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

Dubizzle Limited; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A financial technology firm in London is seeking a skilled Core Engineer to lead the design and delivery of a new internal platform. This role involves integrating on-chain data with decentralized protocols and enhancing core booking systems. The ideal candidate will have expertise in crypto asset classes and strong OO programming skills in languages such as Go or C++. This position offers 100% health coverage and team events, contributing to a dynamic international environment.

Benefits

International environment

Pension

100% health coverage

Team events and offsites

Qualifications

• Lifecycle knowledge of crypto asset classes including futures and options.
• Experience with Typescript and Python is required.
• Strong OO programming background in Go, C++, C#, Java, or Rust.

Responsibilities

• Collect on-chain data and integrate with decentralized protocols.
• Implement features in the core booking and aggregation engine.
• Automate reconciliation of all trading and treasury activities.

Skills

Integration with DeFi protocols

API design

Postgres schema design

Strong OO programming

Hands-on with crypto asset classes

Tools

Go

C++

Java

Typescript

Python

Job description

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.

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.

• 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.