Backend DeFi Developer

Fasanara; City Of London; On-site; GBP 70,000 - 100,000; Full time

Job summary

A crypto investment firm in London is seeking a DeFi Developer to enhance its DeFi infrastructure. Responsibilities include developing systems for monitoring DeFi protocols, automating risk management, and mentoring team members. The ideal candidate has 5+ years in backend engineering with experience in deploying smart contracts and working with DeFi protocols. Attractive benefits include a competitive bonus scheme, health and dental coverage, and generous annual leave.

Benefits

Competitive bonus scheme

Bupa health & dental

Cycle to Work scheme

Enhanced pension

Generous annual leave

Enhanced parental leave

Regular team events

Team sport activities

Qualifications

• Proven experience deploying production smart contracts on EVM or Solana.
• Minimum 5 years of backend engineering experience with strongly typed server-side languages.
• Hands-on DeFi protocol experience, including deploying LP positions on AMMs.

Responsibilities

• Design and build systems for on-chain monitoring across multiple DeFi protocols.
• Develop automated risk management tools including real-time alerting.
• Integrate and automate interactions with DeFi protocols using robust transaction management.

Skills

EVM or Solana deployment

Backend engineering (Java, C++, Go, Rust, TypeScript, Kotlin, Python 3)

DeFi protocol experience (Uniswap, Curve, Balancer)

Web3 libraries knowledge (web3.js, ethers.js)

Docker and/or Kubernetes

Building and maintaining DeFi integrations

EVM internals understanding

Multi-chain environments experience

Financial systems familiarity

Real-time alerting systems knowledge

Job description

Fasanara Digital was established 7 years ago and is the crypto arm of Fasanara Capital, a 14year-old boutique alternative asset manager. We are a Quantitative Investment fund applying a scientific approach to investing in crypto assets. Our goal is to achieve exceptional risk-adjusted returns. We pursue a range of diversified and highly sophisticated investment strategies that seek to profit from inefficiencies in the market structure and range from market making to cross-exchanges arbitrage.

Our Culture

We are strong believers in meritocracy, and we reward people based on impact and excellence. There is no bureaucracy of large organisations, the environment is collaborative, entrepreneurial, and is based on trust. We set ambitious goals, work hard, stress teamwork, and adhere to the highest level of excellence in everything we do. We are only as good as our team. Thus, we are building the firm around exceptional talent.

Position Overview

Fasanara Digital is seeking a DeFi Developer to join our Middle Office Technology team in London. This is a unique opportunity to bridge traditional financial systems with blockchain technology and shape the firm’s DeFi infrastructure from the ground up. You’ll build critical backend systems that monitor on‑chain positions, automate protocol interactions, and implement real‑time risk management. Beyond engineering, you’ll help upskill the broader team in DeFi development, sharing your expertise to ensure the team collectively owns and supports on‑chain code.

Responsibilities

• Design and build systems for on‑chain monitoring across multiple DeFi protocols and blockchains.
• Develop automated risk management tools, including real‑time alerting and automated response mechanisms.
• Integrate and automate interactions with DeFi protocols using robust transaction management.
• Connect blockchain infrastructure to existing accounting and risk management systems.
• Contribute to architecture decisions and greenfield DeFi infrastructure projects.
• Mentor and train team members in DeFi and blockchain development practices.
• Collaborate across teams to bridge traditional finance and DeFi systems, ensuring security and reliability.

Qualifications

• Proven experience deploying production smart contracts on EVM or Solana
• Minimum 5 years of backend engineering experience with strongly typed server‑side languages (e.g., Java, C++, Go, Rust, TypeScript, Kotlin, Python 3 with type hints)
• Hands‑on DeFi protocol experience, including deploying LP positions on AMMs such as Uniswap, Curve, or Balancer
• Experience using Web3 libraries (web3.js, ethers.js, web3j, or similar)
• Practical knowledge of Docker and/or Kubernetes
• Experience building, monitoring, and maintaining DeFi integrations
• Understanding of EVM internals, gas optimization, and transaction lifecycle management
• Experience with multi‑chain environments (e.g., Ethereum, Arbitrum, Base, Optimism, Polygon)
• Familiarity with financial systems, trading, or risk management is a plus
• Knowledge of real‑time alerting systems (Hypernative, Forta, Tenderly) is preferable
• Understanding of MEV protection, transaction privacy, and institutional custody solutions (Fireblocks, Copper) is also advantageous

Benefits

• Competitive bonus scheme.
• Bupa health & dental, Cycle to Work scheme, enhanced pension, and generous annual leave.
• Enhanced parental leave, special leave allowances, and charity giving options.
• Regular team events, legendary summer & Christmas parties, knowledge sharing sessions, and quarterly town halls.
• Team lunches, dinners, Friday drinks, team sport activities.