Blockchain Developer

SOLANA BLOCKCHAIN ENGINEER (RUST) (Paid)

Role Overview

Job Title: Solana Blockchain Engineer - Smart Contracts & Settlement Infrastructure

Company: GoQuant Technologies Inc.

Location: Remote

Employment Type: Full-time

Start Date: Immediate

Primary Responsibilities

Smart Contract Development (60%)

- Design and implement Solana programs using Rust and Anchor framework

- Build perpetual futures contracts with dynamic funding rates (1-second calculation, hourly payment)

- Develop position management system supporting up to 1000x leverage with robust liquidation mechanics

- Implement collateral vaults, margin calculations, and PnL tracking

- Create ephemeral wallet authority system with on-chain permission management

- Build settlement batching mechanisms for high-throughput trade execution

Settlement Infrastructure (30%)

- Develop transaction batching and relayer services for efficient on-chain settlement

- Implement Merkle tree verification for trade batch integrity

- Build wallet transaction signing infrastructure for automated settlement

- Create monitoring systems for failed settlements and automatic retry logic

- Design and implement program-controlled vaults with secure custody patterns

Integration & Testing (10%)

- Integrate with Pyth/Switchboard price oracles for mark price and funding rates

- Build comprehensive test suites (unit, integration, and on-chain testing)

- Deploy and maintain programs on Solana devnet/testnet/mainnet

- Performance optimization for high-frequency trading scenarios

- Documentation of smart contract architecture and settlement flows

Key Technical Challenges

- Performance: Handle 100+ trades/second with sub-second settlement latency

- Security: Manage user funds non-custodially with multiple safety mechanisms

- Scalability: Batch thousands of trades efficiently to minimize transaction costs

- Risk Management: Build real-time liquidation systems that protect protocol solvency

- UX: Enable fast trading via ephemeral wallets while maintaining security

Required Qualifications

Technical Skills:

- 3+ years of professional Rust development experience

- 1+ years building on Solana (programs deployed to mainnet preferred)

- Strong understanding of Solana's programming model (accounts, PDAs, CPIs, rent)

- Experience with Anchor framework for Solana program development

- Proficiency with cryptographic signatures and wallet transaction signing

- Deep knowledge of blockchain fundamentals (consensus, finality, state management)

DeFi Experience:

- Understanding of perpetual futures mechanics (funding rates, leverage, liquidations)

- Experience with DeFi protocols (DEXs, lending, derivatives)

- Knowledge of oracle integration patterns

- Familiarity with common DeFi security patterns and vulnerabilities

Software Engineering:

- Strong systems programming background

- Experience with concurrent/parallel programming

- Ability to write clean, well-tested, production-quality code

- Comfortable working in fast-paced startup environment

- Self-directed with strong problem-solving skills

Preferred Qualifications

- Experience building settlement/relayer infrastructure for DEXs

- Knowledge of dark pool or institutional trading mechanics

- Contributions to open-source Solana projects

- Experience with Solana web3.js, anchor-ts, or similar SDKs

- Background in smart contract security auditing

- Familiarity with TypeScript/Node.js for off-chain components

- Understanding of market maker systems and order book mechanics

- Previous work on high-leverage or derivatives protocols

- Experience with program upgrades and migration strategies