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Salary
$86k – $194k per year (Estimated)
Location
Remote (United Kingdom)
Seniority
Middle · 3+ years exp
Employment
Full-Time
Overview
Company
Impact
Profile match
You own quality and test automation at Cashen. You will build the QA infrastructure from the ground up - automated test suites, CI integration, regression coverage, and release validation - for a platform where bugs have financial consequences. A missed edge case in a deal state transition or an interest accrual rounding error doesn't just degrade UX - it moves money incorrectly between institutional counterparties.

Superis Labs is building a high-performance perpetual futures DEX on Solana. The first production MVP is 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 and venture builder 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.

What You’ll Work On

You will design and build the core on-chain and backend systems that power a perpetual exchange, with a focus on correctness, performance, and simplicity.

Responsibilities

  • Build core exchange logic: markets, users, collateral, fees, order routing
  • Implement professional liquidity sources, on-chain matching, margining, liquidation, and risk enforcement
  • Help design the end-to-end architecture of a perpetuals exchange
  • Ensure on-chain and off-chain systems operate as a cohesive, low-latency stack
  • Optimize systems for latency, throughput, and compute efficiency
  • Write thorough tests and maintain clear, living documentation
  • Improve developer tooling and onboarding experience
  • Design, implement, and deploy production-grade Solana smart contracts in Rust

Requirements

  • 3+ years of professional software development experience
  • Strong Rust proficiency (production experience preferred) or willingness to learn
  • Strong backend fundamentals (APIs, distributed systems, async systems)
  • Experience with low-latency or performance-sensitive systems
  • Familiarity with DeFi, trading systems, or derivatives
  • Ownership mindset and comfort working in an early-stage environment
  • Strong English communication skills

Bonus Points

  • Solana runtime optimizations and CU profiling
  • Previous work experience with matching engines, order books, or execution systems
  • Perpetuals, margin trading, funding rates, or ADL
  • Market-making or trading infrastructure experience

Benefits

  • No bureaucracy - just fast shipping and real impact
  • High ownership and real impact from day one
  • Competitive base + meaningful token/equity upside
  • Early team members receive ownership aligned with long-term protocol success
  • Fully remote
  • IRL meetups and company offsites
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