Real-Time Crypto Backend Engineer (Kotlin/Python) — Remote

United States Digital Space LLC; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

London office

Remote up to 20 days

ClassPass

Learning budgets

Unlimited vacation

Apple equipment

Flexible culture

Job summary

the company is seeking a Back-End Engineer to power its Cryptocurrency Trading Platform, building backend services for order management, market data, and real-time APIs. You will work with product, engineering, and trading teams to deliver scalable capabilities in a high-volume environment.

The role is based in London, with an in-office presence four days per week and a Work from Anywhere policy allowing up to 20 remote days.

Qualifications

• Professional experience building backend services, ideally in Kotlin and/or Python.
• Solid experience designing and building backend services and REST APIs; experience with WebSockets or other real-time streaming protocols such as NATS/JETSREAM is a plus.
• Working knowledge of SQL and experience integrating with multiple internal or third-party services.
• An understanding of performance fundamentals — identifying bottlenecks, managing latency, and building systems that stay responsive under load; experience with real-time or event-driven systems is a plus.
• Strong problem-solving skills and clear communication with both technical and non-technical colleagues.
• Curiosity and enthusiasm for learning new technologies; interest in financial markets or crypto is a plus, not a requirement.
• Familiarity with Docker/Kubernetes and cloud environments (AWS) is a plus.

Responsibilities

• Design, build, and operate backend services in Kotlin and Python that power our trading products, from core trading workflows to client-facing APIs.
• Develop and improve services for order management, market data processing, and trade lifecycle handling in a real-time, high-volume environment.
• Build and maintain REST APIs and WebSocket streams that deliver real-time prices, order updates, and account data.
• Collaborate with cross-functional teams — product, frontend, trading — to adapt the platform quickly to new features and market conditions.
• Ensure high availability, reliability, and scalability of trading services, with a sharp focus on latency, observability, and testing.
• Contribute to architecture discussions and technical decisions, writing clean, maintainable code and sharing knowledge across the team.

Skills

Kotlin

Python

REST APIs

WebSockets

SQL

Performance optimization

Communication

Learning mindset

Docker

Kubernetes

AWS

Tools

NATS/JETSTREAM

Job description

the company is seeking a Back-End Engineer to power its Cryptocurrency Trading Platform, building backend services for order management, market data, and real-time APIs. You will work with product, engineering, and trading teams to deliver scalable capabilities in a high-volume environment.

The role is based in London, with an in-office presence four days per week and a Work from Anywhere policy allowing up to 20 remote days.