Back-End Engineer, Trading

United States Digital Space LLC; Greater London; On-site; 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 connecting the world to the future of finance. As the most trusted and fastest-growing global crypto company, it helps millions of people worldwide safely access cryptocurrency. Since its inception in 2011, the company has earned the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions.

As a Back-End Engineer on our Cryptocurrency Trading Platform, you will build the backend services that power our internal and external trading products — from order management and market data processing to the REST APIs and WebSocket streams that serve our web and mobile clients. You'll work closely with product, engineering, and trading teams, and contribute to our culture of engineering excellence. The role is based in London and the team is international.

WHAT YOU WILL DO

• 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.

WHAT YOU WILL NEED

• 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.

COMPENSATION & PERKS

• Full-time salary based on experience and meaningful equity in an industry-leading company
• Role based in our London office, with a mandatory in-office presence four days per week
• Work from Anywhere Policy - up to 20 days to work remotely
• ClassPass
• Budgets for learning & professional development
• Unlimited vacation policy; work hard and take time when you need it
• Apple equipment
• The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an emerging field
• Flexible work culture

the company is committed to diversity and inclusion in the workplace and is proud to be an equal opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, color, national origin, gender, gender expression, sex, sexual orientation, age, marital status, veteran status, disability status or any other characteristic protected by law. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, and apprenticeship. the company makes hiring decisions based solely on qualifications, merit, and business needs at the time.