
Home / Services / Web & Mobile App Development / API & Backend Development
Web & Mobile App DevelopmentAPI & Backend Development
Every great frontend needs a great backend. We design and build scalable API layers and backend systems that serve as the foundation for your web and mobile applications. Whether you need RESTful APIs, GraphQL endpoints, real-time WebSocket services, or complex microservices arch...
Our Process
A proven methodology for delivering API & Backend Development that drives real results.
API Design
We design the API schema, endpoint structure, authentication model, and data contracts collaboratively with your team using OpenAPI or GraphQL schema definitions.
Database Architecture
We design the data model, choose the right database technology, and plan for data migration, indexing, and scaling strategies.
Backend Development
We build the API layer, business logic, and integration points with comprehensive test coverage and clean, documented code.
Infrastructure Setup
We provision cloud infrastructure using IaC (Terraform, Pulumi), set up CI/CD pipelines, and configure monitoring and alerting.
Performance Testing
Load testing, stress testing, and query optimization to ensure the backend meets your performance requirements under production conditions.
Documentation & Handoff
Comprehensive API documentation, architecture decision records, and runbooks that enable your team to maintain and extend the system independently.
Why Choose Our API & Backend Development
The tangible advantages our clients experience when they partner with Semark.
Clean, well-documented APIs that frontend and mobile teams love working with
Scalable architecture that handles traffic growth without rewriting
Sub-100ms response times through optimized queries and intelligent caching
Comprehensive authentication and authorization with industry-standard protocols
Infrastructure-as-code deployments for reproducible, reliable environments
Real-time capabilities via WebSockets and server-sent events when needed
Ready to Get Started?
Let's discuss how our api & backend development services can help your business grow.
Discuss Your ProjectCommon Questions
Answers to the questions we hear most often about api & backend development.
REST is simpler and ideal for straightforward CRUD APIs. GraphQL shines when you have multiple frontend consumers with different data needs. We recommend based on your use case and team familiarity.
Node.js (Express, Fastify, NestJS), Python (FastAPI, Django), Go, and Rust depending on your performance, team, and ecosystem requirements.
We implement versioning strategies (URL-based, header-based, or content negotiation) that allow you to evolve your API without breaking existing consumers.
Yes. We audit existing backends, identify bottlenecks, and implement targeted improvements - database optimization, caching, horizontal scaling, or architectural refactoring as needed.
Yes. We offer DevOps and backend maintenance retainers covering uptime monitoring, security patches, performance optimization, and on-call incident response.
REST uses fixed endpoints that return predefined data structures - simple and widely supported. GraphQL lets clients request exactly the data they need in a single query - ideal when multiple frontends have different data requirements. We recommend based on your use case, team familiarity, and performance needs.
Microservices architecture breaks your application into small, independently deployable services that communicate via APIs. Each service handles one business capability and can be developed, deployed, and scaled independently. This approach improves reliability, enables team autonomy, and allows different services to use different technologies.
API and backend development typically ranges from $20,000 for simple REST APIs to $100,000+ for complex microservice architectures. Cost depends on the number of endpoints, data complexity, authentication requirements, third-party integrations, and infrastructure setup.
Other Web & Mobile App Development Services
Combine multiple services for compounding results.
Custom Web Applications
Bespoke web applications tailored to your exact workflows and user needs, built with React, Next.js, or Vue for maintainable, scalable codebases.
Learn MoreiOS App Development
Native iPhone and iPad applications built with Swift and SwiftUI, optimized for performance, App Store compliance, and seamless Apple ecosystem integration.
Learn MoreAndroid App Development
Native Android applications built with Kotlin and Jetpack Compose, designed for the full range of Android devices and published to Google Play.
Learn MoreCross-Platform Mobile Apps
React Native and Flutter apps sharing a single codebase across iOS and Android - near-native performance at 40-60% lower cost than native development.
Learn MoreE-Commerce & Marketplace Apps
Revenue-driving storefronts and marketplace platforms with seamless checkout, payment integration, inventory management, and multi-vendor support.
Learn MoreUI/UX Design Services
Expert user interface design and user experience research that transforms complex requirements into intuitive, accessible digital products your users love.
Learn MoreComplementary Services
Combine services across disciplines for compounding results.
Custom AI Models & APIs
Custom ML models for recommendation engines, pricing optimization, content generation, and domain-specific problems - trained on your data, served via API.
Learn MoreCustom Web Applications
Bespoke web applications tailored to your exact workflows and user needs, built with React, Next.js, or Vue for maintainable, scalable codebases.
Learn More