Need senior Full stack developer for DEX platform update -2

Job ID: 39777424

Budget: $1,500 – $3,000 USD

Hello
I am preparing the next release of our decentralized exchange and need a senior full-stack engineer to steer a comprehensive upgrade across three areas:

1. User Interface
The entire front end has to be redesigned, not just reskinned. I want a cleaner aesthetic, smoother user flows, and several new screens/features rolled in at the same time. Every change must feel intuitive to both desktop and mobile traders.

2. Smart-Contract Integration
Our Solidity contracts need a security hardening pass, gas-cost optimization, and the addition of new functions that support the features introduced on the UI. All updated contracts must be fully tested, audited, and verified on-chain before we move them to production.

3. Backend Infrastructure
The current backend must be refactored so throughput, latency, and fault tolerance meet the demands of higher trading volume. Expect to review architecture, update APIs, and put automated CI/CD in place.

Deliverables and acceptance criteria
• Revamped, responsive UI pushed to staging and production with Lighthouse score ≥ 90
• Hardened, optimized smart contracts deployed and verified, with unit/integration tests ≥ 95 % coverage
• Backend refactor live with zero-downtime migration, passing load tests at 2× current peak traffic
• Clean hand-over packet: code, documentation, deployment scripts, and rollback plan

If you have a proven record delivering end-to-end upgrades on DEX or DeFi systems, outline a brief plan and timeline for each phase when you submit your proposal.

Thank you