Full Stack Engineer

Flint Labs is building a high-performance on-chain DEX on Solana. Recently, we shipped our first product: a plug-and-quote path into Solana's order flow, the highest-volume, most active in DeFi. Makers bring their pricing and risk logic; Flint handles the rest. The production MVPs for spot, borrow/lend and perps are underway, and early team members will define core architecture and protocol design. The company is fully backed by Ergonia, a crypto-native market-making firm with deep experience trading and building on Solana. We are starting from a deliberately minimal core and iterating rapidly toward a full-featured mainnet exchange. This is a high-ownership role building production systems under aggressive timelines. About the role

• You will design and build across Flint's full stack, from on-chain and backend systems to the frontend trading interface.

Responsibilities

• Build core exchange logic: markets, users, collateral, fees, and order routing.

• Build the trading interface: order entry, positions, balances, charts, and real-time market data.

• Implement on-chain matching, margining, liquidation, and risk enforcement.

• Integrate Solana wallet flows and backend services into real-time UI systems.

• Help design the end-to-end architecture of the exchange, from smart contracts to the frontend.

• Implement low-latency data streaming and state management across the stack.

• Improve developer tooling and onboarding experience.

• Optimize systems for latency, throughput, and compute efficiency.

• Write thorough tests and maintain clear, living documentation.

• Own features end to end, from design to production.

Requirements

• 3+ years of professional software development experience.

• Comfortable working across the stack: Rust for backend and on-chain systems, React and TypeScript for frontend.

• Experience building complex, data-intensive web applications.

• Strong backend fundamentals including APIs, distributed systems, and async systems.

• Experience with low-latency or performance-sensitive systems.

• Familiarity with DeFi, trading, or financial applications.

• Ownership mindset and comfort in an early-stage environment.

• Strong English communication skills.

Bonus points

• Experience building trading interfaces or orderbook-style UIs.

• Experience integrating Solana wallets and transaction flows in web apps.

• Solana runtime optimizations and CU profiling.

• Previous experience with matching engines, order books, prop AMMs, or execution systems.

• Familiarity with perpetuals, margin trading, funding mechanics, or ADL.

• Market-making or trading infrastructure experience.

What we offer

• No bureaucracy, just fast shipping and real impact.

• High ownership and real impact from day one.

• Competitive base plus meaningful token/equity upside aligned with long-term protocol success.

• Fully remote.

• IRL meetups and company offsites.