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 LinkedIn.