Core Engineer - DeFi - London (F/M/D)

Reposted 14 Days Ago
Be an Early Applicant
London, Greater London, England
In-Office
Mid level
Fintech • Cryptocurrency
The Role
Join Flowdesk's Core Engineering team to build a back office system for digital assets, integrating with DeFi protocols and ensuring data accuracy across all financial operations.
Summary Generated by Built In

Flowdesk's mission is to build a global financial institution for digital assets, one designed from the ground up for market integrity and efficiency. To achieve this in a rapidly evolving market, we apply a disciplined, first-principles approach to everything we do.

This approach is embedded in our core services, from institutional liquidity provision, trading solutions, OTC execution to our comprehensive treasury management offerings. This is how we cut through the noise and build robust and scalable systems across all our business lines.

We seek individuals who are driven by this systematic approach. Joining Flowdesk means you will be a key contributor in building and scaling a more transparent and efficient financial markets infrastructure.

Flowdesk is scaling fast, and behind every world-class trading operation is a core engineering team who provide the single source of truth and a scalable platform for business units to leverage. We’re hiring a Core Engineer to join the team and help lead the design and delivery of a new internal platform.

Mission

Be a key player in the newly formed Core Engineering team at Flowdesk to build a world class back office system which will serve as the backbone for Flowdesk's systems. Work alongside a seasoned team with deep product, buy‑side, and sell‑side experience in both Crypto and TradFi.

Tasks

  • DeFi Integrations - Collect all necessary on-chain data and integrate with decentralized protocols to power an accurate, real-time back office system. You will be responsible for ensuring management has a comprehensive, up-to-date view of all on-chain assets. This includes owning the full process from requirements analysis, task specification, implementation, to post-production support.
  • Core Booking / Aggregation - Implement and enhance features in the core booking and aggregation engine (Realised / Unrealised P&L, Balances etc) ensuring performance, reliability and correctness.
  • Reconciliation - Automate reconciliation of all trading and treasury activity across the firm implementing data feeds from internal systems, banking, exchanges and custodians.  
  • Reporting - Work closely with the Finance and other internal users to gather and refine requirements, plan milestones, demo progress, and coordinate cutovers from manual / legacy workflows.
  • Data products and APIs - Expose well-versioned APIs and event streams for downstream consumers; maintain backward compatibility and schema evolution.

Ways of working

  • Follow established architecture and coding standards; participate in RFCs/design reviews and propose incremental improvements within existing patterns.
  • Write clean, well-documented code and meaningful tests.
  • Contribute to PR reviews; maintain up-to-date technical docs and diagrams.
  • Own components end-to-end from spec to production support.

Requirements

Must Haves - Experience

  • Lifecycle knowledge of crypto asset classes: spot, perpetuals, futures, and options (including DeFi implementations).
  • Hands-on integration with Defi protocols (DEX/AMM, lending, derivatives) such as Uniswap v3, Curve, Aave.
  • Proven track record delivering scalable, reliable systems in production.
  • Comfortable partnering with internal stakeholders across Trading, Ops, Compliance, and Engineering.

Must Haves - Technical

  • Strong OO background in one or more, Go, C++, C#, Java or Rust.
  • Experience with Typescript and Python.
  • API design (versioning, backwards compatibility, observability)
  • Postgres schema design and query optimization.
  • Experience with message queue / pub-sub systems.
  • Familiarity with cloud environments (GCP, AWS, Azure), modern CI/CD and containerization.

Nice-to-Haves - Experience

  • Built or maintained position-keeping / accounting systems (PnL, accounting methods, pricing, greeks).
  • Centralized reference data platforms (assets, networks, instruments), consistent symbology and instrument economics.
  • Trading, risk, or back-office systems, ideally in regulated environments.

Benefits
  • International environment (English is the main language)
  • Pension
  • 100% health coverage
  • Team events and offsites

Recruitment Process

  1. HR interview (30')
  2. Technical interview - Hiring Manager (30')
  3. Take home assignment + Live coding session (90')
  4. Team Member Technical (45')
  5. CTO (45")
  6. Chat with the Head of People (30')

We are committed to an inclusive and accessible recruitment process. If you require any reasonable adjustments or have specific needs to enable you to participate fully in the interview or assessment process (e.g., a sign language interpreter, extra time for a test, or an accessible location), please contact us to discuss how we can support you.

Top Skills

AWS
Azure)
C#
C++
Cloud Environments (Gcp
Go
Java
Postgres
Python
Rust
Typescript
Am I A Good Fit?
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The Company
67 Employees
Year Founded: 2020

What We Do

Flowdesk is a globally-based financial technology company with offices in Paris and Singapore.

Founded in 2020, Flowdesk combines significant experience from traditional markets with acute knowledge of algorithmic trading and crypto. We have developed a trading infrastructure which integrates more than 70 centralized and decentralized exchanges. We’ve combined this technology to our expertise to bring the best of crypto finance to our clients, always putting their interests firsts.

Flowdesk provides a wide range of digital assets services such as market-making, custody, brokerage and treasury management. Flowdesk is made by unique individuals who are technologist, innovation driven and convinced by the positive impacts crypto will have on the world. We are putting impact at the heart of everything we do, with the highest level of compliance and ethics.

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