Custom Software Development
Bespoke systems engineered around your processes.
Learn moreCustom Development
API Development &Integration
Contracts-first APIs, gateways and integrations your partners actually enjoy using.
contract tests gate every release
Charcoal connected endpoint nodes with a FORCE hub and flowing data linesProblems solved
What this removes.
brittle point-to-point integrations
one partner change breaks three flows
undocumented endpoints
tribal knowledge walks out the door
rate-limit incidents
partners get 429s with no explanation
versioning chaos
v2 breaks v1 clients silently
no contract tests
regressions surface in production
What's included
What you get.
- API strategy + domain map
- OpenAPI/AsyncAPI contracts
- REST/GraphQL/gRPC services
- API gateway + auth (OAuth2/OIDC)
- developer portal + docs
- contract test suite
- rate limiting + quotas
- monitoring + alerting
- versioning + deprecation policy
- partner onboarding playbook
Scope
Scope, clearly drawn.
| Core scope | Optional add-ons |
|---|---|
| Corecontract design workshops | Add-ondeveloper portal with sandbox+$5kseeded test tenants |
| Coremock-first build | Add-onlegacy SOAP wrap (per system)+$4kstrangler-friendly |
| Coregateway + auth setup | Add-onevent streaming backbone (Kafka)+$8k |
| Coreintegrations per partner list | Add-onpartner SDKs (TS + Python)+$6kgenerated from contracts |
| Corecontract tests in CI | Tailored to scope |
| Coredocs portal publish | Tailored to scope |
Core scope
- Corecontract design workshops
- Coremock-first build
- Coregateway + auth setup
- Coreintegrations per partner list
- Corecontract tests in CI
- Coredocs portal publish
Optional add-ons
- Add-ondeveloper portal with sandbox+$5kseeded test tenants
- Add-onlegacy SOAP wrap (per system)+$4kstrangler-friendly
- Add-onevent streaming backbone (Kafka)+$8k
- Add-onpartner SDKs (TS + Python)+$6kgenerated from contracts
Our approach
How we run it.
Contract design
OpenAPI/AsyncAPI before code
Mock-first build
partners integrate against mocks
Integration build
services + gateway + auth
Contract tests
CI gates on every change
Publish + monitor
portal, alerts, deprecation policy
Pricing signal
What it typically costs.
Typical range
$15k-$80k
Midpoint $47.5k · final quote after a fixed-scope discovery.
contract tests gate every release
Case evidence
Proof.
weeks -> 1 day
partner onboarding
0
breaking changes in 18 months
5/5Verified client
“Partner onboarding went from weeks to a day.”
Reviews
What clients say.
Slide 1 of 1
- 5/5Verified client
“Partner onboarding went from weeks to a day.”
Head of PlatformHead of Platform, logistics - 5/5Verified client
“Zero breaking changes in 18 months.”
CTOChief Technology Officer, marketplace - 5/5Verified client
“The developer portal answers questions before we get them.”
Partner CTOCTO, payments
FAQ
Questions, answered.
Do you document?
Yes - OpenAPI + Redoc portal, generated from contracts.
Can you wrap legacy SOAP?
Yes - thin adapters first, strangler migration after.
How do you secure APIs?
OAuth2/OIDC, per-partner quotas, WAF, signed webhooks.
What is your versioning policy?
Semantic versioning + published deprecation windows.
Do you consume third-party APIs too?
Yes - anti-corruption layers keep their chaos outside.
How do rate limits behave?
Documented quotas with explanatory 429s and retry-after.
API Development & Integration without the guesswork.
Contracts-first APIs, gateways and integrations your partners actually enjoy using.