Senior Backend Engineer (Node.js)

Location: Islamabad (Hybrid / Relocation Required)

About Fasset

Fasset is building regulated, enterprise-grade financial and digital asset infrastructure. Our backend systems power transaction processing, digital banking, and Web3 platforms with a strong focus on security, scalability, and compliance.

We are looking for a Senior Backend Engineer (Node.js) to design, build, and own backend services powering mission-critical financial systems.

Key Responsibilities

• Design, develop, and maintain scalable backend services using Node.js.
• Build and operate microservices and event-driven systems.
• Design and implement API-first services, including REST APIs and WebSockets.
• Implement and maintain authentication and authorization mechanisms, including JWT-based security.
• Integrate identity, access control, and role-based authorization into backend services.
• Work with Kafka, RabbitMQ, or similar messaging platforms.
• Ensure backend services meet security, performance, and compliance requirements.
• Collaborate closely with Solution Architects, Product Managers, and DevOps teams.
• Contribute to CI/CD pipelines, cloud deployments, and production readiness.
• Participate in code reviews and mentor junior engineers.

Required Skills & Experience

• Strong hands-on experience with Node.js in production environments.
• Experience building backend services using frameworks such as NestJS, Express, or similar.
• Solid understanding of:
  • Microservices architecture
  • Event-driven systems
  • Distributed systems fundamentals
• Hands-on experience with JWT, token-based authentication, and authorization flows.
• Strong understanding of authentication protocols and patterns (e.g., OAuth2 concepts).
• Experience with REST APIs, WebSockets, and API-first design.
• Strong experience with:
  • Relational databases (PostgreSQL, MySQL, etc.)
  • NoSQL databases
• Experience with Kafka, RabbitMQ, or similar solutions.
• Familiarity with secure coding practices and backend security best practices.
• Experience with CI/CD pipelines, containers, and cloud platforms (preferably AWS).

Preferred Experience

• Experience in Fintech, Digital Banking, or Web3.
• Exposure to high-throughput, transaction-heavy systems.
• Experience working in regulated or compliance-driven environments.