Senior Backend Engineer (Java / Spring Boot)

Senior Backend Engineer (Java / Spring Boot)Location: Islamabad (Hybrid / Relocation Required)

About FassetFasset is building secure, compliant, and scalable financial and digital asset platforms. Our Java-based services power core transaction processing and integrations across fintech and Web3 ecosystems.

We are looking for a Senior Backend Engineer (Java / Spring Boot) to design and build resilient backend systems for high-scale financial platforms.

Key Responsibilities

• Design, develop, and maintain high-performance backend services using Java and Spring Boot.
• Build and evolve microservices and event-driven architectures.
• Design and implement API-first services, including REST APIs and WebSockets.
• Implement 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 systems meet security, scalability, and reliability requirements.
• Collaborate closely with architects, product, and DevOps teams.
• Contribute to CI/CD pipelines, deployments, and operational excellence.
• Participate in code reviews and mentor engineers.

Required Skills & Experience

• Strong hands-on experience with Java and Spring Boot in production systems.
• Solid understanding of:
  • Microservices architecture
  • Event-driven systems
  • Distributed system fundamentals
• Hands-on experience with JWT, token-based authentication, and authorization.
• Strong understanding of authentication and authorization patterns, including OAuth2 concepts.
• Experience with REST APIs, WebSockets, and API-first design.
• Strong experience with:
  • Relational databases and schema design
  • NoSQL databases
• Experience with Kafka, RabbitMQ, or similar messaging systems.
• Good understanding of secure coding practices and application security.
• Familiarity with CI/CD pipelines, containers, and cloud platforms (preferably AWS).

Preferred Experience

• Experience in Fintech, Digital Banking, or Web3.
• Experience with high-throughput, low-latency systems.
• Exposure to regulated or compliance-heavy environments.