Repeated data entry between systems
DEVNU / SERVICE
API and system integration
For securely connecting services, payments, messaging, legacy systems, and fragmented data through explicit contracts, logs, and failure paths.
Teams whose operations are split across software, external APIs, files, or messaging and need one traceable flow.
The problem should have observable signals.
Webhooks without validation or history
External failures lose business actions
API contracts are undocumented or unversioned
Data ownership, input and output contracts, idempotency, timeouts, retries, and fallback are defined for every integration before implementation.
TYPICAL DELIVERABLES
01REST APIs and OpenAPI contracts
02Secure, signed webhooks
03Data synchronisation and transformation
04Queues, retries, and dead-letter paths
05Logs and correlation IDs
06Integration tests and failure runbooks
04 / TECHNOLOGY IN CONTEXT
Tools follow the constraints and operating model.
No technology enters a project to pad a stack list. Maintenance cost, team capability, security, and upgrade paths shape the choice.
- NestJS
- REST
- OpenAPI
Every phase closes with an explicit decision.
- 01
Understand
We inspect the problem, users, current workflow, and risks.
DECISION: Is the problem clear and valuable enough to solve? - 02
Define
Scope, first-release priorities, constraints, and acceptance criteria are written down.
DECISION: What explicitly stays outside this release? - 03
Design
Flows, content, interface states, and bilingual behaviour are designed.
DECISION: Does the core path work with real data? - 04
Engineer
Interface, APIs, data, integrations, and tests are built in reviewable releases.
DECISION: Have acceptance criteria and failure scenarios passed? - 05
Launch and Improve
Deployment, data transition, monitoring, and support paths go live.
DECISION: What does the evidence—not assumption—say to improve next?
Questions worth answering before work begins.
01What if the external service has no suitable API?+
Official exchange paths are assessed. Fragile or terms-breaking methods do not enter production without an explicit risk decision.
02How are duplicate actions prevented?+
Unique identities, state machines, database constraints, and idempotent behaviour are designed for the workflow.
03Is API documentation included?+
Endpoint contracts, authentication, example payloads, errors, and local or production operation are documented within scope.
08 / NEXT STEP
Define the problem before estimating the solution.
The initial inquiry clarifies scope, risk, and the right engagement model—not a premature promise on cost or timing.
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