Backend & API for Mobile Apps

Well-structured, versioned REST APIs designed specifically around how mobile clients consume data — with consistent response formats, meaningful HTTP status codes, pagination, filtering, and field selection built in from the start. We follow REST best practices and document every endpoint with OpenAPI specifications so your mobile developers can integrate quickly, confidently, and without constant back-and-forth clarification.

Flexible, query-driven APIs that let mobile clients request exactly the data they need — nothing more, nothing less. GraphQL eliminates over-fetching and under-fetching, reduces the number of round-trips on slow mobile networks, and makes it straightforward to evolve your data model without breaking existing clients. Ideal for apps with complex, interconnected data or multiple client types consuming different data shapes from the same backend.

Secure, standards-compliant identity systems using JWT, OAuth 2.0, and OpenID Connect — with mobile-optimized token refresh flows, biometric authentication support, social login (Google, Facebook, Apple Sign-In), multi-factor authentication, and granular role-based access control. We design authentication flows that are secure without being tedious, keeping legitimate users moving and unauthorized access firmly blocked at every entry point.

Event-driven backend systems that push live data to mobile clients — powering chat, live notifications, collaborative features, live dashboards, and real-time order or delivery tracking. We implement WebSocket servers, Server-Sent Events, and managed real-time services like Firebase Realtime Database or Pusher — selecting the right technology for your latency requirements, concurrent connection volume, and infrastructure cost constraints.

Secure server-side payment processing integrated with eSewa, Khalti, ConnectIPS, IME Pay, Stripe, and other gateways relevant to your market. We implement payment initiation, webhook verification, transaction status management, refund handling, and idempotency logic entirely on the server — keeping payment credentials and sensitive transaction data off the mobile device and ensuring no payment is counted twice or silently lost during network failures.

Reliable, scalable notification delivery systems built on Firebase Cloud Messaging (FCM) and Apple Push Notification Service (APNs) — with device token management, topic-based broadcasting, user segmentation, notification scheduling, delivery tracking, and retry logic for failed deliveries. We build notification backends that handle millions of messages reliably, giving your app a direct, permission-based channel to re-engage users long after they close the app.

Thoughtful data modeling and database design using MySQL, PostgreSQL, MongoDB, or Redis — selected and structured for your app’s specific query patterns, relationship complexity, and read/write ratios. We design schemas that stay performant as data volumes grow, implement strategic indexing, query optimization, and caching layers, and establish backup and replication strategies so your data is always fast to access and impossible to lose unexpectedly.

Server-side sync architectures that reconcile data between mobile clients and the backend after periods of offline use — handling conflict detection, resolution strategies, delta sync, and optimistic concurrency control. Reliable offline sync is technically one of the hardest problems in mobile backend development; we design systems that handle edge cases gracefully so users never lose data and never see inconsistencies, regardless of how poor their connection was when they made changes.

Seamless server-side connections to the external services your app depends on — mapping services, SMS gateways, email providers, CRM platforms, ERP systems, social platforms, analytics pipelines, and cloud storage. We build integration layers with proper error handling, rate limit management, credential rotation, and response caching so your app’s dependency on external services never becomes a point of fragility or unexpected downtime for your users.

Comprehensive API security hardening — including rate limiting and throttling to prevent abuse, input validation and sanitization against injection attacks, CORS policy configuration, API key management, request signing, and protection against common OWASP mobile API vulnerabilities. We treat security as a foundational engineering concern, not a checklist item — building defenses into the API architecture rather than patching them on after the fact.

Comprehensive, accurate API documentation using OpenAPI (Swagger) specifications, with interactive testing environments, code samples in multiple languages, authentication guides, error code references, and versioning changelogs. Well-documented APIs dramatically reduce mobile integration time, eliminate ambiguity between frontend and backend teams, and make your API a reliable, professional product — whether consumed by your own developers or external partners and integrators.

Ongoing care to keep your backend healthy, secure, and evolving with your product. We provide dependency updates, security patching, database performance tuning, API versioning management, infrastructure scaling, error monitoring and resolution, and feature additions as your app grows. A mobile app is only as reliable as the backend powering it — our maintenance plans ensure server-side issues are caught and resolved before your users notice them.