Since 2014, Syndicode has designed and built custom APIs for businesses in fintech, healthcare, logistics, SaaS, and e-commerce — from simple third-party integrations to full-scale GraphQL backends and microservices architectures. We take an API-first approach: designing the interface contract before writing a single line of code, ensuring every API we deliver is secure, well-documented, and built to last.
Modern software runs on APIs. They connect your product to the services your users expect and to the data your business depends on.
74% of developers have adopted an API-first development approach (Postman State of the API, 2024)
The global API management market is projected to reach $32.77B by 2032 at a 25% CAGR
The average modern application is powered by 26–50 APIs
The AI API market reached $48.5B in 2024 and is growing at 31.3% annually
90% of developers use APIs in their work; 69% rely on third-party APIs
Our professional developers guide you through the full API lifecycle — from architecture selection and design through development, testing, documentation, and operational monitoring. We help you select the right API paradigm — REST, GraphQL, or gRPC — based on your data model, client requirements, and performance goals. Every API we build is designed API-first: the contract is defined before the code is
We enable secure, reliable data sharing between your custom solutions or third-party software. Custom APIs let you extend product functionality and add business logic without altering existing structures. We design and build APIs for microservices architectures, internal platform integration, and external developer ecosystems — ensuring your API is clean, versioned, and maintainable as your product evolves.
GraphQL gives your clients precise control over what data they request — eliminating over-fetching, simplifying frontend integration, and reducing the number of round trips required for complex UIs. We design GraphQL schemas, define types and resolvers, implement query depth limiting and pagination, and optimize performance for mobile-first and data-intensive applications. Ideal when your frontend and mobile teams need flexibility that REST cannot cleanly provide.
We build APIs that give mobile apps fast, reliable access to multiple data sources — analytics, payments, geolocation, push notifications, and more. We also design APIs that connect your business tools, turning your mobile app into a central operational hub. Performance and offline-resilience are built into the architecture from the start.
Cloud API development enables database integration, IoT connectivity, and scalable backend services without the overhead of on-premises infrastructure. We combine pre-built cloud capabilities with custom logic to accelerate delivery while reducing long-term infrastructure costs. We work across AWS, Google Cloud, and Azure — using their native API gateway and management tools where appropriate.
We use web APIs to build products intended for broad audiences across browsers and devices. Web API integrations are lightweight, highly maintainable, and perform well even on bandwidth-constrained devices — making them the right choice for public-facing platforms, partner integrations, and developer-facing products.
We integrate your product with any third-party service via its API — adding payment processing, messaging, mapping, authentication, analytics, or any other capability your product needs. Third-party integration typically delivers the required functionality in hours rather than weeks, without building from scratch.
Once your API is live, it needs to be operated — not just hosted. We implement API gateway solutions with traffic control, rate limiting, API key management, and version routing. Our monitoring setup tracks usage metrics, response latency, error rates, and uptime — giving you full operational visibility. We support Kong, AWS API Gateway, and Nginx depending on your infrastructure requirements.
Syndicode consultants assess your existing API integrations and management processes, identify security or scalability issues, and help you define a long-term API strategy. We advise on architecture selection (REST vs GraphQL vs gRPC), microservices design, API governance frameworks, and toolchain modernization.
Our API development services enable your software to access and manipulate data from any source — from processing payments and managing logistics workflows to empowering your customers to build on top of your product’s API.
See more projectsNeed an API that’s secure, well-documented, and ready to scale? Our custom API development company will integrate your product with any service of your choice.
Get in touchWe build APIs that are tools, not obstacles — concise, easy to use correctly, and hard to misuse.
We design the API contract before writing application code. Using OpenAPI 3.0 (Swagger) specifications, we define endpoints, request/response schemas, authentication models, and error responses upfront. This enables parallel frontend and backend development, automatic documentation generation, and a clear integration contract for any third-party consumers — reducing misalignment and rework across the entire project.
We think through all realistic use cases when designing an API. We build APIs that deliver accurate, up-to-date information quickly and error-free — whether it’s powering flight booking, real-time graphics, social interactions, or financial data feeds. Your end users get excellent UX every time they touch a feature built on the API.
Our custom APIs come with detailed documentation covering authentication, endpoints, request/response formats, error codes, and integration examples. We design entry points and permission structures to protect users by default. Well-documented APIs reduce integration time, lower maintenance costs, and increase adoption by internal and external developers.
We ensure uniformity in naming conventions, response formats, versioning, and error handling across the entire API surface. Consistent APIs are faster to learn, easier to maintain, and interoperate cleanly with the rest of your codebase — without surprises.
We separate internal data models from the API object schema. This means you can refactor internals without breaking API consumers, and the API can evolve independently without accumulating technical debt. We select the paradigm that fits your audience and use cases — not the one that happens to be trending.
APIs aggregate data from multiple sources into a single interface — turning your application into a unified decision-making tool that reflects the full picture of your operations in real time.
APIs provide required functionality without building it from scratch. API-driven development also decouples frontend and backend teams, allowing parallel work streams and faster iteration cycles.
APIs connect software across departments — letting data flow seamlessly between your CRM, ERP, logistics platform, analytics tools, and customer-facing products. Everyone works from the same source of truth.
APIs encourage modular architectures that scale independently in response to traffic demands — outperforming monolithic systems in elasticity and reducing the cost of handling usage spikes.
