engineer

Moonsong Labs

2024 - 2025

Co-developed SNOS (Starknet Operating System), orchestrating CairoVM for block execution and STARK proof generation, achieving 40% performance improvement over baseline implementation in Python. Engineered high-performance Rust components for Starknet tooling integration, eliminating re-execution edge-cases through optimized hint integration and RPC coordination. Built modular components for Madara, enabling 3x faster JSON-RPC support across deployment stack. Implemented custom feeder-gateway systems balancing cryptographic correctness with node operability requirements. Collaborated with Pathfinder team to enhance debugging visibility and reduce system downtime by 25%. Led the development of the Substrate MCP server, a service to improve AI agents’ interactions with Substrate-based chains.

Software & Blockchain Engineer

Cartesi

2022 - 2024

Architected near-chain infrastructure for Cartesi Node, implementing blockchain indexing algorithms handling 10,000+ transactions per hour. Developed resilient checkpointing system with persistent storage, increasing indexing reliability by 85% during frequent chain reorganizations. Designed Merkle tree computation algorithms and EVM interaction protocols for fraud-proof verification systems. Optimized consensus-level mechanisms reducing user transaction costs by 30% while maintaining security guarantees. Enhanced developer tooling and ergonomics, decreasing onboarding time for new developers by 50%.

Senior Data Engineer

Gazeus Games

2021 - 2022

Built ETL pipelines processing 5TB+ daily mobile telemetry data using PySpark and Airflow on AWS infrastructure. Designed validation layers and automated reconciliation jobs achieving 99.9% data accuracy for business intelligence products. Reduced data ingestion latency by 60% through optimized S3 partitioning strategies and ECR container deployment. Partnered with product teams to convert analytics into actionable monetization strategies.

Software Engineer

Jobzi

2019 - 2021

Led backend development for microservices architecture serving 100,000+ daily active users with 99.95% uptime. Established CI/CD pipelines and database migration strategies reducing deployment failures by 70%. Architected data lake infrastructure on AWS (S3, Athena) accelerating analytics team cycle-times by 3x. Owned complete delivery lifecycle including technology selection, database design, and production deployment.

Data Scientist

THINC.

2018 - 2019

Developed predictive models for 17,000+ vehicle fleet optimization achieving 25% improvement in fuel consumption predictions. Applied CNNs, SVMs, and Holt-Winters time-series analysis for route efficiency optimization saving $2M annually. Engineered robust features from heterogeneous telematics data improving fraud detection accuracy by 40%. Deployed production models directly impacting operational planning for Brazil’s biggest vehicle fleet, Serede, serving one of Brazil’s biggest Telecommunications company, Oi.

Software Engineer

BTG Pactual

2017 - 2018

Developed AI-powered risk-scoring system automating 60% of anti-money laundering case triage. Implemented decision-tree ensembles and ordinal perceptron models with MySQL and Neo4J integration. Prioritized model auditing for regulatory compliance while maintaining 92% predictive accuracy. Accelerated downstream analysis team efficiency by 45% through automated preliminary investigations.

Volunteer Coordinator

Rio 2016 Olympic Committee

2016 - 2016

Managed access control and volunteer operations for 10,000+ athletes and staff at Olympic Village. Served as primary francophone liaison for international committees from 20+ French-speaking countries. Coordinated high-pressure operations ensuring zero security incidents during 16-day event.

Skills

aws

backend

ci-cd

data-science

evm

full-stack

java

python

rust

solidity

zk-evm

english

french

portuguese

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