DeFi Software Engineer

DeFi Developer — High-Performance Crypto Trading Systems

Responsibilities:

Selini Capital is seeking a sharp, ambitious developer to join our DeFi trading team. In this role, you'll help build and scale high-performance systems that operate directly on decentralized markets. You'll be working hands-on across our entire trading stack — from blockchain integration and trading logic to infrastructure and observability.

You'll be expected to:

• Contribute production-grade code in Rust, Python, and related technologies

• Build systems that interact with on-chain protocols (e.g., Solidity, JSON-RPC, Solana, MEV workflows)

• Develop and refine real-time monitoring, strategy tools, and execution pipelines

• Debug and optimize across the performance spectrum: latency, reliability, throughput

• Interface with protocol teams and external projects to support new market opportunities

• Grow into end-to-end ownership across DeFi integrations and trading infrastructure

Why This Role Is Unique

• Full Systems Exposure: You'll gain hands-on experience across the full trading system — infrastructure, strategy logic, execution, and on-chain interaction — giving you rare visibility into how modern algorithmic trading systems work.

• DeFi at the Core: DeFi is one of the most intellectually rich intersections of software and finance. You'll learn how protocols work under the hood, and how on-chain dynamics create real trading edge.

• Elite Teammates: You'll be joining a small, world-class team of engineers, quants, and traders with backgrounds in top-tier firms, academic institutions, and olympiad-level programming competitions.

• Startup Velocity: We move fast, deploy frequently, and make decisions quickly. Your work will ship to production fast and have immediate real-world impact.

This is an ideal role for someone who sees themselves as a top technologist and is ready to apply that talent to one of the most cutting-edge environments in finance and crypto.

Qualifications
We're looking for driven developers who want to grow rapidly by working on hard, meaningful problems.

You should have:

• 3–7 years of professional software development experience

• Strong programming skills and the ability to write clean, testable, and efficient code

• A solid grasp of core computer science principles: algorithms, data structures, concurrency, networking, etc.

• Demonstrated technical excellence, such as:

  • Top academic performance in CS, math, physics, or engineering

  • Competitive programming or olympiad success (e.g., ICPC, IMO, IPhO, IOI)

  • Internship or full-time experience at a highly selective tech company or fund

• Ability to pick up new concepts quickly, take ownership, and communicate clearly

Language Experience
Rust is preferred, but you should have experience in at least one systems or statically typed language such as C++, Java, Go, C#, Kotlin, or similar.

Preferred Skills

Strong Preference

• Understanding of trading systems, market structure, or strategy implementation

Light Preferences

• Familiarity with DeFi: working with smart contracts, blockchain APIs, MEV, or Solana
• Experience in Rust
• Comfort with AWS, Grafana, or other infrastructure/observability tools
• Strong math or statistics foundation, especially around modeling or simulation

Company Culture & Team Fit
We're a close-knit team that values:

• High ownership and initiative

• Curiosity, intellectual honesty, and rapid learning

• Clear, direct communication

• Working together toward shared goals — no ego, no politics

We hire people who love building, solving, and improving — and who want to learn from and contribute to a team of exceptional peers.

Location & Compensation

• In-office only — based in New York City and London

• Very competitive compensation, with strong upside based on contribution and performance