Ellipsis Labs is a profitable, venture-backed New York startup building performant DeFi protocols on high-throughput decentralized infrastructure. Our long-term mission is to build a more efficient, transparent, and fair financial system.

Our flagship product, Phoenix Perpetuals, brings professional-grade perpetual futures to Solana. Phoenix has processed over $4 billion in trading volume and is growing 20% month over month, adding to the more than $300 billion our products have facilitated to date. Behind Phoenix is a lean, high-caliber team with experience at top trading firms, blockchain companies, and tech companies.

Ellipsis Labs is seeking software engineering summer interns to join our team in 2027. As an early-stage startup, we appreciate bright generalists who can iterate and ship quickly. In this role, you will:

Build real product features and/or platform components across the stack, front end, back end, infra, or on-chain, based on your skills and interest

Own scoped projects end-to-end: problem definition → design → implementation → testing → deployment → monitoring

Collaborate with design and engineering to deliver fast, reliable, and secure experiences

Instrument and improve performance, reliability, and observability; write clear tests and documentation

Qualifications

Required

Hands-on experience building software (courses, personal projects, research, or internships) in one or more languages such as TypeScript/JavaScript, Python, Rust, Java, C/C++; you write clear, tested code

Solid CS fundamentals (data structures, algorithms, systems thinking) and familiarity with Git and basic debugging

Ability to make informed trade-offs with business context; high agency and a team-first mindset

Curiosity about DeFi/crypto (prior domain experience not required)

Preferred

Experience in one or more areas: full-stack web (React/Javascript), backend APIs/services, infrastructure/DevOps (Docker, CI/CD, cloud), or on-chain/low-level systems

Familiarity with blockchain technology (Solana a plus)

Interest or experience in fintech/trading

Rust or TypeScript proficiency