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Senior JavaScript Engineer (Backend / Node.js)

Passa

3.9
2 reviews
Passa
Job Type   /   Job Level
Contract   /   Senior Executive
Job Location
London Area, United Kingdom
Salary Range
GBP 6,600 - GBP 9,200 (Monthly)
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About the role


We are looking for a highly skilled Senior JavaScript Engineer with strong backend expertise in Node.js to join our engineering team. You will design, develop, and optimize scalable backend services and APIs powering mission-critical applications. The ideal candidate is experienced in distributed systems, cloud architecture, and modern JavaScript tooling, with a strong emphasis on performance, reliability, and security.


Responsibilities


• Architect, build, and maintain scalable backend services using Node.js and modern frameworks.

• Design and implement RESTful and/or GraphQL APIs with clean, maintainable code.

• Optimize backend performance, reliability, logging, and observability.

• Collaborate with frontend, DevOps, product, and data teams to deliver complete solutions.

• Write and maintain technical documentation, perform code reviews, and enforce coding standards.

• Manage deployments, CI/CD pipelines, and cloud resources as needed.

• Mentor junior engineers and drive backend engineering best practices.

• Participate in architectural discussions and contribute to long-term system strategy.


Must-have capabilities


• 7+ years of professional experience building backend systems with JavaScript or TypeScript.

• Advanced expertise in Node.js, asynchronous programming, and event-driven architecture.

• Experience with Express.js, Fastify, NestJS, or similar backend frameworks.

• Strong understanding of databases (PostgreSQL, MySQL, MongoDB, Redis, etc.).

• Experience with message queues and event-driven patterns (Kafka, RabbitMQ, SQS, etc.).

• Knowledge of containerization and orchestration (Docker, Kubernetes, ECS).

• Solid understanding of authentication/authorization patterns (OAuth2, JWT, RBAC).

• Experience with distributed systems, microservices, and API versioning.


Nice-to-have capabilities


• Experience with TypeScript at scale.

• Hands-on knowledge of cloud platforms (AWS, GCP, or Azure).

• Experience with serverless technologies (AWS Lambda, Cloud Functions).

• Familiarity with monitoring tools like Prometheus, Grafana, Datadog, or OpenTelemetry.

• Background in high-throughput or low-latency systems.

• Experience implementing automated testing using Jest, Mocha, or similar frameworks.

• Excellent problem-solving and debugging skills.

• Strong communication and cross-functional collaboration abilities.

• Leadership mindset and ability to influence technical decisions.

• High ownership, accountability, and attention to detail.

• Ability to thrive in fast-paced and evolving environments.


How to Apply


Click apply and complete your profile to be considered.

Passa Link: https://joinpassa.com/roles/3a6ea43642e75e28


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Jobs in United Kingdom   »   Jobs in London Area   »   Senior Javascript Engineer (Backend / Node.js)

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