request and response
HTTPClear transactions for data, actions, validation, and errors.
API development
Build the layer that lets products talk.
HAAM designs and develops APIs that connect interfaces, data, services, and operations. The work turns an awkward technical boundary into something another team can understand, test, and depend on.
Product interface
Data
API contract
External service
Operations
real-time communication
WSPersistent connections when a product needs live events or updates.
system connections
APIInterfaces that keep different products and services from becoming one tangle.
ownership
ClearBoundaries, failure states, and handover that remain understandable.
The real job
An API is a product boundary, not hidden plumbing.
A technically valid endpoint can still create a bad product. Teams lose time when field meanings are unclear, permissions are implicit, errors cannot be acted on, or real-time behaviour has no reliable state model.
HAAM approaches API work as interaction design between systems. The contract needs to express what each side can ask, what it can expect back, what can fail, and who owns the next action. That clarity helps both the software and the people building it.
How HAAM helps
From a messy integration to a dependable contract.
System boundary
Understand what needs to talk to what.
We map the interfaces, data, services, people, and operational constraints around the integration before choosing endpoints or protocols.
A technical boundary the whole team can understand.API contract
Define the exchange before software depends on it.
Requests, responses, events, permissions, validation, and failure states become explicit enough to review and test independently.
An interface that reduces integration guesswork.Implementation
Build the smallest dependable layer.
HTTP, WebSockets, webhooks, and backend logic are selected according to the behaviour the product actually needs, not because a technology is fashionable.
A working integration with clear responsibilities.Handover
Leave the next developer something usable.
Examples, implementation notes, observable errors, and ownership boundaries make the API easier to operate and extend after the first release.
A system that can survive beyond its original author.
Example / Estonian National Museum / 2016
Four installations. One defined backend responsibility.
Platvorm subcontracted HAAM to develop the API backend for four interactive installations at the Estonian National Museum: Baltikett, Kontaktkeeled, Aavik, and Verbid. The work used HTTP and WebSocket APIs to connect the installation software to the backend layer it depended on.
This is useful evidence of API development precisely because the scope is specific. Platvorm led the exhibition design and production. HAAM owned the defined backend contribution inside that larger team.
Exhibition design and production: Platvorm
What you leave with
A working connection and a boundary people can maintain.
The exact output depends on the system, but the goal stays consistent: reduce uncertainty between teams and make the integration dependable in real operation.
- API and integration architecture
- HTTP, WebSocket, or webhook implementation
- Data contracts and validation rules
- Authentication and permission boundaries
- Error handling and operational visibility
- Integration examples and handover documentation
Bring the hard boundary
Let the systems stay separate without making the experience feel broken.
Bring the product, service, or workflow that needs to exchange data reliably. HAAM can help define the contract, build the integration, and leave the operating model clear.