APIs are at the core of cloud infrastructure. They connect your application to cloud service providers, SaaS platforms, and managed services — giving you greater flexibility, reduced IT overhead, and the ability to swap components without rebuilding the product.
Our API development company will connect them into one application — seamlessly, securely, and with full documentation from day one.
Leave a noteAfter looking at your web server, we can decide on the API development tools since APIs are written in the same languages. Below are our most commonly used languages and frameworks. Let us know if you need something else: we might have the right professional for you.
Our custom API development services help companies across industries meet internal integration needs, satisfy customer expectations, ensure regulatory compliance, and extend their platform’s capabilities to partners and developers.
We build APIs that enable real-time inventory, cross-channel shopping, payment processing, and seller/buyer data exchange — with the scalability to handle high-traffic peaks and the security to protect customer data.
We integrate voice, video, SMS/MMS, and instant messaging into your product via APIs — enabling rich communication features without building the underlying infrastructure. Twilio, Vonage, and proprietary communication backends supported.
We build APIs for live-streaming services, media content aggregators, gaming backends, and real-time social features — designed for high concurrency and low-latency data delivery.
We help SaaS companies build public APIs and developer ecosystems — enabling customers to integrate your platform with their own tools, automate workflows, and build on top of your product. Includes API versioning, developer documentation, and API key management.
We connect carriers, shippers, warehouse management systems, and supply chain partners through custom API integrations — with support for shipment tracking, automated billing, POD document exchange, and real-time route data.
We build and integrate APIs for flight and hotel availability, real-time scheduling, booking engines, mapping, pricing, and review aggregation — connecting your platform to GDS providers and travel data services.
We build PCI-DSS compliant payment processing APIs, Open Banking integrations (supporting Plaid, Stripe, and PSD2 standards), real-time market data feeds, and financial reporting APIs.
We develop HIPAA-compliant healthcare APIs that integrate with EHR/EMR systems via HL7 and FHIR standards.
Many clients worldwide consider Syndicode a reliable outsourcing partner for API development. We bring cross-industry expertise, an established team, and a commitment to security and transparency that reduces risk throughout the engagement.
Our developers are proficient across multiple backend languages and have deep understanding of REST, GraphQL, and gRPC architectures. We follow API-first practices — translating client requirements into practical, documented, production-grade interfaces. We select the right API paradigm for each use case, not the one we happen to know best.
We implement OAuth 2.0 and JWT-based authentication, API key management with rotation policies, rate limiting and throttling, input validation, and protection against the OWASP API Security Top 10. Our APIs comply with GDPR, HIPAA (healthcare clients), PCI-DSS (payment APIs), and use TLS encryption for all data in transit.
We follow Agile delivery with full stakeholder visibility. You’re added to project boards where you can monitor progress and leave comments in real time. Regular progress reports and online project meetings keep you informed at every stage. We sign an NDA and service agreement before work begins.
API development is the process of designing, building, and integrating an application programming interface — the component that lets software products communicate with each other. An API acts as an intermediary between two applications, enabling controlled data exchange without exposing internal systems. API development involves selecting the right architecture (REST, GraphQL, gRPC), designing the data contract, implementing security, writing the code, testing, documenting, and deploying — and then monitoring and maintaining the API in production.
REST uses standard HTTP methods and is ideal for most public-facing and mobile applications — well understood, easy to cache, and widely supported. GraphQL is better suited for complex data requirements where clients need flexibility in what they query, reducing over-fetching and the number of requests required by rich UIs. gRPC uses Protocol Buffers for binary serialization and is preferred for high-performance internal microservices communication where latency and bandwidth efficiency are critical. We recommend the right architecture for your specific use case during discovery.
The most widely used tools for API development and testing include Postman and Insomnia for design and testing, Swagger UI and OpenAPI 3.0 for specification and documentation, Newman for automated test runs, and k6 for load testing. For API gateways and management, we work with Kong, AWS API Gateway, and Nginx. Testing frameworks include REST-assured and Dredd for contract testing. We adapt the toolchain to your team’s existing workflow where possible.
Most API work is delivered as part of a broader project, which makes standalone pricing variable. As a general guide: a basic third-party integration (payment gateway, SMS service, mapping) typically requires 8–20 hours of development. A custom internal API with authentication, validation, and documentation usually takes 40–100 hours. Complex API development involving multiple endpoints, security requirements, and enterprise system integrations can range from 100–200+ hours. Hourly rates vary by region: US/Australia teams typically charge $160–$250/hr; Syndicode’s European-based rates run $45–$80/hr depending on seniority. We provide scoped estimates after an initial consultation.
Yes. We design and build API layers that connect your applications to AI services — including OpenAI, Anthropic Claude, Google Gemini, and AWS Bedrock. Whether you’re adding an LLM-powered feature to an existing product, building a conversational interface, or creating an AI-native application, we architect the integration for security, latency optimization, token cost management, and fallback handling. This is one of the fastest-growing integration patterns we work with.
APIs let developers add functionality without building it from scratch — accelerating development and reducing cost. They connect software across your organization, improving data flow and transparency. They enable data collection on user behavior and business performance. They power automation — eliminating manual data transfers between systems. And they make your platform extensible — allowing customers, partners, and developers to build on top of your product, expanding its value and reach.
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