Senior Rust Backend Engineer at Startale Labs answer
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Job Description
<h2>About Us</h2>
<p>In partnership with one of the largest financial conglomerates, we aim to bring the majority of Japanese equities on-chain, creating a secure, transparent, and high-performance trading infrastructure that can support institutional volumes while remaining accessible to retail participants. We are building a next-generation decentralized exchange with a fully on-chain order book. Our system is built with a custom state transition function and consensus layer, purpose-designed for high-performance, low-latency trading. The goal is to deliver a trustless platform that matches the speed and efficiency of traditional trading engines while providing full transparency by running execution as close as possible to the blockchain itself.</p>
<h2>Position Overview</h2>
<p>We are seeking a&nbsp;<strong>Senior Rust Backend Engineer</strong>&nbsp;experienced in building&nbsp;<strong>high-performance, reliable trading APIs (HTTP &amp; WebSocket)</strong>. You will be responsible for designing, implementing, and optimizing the backend services that power our exchange interfaces - ensuring low latency, resilience, and correctness under load.</p>
<p>You’ll work on high-throughput, real-time systems that handle order and trade data ingestion, manage live WebSocket feeds, and maintain internal state consistency from streaming market events. The ideal candidate is both a strong Rust engineer and a system thinker, capable of reasoning about concurrency, data flow, and observability in production environments.</p>
<p>This role offers an opportunity to shape the architecture of our trading backend at an early stage, working alongside a distributed team of seasoned engineers building next-generation financial infrastructure.</p>
<h2>Key Responsibilities</h2>
<ul>
<li class="p1"><strong>Own the architecture and technical direction</strong> of high-performance trading APIs (HTTP &amp; WebSocket) supporting low-latency order entry, market data distribution, and account state updates.</li>
<li class="p1"><strong>Lead the design and implementation of structured concurrency</strong> using the Tokio runtime, defining best practices for task lifecycle management, cancellation semantics, backpressure, and graceful degradation under load.</li>
<li><strong>Develop and maintain real-time state ingestion pipelines</strong>:
<ul>
<li>Process append-only logs (e.g., trades, order updates, book diffs).</li>
<li>Rebuild local states efficiently using snapshot + diff application.</li>
</ul>
</li>
<li><strong>Model trading-related data structures</strong>, including orders, fills, trades, positions, funding, and liquidation logic.</li>
<li><strong>Implement WebSocket connection