API Development and Application Integration
Design secure, well-documented APIs and connect your custom applications with ERP, CRM, content and SaaS systems, on-premises and in the cloud.
Explore integration & data exchange capabilities & delivery details
Also known as API development services, Custom API development, REST API
- API design
- API build and documentation
- API gateway and management
- System integration
- Event-driven integration
- Integration monitoring
- API development services
- Custom API development
- REST API
- GraphQL
- Application integration
- Microservices integration
- Event-driven integration
- Cloud-Native Application Development and MigrationEngineering
- Enterprise Application DevelopmentApplication
- AI Application DevelopmentApplication
What is API development and application integration?
API development is the design and build of application programming interfaces, the contracts that let software systems exchange data and trigger actions securely. Application integration uses APIs, events, messaging and middleware to connect separate applications so data and workflows move between them automatically. TechTiera designs REST and GraphQL APIs, publishes them through API gateways, and integrates custom applications with SAP, Microsoft, Salesforce, content management and SaaS systems.
Reviewed 2026-10-27 by TechTiera's Custom Software Development practiceAPI Development and Application Integration at a glance
- API styles
- REST with OpenAPI, GraphQL, gRPC, webhooks
- Gateways and middleware
- Azure API Management, AWS API Gateway, Apigee, MuleSoft, Kong, Azure Integration Services
- Messaging and events
- Kafka, Azure Service Bus, Event Grid, Amazon SQS and SNS, RabbitMQ
- Security
- OAuth 2.0 and OpenID Connect, API keys, rate limits, OWASP API Security Top 10 testing
- Related practice
- TechTiera Enterprise Integration and EDI services
What does TechTiera's API development and application integration service include?
Consulting, design, engineering, testing and support from one accountable team.
API design
Contract-first design with OpenAPI, versioning rules and clear error handling.
API build and documentation
Fast, secure APIs with developer portals, examples and sandboxes.
API gateway and management
Authentication, throttling, analytics and lifecycle management for internal and partner APIs.
System integration
Custom apps connected to SAP, Oracle, Dynamics, Salesforce, Microsoft 365 and content systems.
Event-driven integration
Events and queues that decouple systems and keep data in step in near real time.
Integration monitoring
Alerts, retries and dashboards so failures are fixed before users notice.
How TechTiera approaches API development and application integration
What makes an API easy to use and safe to run
- Contract first: the OpenAPI definition is agreed before coding, so consumers can build in parallel.
- Consistent design: naming, paging, errors and versioning follow one standard across every API.
- Security by default: OAuth 2.0, least-privilege scopes, input validation and rate limits.
- Observable: every call traced and measured, with alerts on errors and latency.
- Documented: a developer portal with examples so partners integrate without meetings.
Real-time, near real-time or batch?
| Need | Usual pattern |
|---|---|
| A user needs an answer now | Synchronous API call |
| Other systems must react to a change | Events or messages |
| Large overnight volumes | Scheduled batch or file transfer |
Typical use cases
- Partner and customer APIs
- Mobile app back ends
- ERP to custom app integration
- Replacing point-to-point file transfers
- Opening data to AI agents safely
How is the work delivered?
Agile and Design Thinking combined: short sprints, working software every two weeks and users involved throughout.
- DiscoverRequirements gathering with users and owners.
- MapAnalysis and journey and process mapping.
- AssessTechnology capability assessment and architecture.
- Design and buildDesign Thinking and Agile sprints with demos every two weeks.
- ReleaseAutomated testing, CI/CD and controlled launch.
- Run and improveMonitoring, maintenance and a prioritized backlog.
Why choose TechTiera for API development and application integration?
Architects and consultants with large-program experience frame the problem before developers write code.
TechTiera delivers custom code, low-code (Mendix, Power Platform, Appian) and packaged platforms, so the recommendation fits your need.
Every build ships with source code in your repository, tests, pipelines and documentation.
In-house SAP, Microsoft, CRM, integration and content management practices, so custom apps fit the systems around them.
Which engagement models are available?
Onsite, offshore or remote delivery for clients in North America, Europe, the Middle East and Asia Pacific.
Defined scope, deliverables and milestones, usually after a discovery phase.
Flexible capacity for evolving requirements, MVPs and proofs of concept.
A named, cross-functional team working as an extension of yours.
Individual developers, architects and testers added to your team.
SLA-based maintenance, support and enhancements on monthly or annual terms.
API Development and Application Integration FAQs
What is API development?
API development is designing, building, securing and documenting interfaces that let applications exchange data and trigger actions, typically REST or GraphQL over HTTPS.
REST or GraphQL?
REST suits most business APIs and is widely understood. GraphQL suits apps that need flexible queries across many related objects, such as complex mobile or web front ends.
Do we need an API gateway?
If you publish APIs to partners or several internal teams, yes. A gateway handles authentication, rate limits, analytics and versioning in one place.
Can TechTiera integrate custom software with SAP?
Yes. TechTiera integrates custom applications with SAP S/4HANA and ECC through APIs, SAP Integration Suite, events and middleware.
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