Service
API development and system integration
When your applications do not talk to each other, people become the integration layer: copying data, reconciling spreadsheets and chasing errors. Stackvala designs and builds APIs and integrations that move data reliably between your systems.
API and integration services
API development means designing the interface through which software systems exchange data and trigger actions. System integration connects products you already use, such as a CRM, ERP, billing platform, warehouse system or payment gateway, so they share a single version of the truth. Done well, integration removes manual work, reduces errors and makes new products easier to build, because every system can reach the data it needs.
- Custom REST and GraphQL API design and development
- Third-party integrations: CRM, ERP, accounting, payments, shipping, marketing tools
- Webhooks and event-driven workflows
- Legacy system wrappers and data bridges
- Data synchronization, ETL and reconciliation
- API gateways, authentication and rate limiting
Signs you need an integration project
| Symptom | Likely cause | Integration approach |
|---|---|---|
| Staff re-type data between systems | No shared interface | API or workflow automation between the two systems |
| Reports never match | Each system holds its own copy of data | Central source of truth with scheduled or real-time sync |
| New features require touching many systems | Tight coupling | Well-defined internal APIs and an integration layer |
| Vendor changes break your workflows | Direct, fragile connections | Adapter layer that isolates vendor specifics |
| Partners ask for data access | No secure external interface | Documented, versioned public or partner API |
What we build
Custom API development
Versioned, documented REST or GraphQL APIs with authentication and monitoring.
Read about custom API developmentThird-party integrations
Connect SaaS tools, payment providers and marketplaces to your product.
Read about third-party integrationsLegacy system bridges
Expose old systems through modern APIs without a full rewrite.
Read about legacy system bridgesWorkflow automation
Event-driven flows that replace copy-and-paste tasks.
Read about workflow automationKey points
How we design reliable APIs
Contract first
We agree the API specification (OpenAPI) before building, so every team works from the same definition.
Security by default
OAuth 2.0 or token authentication, least-privilege scopes, input validation and rate limiting.
Idempotency and retries
Integrations fail; safe retries prevent duplicate orders and double charges.
Versioning
Changes ship without breaking existing consumers.
Observability
Logs, metrics and alerts so problems are seen before users report them.
Documentation and sandbox
Clear docs and test environments for developers and partners.
Integration architecture options
| Pattern | Good for | Trade-off |
|---|---|---|
| Point-to-point | Two systems, simple flow | Becomes tangled as systems grow |
| Hub and spoke or integration layer | Several systems sharing data | Needs a central component to run and monitor |
| Event-driven (queues, webhooks) | Real-time updates and loose coupling | More design effort for ordering and failure handling |
| Batch or ETL | Reporting and large data loads | Data is not instant |
Our cloud and DevOps team runs these integrations on monitored infrastructure, and QA tests them against failure cases, not just the happy path.
Process and timeline
Map systems
Inventory the systems, data fields and owners involved.
Design contract
Agree the API definition, security model and error handling.
Build and test
Implement in sprints with automated contract tests.
Pilot
Run in parallel with the manual process to compare results.
Switch over and monitor
Cut over with rollback options and live monitoring.
Delivery follows our standard process. Cost depends on the number of systems, quality of their documentation and data volume; see pricing models.
Working with Stackvala
A simple, low-risk way to start
Free discovery call
Share your goal and get a clear recommendation. No obligation.
NDA first
We sign before you share any project details.
Milestone billing
Payments tied to delivered milestones, with written scope.
You own it
Code, designs and documentation are assigned to you.
FAQ
Questions people ask us
Cannot find your answer? Tell us about your project and a real person will reply within one business day.
Contact StackvalaWhat is API integration?
It is connecting software systems through their APIs so data and actions flow between them automatically instead of being handled manually.
Can you integrate with our CRM or ERP?
Yes. We work with common CRMs, ERPs, accounting, payment and shipping platforms, and build adapters where no ready connector exists.
Can you connect a legacy system with no API?
Often yes, through database-level access, file exchange or a wrapper service. We assess options and risks first.
REST or GraphQL?
REST suits most business integrations. GraphQL helps when many clients need flexible queries. We recommend based on your use case.
How do you keep integrations secure?
Authentication, least-privilege access, encrypted transport, validation, rate limits and audit logs.
How long does an integration take?
Simple one-to-one integrations can take a few weeks. Multi-system programmes are phased over months.
Do you document the APIs?
Yes. We deliver OpenAPI specifications, examples and a test environment.
Start a project
Have a project in mind?
Tell us what you are building. A real person reads every request and replies within one business day.
- NDA before you share details
- Written scope and price options
- You own the code