Back-End Engineer, Trading

Blockchain.com; Greater London; Hybrid; GBP 90,000 - 130,000; Full time

Benefits offered by this job

Equity

London office four days a week

Work from Anywhere up to 20 days

ClassPass

Learning & development budgets

Unlimited vacation

Global tech company in crypto

Job summary

Blockchain.com is seeking a Back-End Engineer in London to build and operate the trading platform’s backend services. You will work on order management, market data processing, and real-time APIs, collaborating with product, frontend, and trading teams.

The role emphasizes high availability, low latency, and scalable systems. In-office presence four days per week with a flexible policy for remote work, and meaningful equity on offer.

Qualifications

• Experience building backend services using Kotlin and/or Python.
• Strong background in designing REST APIs and real-time streaming (WebSockets, etc.).
• Working knowledge of SQL and integrating with multiple services.
• Familiarity with Docker/Kubernetes and cloud environments (AWS).

Responsibilities

• Design, build, and operate backend services powering trading products.
• Develop order management, market data processing, and trade lifecycle workflows.
• Build REST APIs and WebSocket streams for real-time data.
• Collaborate with product, frontend, and trading teams to enable new features.
• Ensure high availability, latency optimization, observability, and testing.
• Contribute to architecture discussions and share knowledge.

Skills

Kotlin

Python

REST APIs

WebSockets

SQL

Docker/Kubernetes

AWS

Real-time streaming

Tools

NATS/JETSREAM

Job description

Blockchain 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, Blockchain 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
• The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an emerging field

Blockchain 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. Blockchain makes hiring decisions based solely on qualifications, merit, and business needs at the time.