Software Engineer - 2027 Interns

Ellipsis Labs; New York (NY); On-site; USD 80,000 - 120,000; Full time

Job summary

A venture-backed startup is seeking a developer to build sustainable DeFi protocols. The ideal candidate will have hands-on experience in programming languages like TypeScript and Python, solid CS fundamentals, and a curiosity about the DeFi and crypto space. You will be responsible for building product features, owning projects from start to finish, and collaborating with design and engineering teams to create reliable user experiences. All positions are located in New York City.

Qualifications

• Hands-on experience building software through courses, personal projects, or internships.
• Strong understanding of data structures, algorithms, and systems thinking.
• Curiosity about DeFi/crypto is appreciated.

Responsibilities

• Build product features across the stack based on skills and interests.
• Own projects from problem definition to monitoring.
• Collaborate with design and engineering teams to improve user experiences.

Skills

TypeScript/JavaScript

Python

Rust

Java

C/C++

Git

CI/CD

Docker

Job description

Overview

Ellipsis Labs is a profitable, venture-backed New York-based startup building sustainable and efficient DeFi protocols on high-throughput decentralized infrastructure. Our long-term goal is to build a better financial system. Our flagship product, Phoenix Perpetuals, brings professional-grade perpetual futures to Solana. Building on our experience developing efficient markets, Ellipsis Labs also operates SolFi, a proprietary automated market maker that provides efficient liquidity for key trading pairs. Our foundational product, Phoenix Legacy, is a limit order book on the Solana blockchain that established our expertise in operating high-performance markets. Combined, these products have facilitated over $285B in trading volume across Solana markets. All roles are in the Ellipsis Labs office in New York City.

Responsibilities

• 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