Senior Software Engineer(Backend)

OnArrival

Bengaluru, IndiaPosted Aug 5, 2026

About OnArrivalOnArrival is building the infrastructure layer for modern travel distribution. We enable banks, fintech companies, loyalty platforms and consumer brands to offer flights, hotels, buses and travel services directly inside their own applications.Our platform handles the complexity behind travel commerce, including supplier integrations, search, pricing, booking, payments, cancellations, rescheduling, reconciliation and post-booking support. We operate across APIs, SDKs and embedded user experiences, allowing our partners to launch travel products without building an entire travel stack themselves.The RoleWe are looking for a Backend Engineer who can build reliable, scalable and maintainable systems for a high-volume travel platform.You will work on systems that process real customer searches, bookings and payments across multiple travel suppliers. This is not a role where you only implement isolated tickets. You will own services and workflows from design through production, monitor how they perform and improve them based on real-world usage.You will work closely with product managers, frontend engineers, QA engineers, solution architects and external travel partners.What You Will Work On<ul><li>Build backend services using Kotlin, Java and Spring Boot</li><li>Design APIs for search, pricing, booking, payments, cancellations, rescheduling and refunds</li><li>Integrate with airline, hotel, bus, payment and third-party travel APIs</li><li>Build resilient workflows that handle supplier failures, timeouts, retries and partial transactions</li><li>Design asynchronous systems using Kafka, SQS and event-driven architecture</li><li>Work with MongoDB, Redis, PostgreSQL, Elasticsearch and ClickHouse</li><li>Improve API response times, throughput, reliability and infrastructure efficiency</li><li>Build configurable systems that support multiple enterprise customers and tenant-specific requirements</li><li>Implement idempotency, distributed locking, caching, rate limiting and fault-tolerance patterns</li><li>Write automated unit, integration and contract tests</li><li>Own production releases, observability, alerts and incident resolution</li><li>Investigate production issues using logs, metrics, traces and database analysis</li><li>Participate in architecture discussions and technical design reviews</li><li>Improve engineering standards, documentation and development tooling</li></ul>AI-Native EngineeringAt OnArrival, engineers are expected to use AI extensively as part of their everyday work.You should be comfortable using AI coding and reasoning tools to:<ul><li>Accelerate implementation and code exploration</li><li>Generate and improve automated tests</li><li>Review pull requests and identify edge cases</li><li>Understand unfamiliar services and large codebases</li><li>Debug production issues and analyse logs</li><li>Draft technical designs and documentation</li><li>Automate repetitive engineering tasks</li><li>Evaluate multiple implementation approaches before writing code</li></ul>AI should improve your speed and quality, but you remain responsible for validating the output, protecting customer data and making sound engineering decisions.What We Are Looking For<ul><li>3 or more years of backend development experience</li><li>Strong programming skills in Kotlin or Java</li><li>Hands-on experience with Spring Boot</li><li>Good understanding of REST APIs, HTTP, authentication and distributed systems</li><li>Experience with relational or NoSQL databases</li><li>Understanding of concurrency, transactions, caching and asynchronous processing</li><li>Ability to write clean, testable and production-ready code</li><li>Experience diagnosing performance and reliability issues</li><li>Strong ownership mindset and comfort working in a fast-moving environment</li><li>Ability to convert ambiguous business problems into well-designed technical solutions</li><li>Comfortable using AI-assisted development tools as part of the software development lifecycle</li></ul>Good to Have<ul><li>Experience with Kafka, Redis, MongoDB, Elasticsearch or ClickHouse</li><li>Experience running services on AWS using ECS, EKS, Lambda, SQS, S3 or CloudFront</li><li>Experience with observability platforms such as Grafana, OpenTelemetry, Datadog or SigNoz</li><li>Experience building multi-tenant SaaS platforms</li><li>Knowledge of microservices, event-driven architecture and distributed transaction patterns</li><li>Experience with payment systems, booking systems or financial reconciliation</li><li>Experience integrating with external APIs that have inconsistent behaviour or limited reliability</li><li>Previous experience in travel technology, fintech, e-commerce or another transaction-heavy domain</li></ul>What Success Looks LikeWithin your first few months, you should be able to:<ul><li>Independently understand and contribute to core backend services</li><li>Take ownership of a production workflow from design to monitoring</li><li>Ship features with strong test coverage and minimal production regressions</li><li>Improve the performance or reliability of at least one critical service</li><li>Diagnose incidents systematically instead of relying on manual trial and error</li><li>Use AI tools to materially improve engineering speed without reducing code quality</li><li>Contribute to better architecture, tooling and development practices across the team</li></ul>Why Join OnArrival<ul><li>Work on complex, real-world systems used by banks, fintech companies and consumer platforms</li><li>Solve problems involving high-volume search, bookings, payments and supplier integrations</li><li>Own meaningful systems instead of working on small isolated components</li><li>Build infrastructure that can become the action layer underneath the next generation of travel experiences and AI agents</li><li>Work in an engineering culture that values speed, accountability, experimentation and measurable outcomes</li><li>Use modern AI tools as a core part of how software is designed, built and operated</li><li>To apply: Share your resume, GitHub profile or examples of backend systems you have built, along with a brief description of the most difficult production problem you have solved.</li></ul>