Senior Backend Engineer — Distributed Systems | Golang · Python · Node.js · Web3
12+ years building high-throughput production systems in fintech, trading platforms and crypto infrastructure.
Distributed Systems & Backend
Event-driven microservices, real-time trading infrastructure, resilient payment systems
— Go, Python (FastAPI/asyncio), Kafka, Redis Streams, gRPC, WebSockets, PostgreSQL, Kubernetes, GCP/AWS, OpenTelemetry.
Web3 & Smart Contract Engineering
Deepening expertise in EVM, Solidity, and on-chain infrastructure
— A natural extension of my background in trading systems and financial protocols.
Tools: Foundry, Hardhat, Ethers.js, Slither.
A zero-to-production Solidity/EVM roadmap consolidating fundamentals,
patterns, security analysis, and production-readiness concepts.
Built with a security-first mindset — including attack vectors,
common pitfalls, and curated resources.
👉 github.com/wesleymassine/solidity-reference
Complete smart contract implementation with:
- 47 tests · 100% coverage
- Threat modeling across 10+ attack vectors
- Architecture documentation with design trade-offs
- Production readiness assessment (budget, timeline, operational risks)
👉 github.com/wesleymassine/solidity-projects/tree/main/01-simple-token
- Production-first — reliability, correctness, observability from day one
- Security by design — explicit threat modeling, not afterthought
- End-to-end ownership — architecture through deployment and monitoring
- Clear documentation — design decisions explained, not just implemented
Primary: Go · Python (FastAPI, asyncio) · Node.js / TypeScript
Messaging & Streaming: Kafka · Redis Streams · RabbitMQ · gRPC
Data: PostgreSQL · BigQuery · Elasticsearch · Redis
Cloud & Infra: GCP (GKE, Pub/Sub) · AWS (ECS, SQS/SNS) · Kubernetes · Docker
Observability: OpenTelemetry · Prometheus · Grafana
Web3: Solidity · EVM · Foundry · Ethers.js
LinkedIn: linkedin.com/in/wesleymassine