Custom Development

API Development &Integration

Contracts-first APIs, gateways and integrations your partners actually enjoy using.

Request estimateSee pricing

contract tests gate every release

Charcoal connected endpoint nodes with a FORCE hub and flowing data lines

Problems 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 is fixed. Add-on prices are indicative — not quotes.

Included in every engagement

contract design workshops
mock-first build
gateway + auth setup
integrations per partner list
contract tests in CI
docs portal publish

Optional add-ons

developer portal with sandbox+$5k
seeded test tenants
legacy SOAP wrap (per system)+$4k
strangler-friendly
event streaming backbone (Kafka)+$8k
partner SDKs (TS + Python)+$6k
generated 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

Full agile development process

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

Estimate your project

Technologies

Tools we reach for.

Case evidence

Proof.

Our team's work, before DosVectis.

Reconciliation time

99.99%Uptime

Payment Orchestration

Payments platform

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.

Related services

Pairs well with.