Lead Engineer

Bullish, Inc.; Greater London; On-site; GBP 70,000 - GBP 90,000; Full time

Job summary

An innovative technology company in Greater London is seeking a Senior Backend Developer with at least 6 years of experience. Candidates should have mastery of the Node.js ecosystem and a strong understanding of DevSecOps practices. The role emphasizes mentorship, collaboration, and quality assurance through effective testing strategies. Familiarity with modern databases and containerization technologies like Docker is essential. A solid grasp of financial markets and blockchain technology would be a significant advantage.

Qualifications

• 6+ years in backend development with a strong track record.
• Mastery of the Node.js ecosystem for scalable services.
• Experience with CI/CD pipelines and infrastructure-as-code.

Responsibilities

• Drive the technical roadmap and operational excellence.
• Mentor and influence team members on best practices.
• Ensure quality and reliability through comprehensive testing.

Skills

Node.js Ecosystem Mastery

Mentorship

Data-Intensive Applications

DevSecOps mindset

Quality Assurance

Tools

Docker

Kubernetes

PostgreSQL

Redis

Prometheus

DataDog

Job description

* Lead-Level Experience: 6+ years in backend development, with a proven track record in a Senior, Lead, or equivalent role where you have moved beyond individual tasks to drive the technical roadmap and operational excellence of critical sub-systems or service portfolios.* Node.js Ecosystem Mastery: Deep technical authority in the Node.js ecosystem, with a track record of leveraging its asynchronous patterns and event-driven architecture to build high-performance, scalable backend services.* High-Level Mentorship & Influence: Proven ability to foster growth in others—whether through direct management or technical coaching—and act as a go-to resource for innovative solutions.* Data-Intensive Application Expertise: Strong practical experience with modern databases (e.g., Redis, PostgreSQL), including schema design, query optimization, and performance tuning for high-throughput workloads.* Full Lifecycle Ownership: A strong "DevSecOps" mindset with expertise in building and maintaining CI/CD pipelines, infrastructure-as-code, and robust observability (monitoring, logging, tracing) for production systems.* Quality as a Feature: A deep commitment to quality, demonstrated by implementing comprehensive testing strategies (unit, integration, end-to-end, performance) that ensure system reliability.* Influence and Collaboration: Exceptional communication skills with the proven ability to influence technical and non-technical stakeholders, articulate complex architectural decisions, and build consensus across multiple teams.* Cloud Architecture: Experience designing and deploying services on a major cloud provider (Azure, GCP).* Blockchain Expertise: A strong understanding of blockchain technology, cryptocurrencies, and decentralized ecosystems is a significant plus.* Financial Market Knowledge: Interest or prior experience in traditional financial markets, trading systems, or investment platforms.* Containerization & Deployment: Proficiency with containerization technologies such as Docker or Kubernetes.* Observability: Hands-on experience with modern observability tooling (e.g., Prometheus, DataDog, Jaeger, OpenTelemetry).* Data Governance: Experience with data privacy (GDPR/CCPA) and security compliance in a regulated financial environment.