Node Developer - Cryptocurrency
Client Server
- Location
- United Kingdom
- Job Type
- full-time
- Salary
- £95k
- Posted
- May 12, 2025
Job Description
Do you have strong backend development skills with Node.js combined with a good knowledge of financial markets?
You could be progressing your career in a senior, hands-on Node Developer role at a global cryptocurrency market data and trade execution technology company that is experiencing great success and is growing as a result.
As a Node Developer you will join a small team to design, develop and maintain cutting edge solutions for cryptocurrency market data, ensuring the accuracy, scalability and reliability of index calculation engines in collaboration with product and cross functional teams to deliver impactful features. You'll be building and optimising systems to handle high volume real-time market data streams and also working with clients and business stakeholders to understand requirements and business impact.
Location / WFH:
You'll join the team in brand new Central London based offices three days a week with flexibility to work from home the other two days.
About you:
- You have experience of designing and implementing scalable solutions to handle high throughput systems
- You have advanced backend Node.js and JavaScript / TypeScript coding skills
- You have a strong understanding of financial market data systems and ideally hold a CFA certification
- You have a good knowledge of both relational and non-relational databases, PostgreSQL and Redis preferred
- You have a good knowledge of UNIX based systems for development and deployment
- You have a strong appreciation of DevOps principles including secure coding practices, CI/CD pipelines, automated deployment
- You are degree educated in Computer Science or similar technical discipline
What's in it for you:
As a Node Developer / Backend Software Engineer you will receive a comprehensive package:
- Salary to £95k
- Bonus
- Continual learning and self development opportunities working on cutting edge systems
Apply now to find out more about this Node Developer / Backend Software Engineer (Node.js API JavaScript CFA) opportunity.
At Client Server we believe in a diverse workplace that allows people to play to their strengths and continually learn. We're an equal opportunities employer whose people come from all walks of life and will never discriminate based on race, colour, religion, sex, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. The clients we work with share our values.
🎯 Who is this job for?
This role suits a Senior Backend Node.js Developer with strong experience in building scalable, high-throughput systems, preferably in financial or cryptocurrency markets. The candidate should be skilled in JavaScript/TypeScript, familiar with relational (PostgreSQL) and NoSQL (Redis) databases, and knowledgeable about UNIX systems and DevOps practices including CI/CD and secure coding. Ideal applicants have a technical degree and financial market understanding, with CFA certification as a plus, capable of delivering reliable real-time market data solutions in a hybrid work environment.
💬 Potential Interview Questions
-
How do you design scalable backend systems for high-throughput cryptocurrency market data?
I design systems with event-driven architecture, use message queues, and optimize data processing pipelines to handle real-time streams efficiently and reliably. -
What are your best practices for developing secure Node.js applications in fintech?
I follow secure coding practices like input validation, secure authentication, encryption, proper error handling, and regular security audits to ensure robustness. -
How do you optimize performance in Node.js when processing large volumes of market data?
I use asynchronous programming, clustering, caching with Redis, and optimize database queries to reduce latency and improve throughput. -
Explain your experience working with relational (PostgreSQL) and non-relational (Redis) databases in backend systems.
I leverage PostgreSQL for structured, transactional data with complex queries, while using Redis for caching, real-time data, and fast lookups. -
Describe your approach to building and maintaining CI/CD pipelines for Node.js applications.
I automate testing, build, and deployment stages using tools like Jenkins, GitHub Actions, or GitLab CI, ensuring secure, reliable, and fast releases. -
How do you handle real-time data streams and ensure accuracy in cryptocurrency index calculations?
I implement robust data validation, use atomic operations and distributed locking to maintain consistency and accuracy in high-frequency updates. -
What UNIX/Linux skills do you apply for Node.js development and deployment?
I use shell scripting, process management, system monitoring, and containerization tools like Docker for efficient development and production deployment. -
How does a CFA certification or financial markets knowledge influence your backend development?
It helps me understand domain-specific requirements, data flows, and regulatory considerations, enabling better design of financial-grade software. -
How do you collaborate with cross-functional teams to deliver impactful features in cryptocurrency tech?
I communicate clearly with product managers and stakeholders, translate requirements into technical solutions, and iterate quickly with feedback. -
What strategies do you use to ensure system reliability and fault tolerance in market data applications?
I implement redundancy, failover mechanisms, health checks, monitoring, and alerting to detect and recover from failures seamlessly.
📋 Job Summary
Client Server is seeking a Senior Node.js Developer in London to build scalable, high-throughput backend systems for a leading cryptocurrency market data and trade execution company. You'll work on real-time data streams, index calculation engines, and collaborate cross-functionally to deliver impactful features. The role requires strong Node.js, TypeScript, PostgreSQL, and Redis skills, financial markets knowledge (CFA preferred), and experience with DevOps and CI/CD. Enjoy a flexible hybrid setup, £95K salary, bonus, and ongoing learning opportunities in a diverse, inclusive environment.