Senior Backend Developer

Senior Backend Developer (Java) – Blue Enigma 📍 Location: Hybrid (Sector – 132 ,Noida, India) 💼 Role Type: Full-Time 🔹 Company Description Blue Enigma is a deep-tech, AI & product engineering company building next-generation systems at the intersection of AI, distributed systems, and global-scale web platforms. We are operating in Stealth Mode, creating the backend infrastructure that powers: - Global hotel & flight booking engines - AI-driven dynamic pricing & demand forecasting systems - High-traffic search, inventory, and reservation microservices - Scalable travel-tech platforms engineered for millions of users - Real-time integrations with payment gateways, suppliers & GDS APIs You will join the core engineering team building the foundation for a world-class travel platform — architecting search, pricing, booking, payments, and availability systems that compete with players like Booking.com & MakeMyTrip. 🔹 About the Role – Senior Backend Developer (Java / Spring Boot) We are hiring Senior Backend Developers with strong Java expertise to design and build mission-critical backend systems for our global travel infrastructure. - Search & availability engines - Pricing & margin systems - Booking and payment orchestration - Distributed microservices for travel inventory - High-performance APIs serving millions of requests This is a high-ownership, high-impact role where you shape the core product that powers all user-facing flows. 🔹 Responsibilities Backend Architecture & Microservices - Architect and develop backend systems using Java 11+, Spring Boot, JPA/Hibernate - Build scalable APIs for hotels, flights, bookings, payments, and user systems - Design domain models, state machines, queues, caching layers, and workflows - Implement idempotency, retries, consistency guarantees, and fault tolerance Search, Pricing & Booking Flows - Build low-latency services for search, filtering, availability, and pricing - Integrate with internal pricing engines and caching systems - Work on booking flows requiring transactional correctness and reliability Integrations - Integrate with external travel suppliers, hotel partners, GDS/NDC APIs - Integrate with payment gateways (Razorpay, Stripe, PayU, UPI) - Handle API authentication, rate limits, SLA constraints, and failover logic Performance, Reliability & Observability - Implement circuit breakers, fallbacks, rate limiting (Resilience4J) - Optimize APIs for high throughput and sub-200ms latencies - Work with logs, metrics, dashboards, and distributed tracing - Collaborate with DevOps on AWS deployments, CI/CD, and scaling Team Leadership - Review code, support junior engineers, and enforce best practices - Drive technical decisions, architecture reviews, and sprint planning 🔹 What You’ll Bring Must Have - 4+ years experience in backend development - Strong proficiency in Java 11+, Spring Boot, REST APIs - Experience designing and scaling microservices - Strong database skills (PostgreSQL/MySQL) including indexing & optimization - Experience with caching: Redis / ElastiCache - Hands-on experience with queues: Kafka / RabbitMQ / SQS - Strong understanding of: - Transaction boundaries - Concurrency - Distributed systems fundamentals - Idempotency and consistency patterns - Experience with Docker, CI/CD, and cloud environments (AWS preferred) Nice to Have - Experience with travel-tech, booking systems, payments, inventory, or search - Experience with OpenSearch/Elasticsearch - Exposure to GDS/NDC, hotel suppliers, or B2B integrations - Knowledge of gRPC, DDD, or hexagonal architecture - Experience with high-traffic consumer apps Mindset (Important) - Ownership-driven, reliable, and detail-oriented - Passion for system design, scalability, and backend craftsmanship - Thrives in fast-paced, high-autonomy startup environments 🔹 What We Offer - Chance to architect global-scale travel infrastructure - Great Work Culture & Great People - Work on high-performance systems used by millions - Opportunity to design modules from scratch (no legacy baggage) - Remote-first work culture with complete autonomy - Fast career growth into Tech Lead / Principal Engineer roles - Access to AI-driven engineering workflows, tooling & automation - Contribute to patents, internal frameworks, and open-source releases - Good Amount of ESOPs 🔹 How to Apply Send your resume + GitHub/Kaggle/portfolio link. Or DM us directly here on .