API Development Services
We help companies build APIs that hold up under real integrations. Based in Montreal and serving clients across North America, Sidekick Interactive designs REST and GraphQL APIs that are secure, well-documented, and easy for other teams to build on.
As an API development company, we don’t just expose endpoints, we design contracts your team and your partners can actually rely on.
Trusted by Organizations
What We Solve
Common API Development Challenges
Brittle integrations that break silently
Undocumented APIs slowing partner onboarding
Security added as an afterthought
No versioning strategy, leading to breaking changes
Legacy SOAP interfaces that are hard to maintain
Third-party integrations that don’t sync reliably
At Sidekick, we design APIs to avoid these problems from the first endpoint, not fix them after they’ve caused an outage.
API Solutions
API Development Services We Provide
REST API Development
We build well-structured REST APIs with sensible resources, consistent status codes, and pagination and caching tuned for performance, predictable endpoints your partners can trust.
GraphQL API Development
We design flexible GraphQL schemas that let your frontend fetch exactly the data it needs, with efficient resolvers, batching, and caching, one endpoint for complex, evolving products.
API Integration & Third-Party Connections
We connect your systems to third-party platforms, ERPs, CRMs, and payment gateways, with reliable data sync, retries, and error handling built into custom API integration services that fit your exact workflows.
Why Companies Choose Sidekick for API Development
Secure by Design
Secure APIs by design, OAuth 2.0, JWT, and least-privilege access from the first endpoint
Clear Contracts
Clean, documented, versioned contracts your team and partners can build against
Built to Scale
Built to scale under real traffic, with caching and observability
Reliable Integrations
Reliable integrations with third-party and legacy systems
Right-Fit APIs
REST and GraphQL expertise, matched to your actual use case
Ongoing Support
Support and monitoring that continues after go-live
Our API Development Process
Discovery & API Design
Foundation & Standards Setup
API Engineering & QA
Security, Integration & Launch
Security & Compliance Checks
Optimize, Support & Scale
We map your systems, data, and consumers, then design the contract and a phased roadmap.
We set conventions, versioning, authentication, and CI/CD so delivery stays consistent and secure.
We build with automated contract, load, and security tests, so reliability is engineered in.
We harden auth and data, connect third-party systems, and manage a controlled go-live.
We implement best practices to protect your data.
We monitor, version, and evolve your APIs as usage grows.
Technologies We Use to Build Reliable APIs
Node.js
Python
.NET
REST
GraphQL
OpenAPI/Swagger
Postman
OAuth 2.0
JWT
Apache Kafka
RabbitMQ
AWS API Gateway
Azure API Management
Need the Infrastructure Behind Your API?
If your project also needs a stronger backend, databases, business logic, server architecture, our backend development services cover exactly that.
Frequently Asked Questions
Do you build both REST and GraphQL APIs?
Yes. We design REST APIs with clean resources and status codes, and GraphQL APIs when clients need to fetch exactly the data they want in one request. We recommend the right approach for your use case.
How do you secure APIs?
Security is built in from the first endpoint, OAuth 2.0 and JWT authentication, fine-grained authorization, encryption in transit, input validation, and rate limiting to prevent abuse.
Can you integrate third-party services like payments, CRM, or ERP systems?
Yes. We integrate payment gateways, CRM systems, ERPs, and other third-party platforms, handling authentication, data mapping, and error handling so integrations stay reliable.
Can you modernize legacy or SOAP APIs?
Yes. We can wrap legacy or SOAP interfaces with modern REST or GraphQL APIs, or replace them in phases, so existing consumers keep working during the transition.
Do you provide API documentation and testing?
Always. Every API we build ships with OpenAPI/Swagger documentation, plus automated contract, load, and security testing.
Do you offer API gateways, versioning, and rate limiting?
Yes. We set up gateways for routing and rate limiting, along with sensible versioning strategies so you can evolve your APIs without breaking existing consumers.
How much do API development services cost?
It depends on the number of endpoints, the complexity of your business logic, and how many systems you’re integrating. We provide an itemized estimate after understanding your goals.