Lead Backend Developer

Role Overview

As a Backend Systems Engineer, youll be responsible for architecting and developing the backend that powers both the web/mobile frontend and our partner-facing API layer. Youll work across the present Microservices, designing Java-based microservices, optimizing message queues, and ensuring that the system maintains reliability, speed, and fault tolerance under high transaction loads. This role requires a deep understanding of distributed systems, system design, and asynchronous architecture. Youll collaborate with product, DevOps, and frontend teams to deliver a unified backend that scales for both direct users and enterprise partners.

Key Responsibilities

Design and develop distributed backend systems in Java (Spring Boot) following microservices principles. Architect & Develop a queue-driven system (SQS/RabbitMQ/Kafka) for processing user and partner API events asynchronously. Build and optimize RESTful and internal APIs for frontend clients and partner integrations. Design and manage PostgreSQL/MySQL databases, ensuring schema scalability and query performance. Implement caching and rate-limiting mechanisms for partner APIs. Collaborate with frontend teams to ensure low-latency, secure data flows between web/mobile clients and backend services. Create detailed system design documents covering entity relationships, service interactions, and message flow through queues. Implement robust authentication and authorization (JWT + API key-based AuthZ) for customers and partners. Ensure fault tolerance, retry mechanisms, and monitoring for queue-based workflows. Conduct load testing, profiling, and scaling exercises to ensure system reliability under growing partner/API load. Maintain technical documentation for APIs, message formats, and service dependencies.

Qualifications

5+ years of hands-on experience in backend development using Java (Spring Boot). Strong understanding of system design, distributed architecture, and concurrency patterns. Experience with message queues (AWS SQS, RabbitMQ, Kafka). Strong SQL skills with experience in PostgreSQL/MySQL, including indexing and optimization. Familiarity with RESTful API design, API key management, and rate limiting. Proficient in writing clean, modular, and well-documented code. Comfortable with CI/CD, containerization (Docker), and cloud infrastructure (AWS). Experience working in agile teams and collaborating with cross-functional developers. Understanding of authentication/authorization (JWT, API keys, OAuth). Solid debugging, performance tuning, and monitoring skills. Experience with microservice orchestration and service discovery. Exposure to multi-tenant systems or partner-facing APIs. Familiarity with Kubernetes and Terraform for infra automation. Experience integrating webhooks, async job processors, or background workers. Must to have: Knowledge of financial services / fintech workflows (KYC, AML, payments, FX). Exposure to event-driven architectures or CQRS patterns.