Senior Blockchain Engineer – Backend Scalability Overhaul

Harbor Softworks

Contract · Remote · Flexible hours

About the role

Harbor Softworks is modernizing its blockchain layer to boost performance and reliability for its flagship customer‑facing services. As a Blockchain Engineer you will lead the redesign of the core smart‑contract suite, ensuring low latency and high throughput under peak loads. This short‑term engagement focuses on delivering a resilient, production‑ready solution for the upcoming release cycle.

Key responsibilities

• Audit and refactor the existing "PulseChain" smart‑contract module to reduce gas consumption by at least 30%.
• Implement off‑chain caching strategies using Redis and Layer‑2 rollups to improve transaction finality.
• Set up automated performance testing pipelines with Hardhat, Ganache, and Locust.
• Collaborate with the DevOps team to integrate contract deployment into CI/CD using GitHub Actions and Terraform.
• Document contract interfaces and versioning strategy in OpenAPI‑compatible format.
• Deliver a post‑deployment monitoring dashboard in Grafana for real‑time health metrics.

Must-have skills

• Deep expertise in Solidity and smart‑contract architecture.
• Proficiency with JavaScript/TypeScript tooling (Hardhat, Truffle, ethers.js).
• Experience optimizing gas usage and implementing Layer‑2 solutions.
• Strong understanding of blockchain security best practices and audit processes.
• Familiarity with CI/CD pipelines and infrastructure as code.

Nice to have

• Background in Rust‑based smart contracts (e.g., Solana, NEAR).
• Experience with formal verification tools such as Certora or MythX.