Lead Backend Developer

Role Overview

As a Backend Systems Engineer, you'll be responsible for architecting and developing the backend that powers both the web/mobile frontend and our partner-facing API layer. You'll 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. You'll 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.