Back End Developer

About GrayQuest GrayQuest is one of India’s fastest-growing fintech companies, focused on building secure and scalable digital lending infrastructure. We design innovative financial products and deliver end-to-end lending solutions used by thousands of institutions and customers. As we expand our technology ecosystem, we are looking for a skilled Senior Backend Developer to help drive our backend architecture, engineering practices and product scalability. Key Responsibilities - Design, develop and maintain scalable backend services using Python (Django, FastAPI) and Go. - Architect and implement high-performance RESTful APIs and microservices supporting lending products, customer journeys and third-party integrations. - Build and optimize event-driven systems using Kafka (Pub/Sub, streaming, task orchestration). - Work with Airflow to orchestrate workflows, schedule jobs and automate complex data pipelines. - Design efficient database schemas and write optimized queries across PostgreSQL, MySQL and MongoDB. - Lead technical discussions, ensure code quality through reviews and mentor junior developers. - Collaborate with product managers, frontend engineers, QA and cross-functional teams to deliver impactful features. - Implement secure, compliant and production-ready systems aligned with fintech regulatory standards. - Containerize services using Docker and contribute to microservices deployment workflows. - Troubleshoot and resolve production issues, ensuring uptime, performance and reliability. - Drive continuous improvements in backend architecture, observability, documentation, and engineering processes. - Stay current with emerging technologies and bring fresh ideas to strengthen our tech stack. Requirements - 3 - 8 years of backend development experience working in both product-based and service-based organizations, with exposure to building scalable platforms and handling diverse client or integration requirements - Strong command over Python, Django/FastAPI. - Proven experience designing and scaling RESTful APIs and distributed microservices. - Hands-on experience with Kafka or similar message queues for event-driven architectures. - Strong proficiency in database design, SQL performance tuning and working with relational + NoSQL systems. - Solid understanding of system design, distributed systems, caching and architectural patterns. - Experience with Git, CI/CD pipelines (GitHub Actions/GitLab/Jenkins) and modern deployment practices. - Demonstrated ability to use AI tools (ChatGPT, GitHub Copilot, Claude Code etc.) to enhance productivity. - Strong debugging skills and experience handling production incidents. - Excellent communication skills and ability to work collaboratively with diverse teams. - Strong problem-solving mindset with ownership and a drive for technical excellence. - Familiarity with monitoring and observability tools — Prometheus, Grafana, ELK Stack, Loki/Promtail, OpenTelemetry. Nice-to-Have / Add-Ons - Knowledge of payment gateway integrations, secure financial APIs and fintech compliance workflows. - Experience with test automation frameworks (PyTest, UnitTest, Behave) and writing integration/E2E tests. - Understanding of API gateway patterns, rate limiting, throttling and authentication standards (OAuth2, JWT). - Experience building developer tooling, internal frameworks or reusable libraries. What We Offer - Opportunity to work on high-impact fintech problems using modern, scalable technologies. - A collaborative culture that encourages ownership, innovation and continuous learning - Direct contribution to building India’s digital lending backbone. - Professional growth, upskilling opportunities and exposure to advanced engineering systems. - Hybrid work model. - Competitive compensation and benefits.