Tangensys • Plan, deliver, measure
Node.js development
Design APIs and background work around reliable data movement. Handle timeouts and repeated requests deliberately rather than treating them as rare exceptions.
The work to plan together
A scope shaped around this requirement.
- API design and buildScope
- Database designReview
- IntegrationsCheck
- Be foundSearch, maps and AI answers
- Be chosenClear pages and offers
- EnquiryCall, WhatsApp or form
- Follow-upYour team responds
In short
What does Node.js development involve?
Node.js development builds back ends, APIs and real-time services in JavaScript.
When Node.js development is a useful fit
Apps needing APIs
Agree API inputs, permissions, response formats and how failed requests are handled.
Real-time features such as chat
Define connection, reconnection and message-state behaviour before building live updates.
Integrations and automation
Handle retries and duplicate events so a repeated request does not repeat a business action.
Problems worth addressing first
Use these situations to identify the work that deserves attention before expanding the scope.
- The back end cannot scale
- Systems need connecting through APIs
A practical example
An order notification can be retried without creating a second order if requests use a stable identifier and processing is recorded.
This is an illustrative scenario to explain the approach, not a claimed client project.
The work we can include
The final quote identifies the deliverables, quantities, approvals and exclusions. Select the work that serves your goal rather than assuming every item is required.
- API design and build
- Database design
- Integrations
- Deployment and monitoring
Where we usually begin
Database changes, external APIs, hosting and monitoring affect the architecture. Capacity targets are specified before making scaling claims.
Practical detail
An API contract that handles repeated requests
An illustrative enquiry endpoint receives a request from a website and passes it to a CRM. Repeated requests and unavailable downstream services are part of the normal test plan.
| Part of the work | Example output | How to review it |
|---|---|---|
| Request contract | Required fields, accepted types and validation errors | An incomplete request returns a useful error without creating a partial record. |
| Duplicate rule | A stable request identifier and defined retry behaviour | The same accepted request does not create two CRM leads. |
| Failure path | Timeout, retry limits and a failed you can review-job record | A downstream failure is visible and can be reconciled. |
| Operations handover | Deployment settings, health checks and log guidance | The owner can distinguish a rejected request from a failed integration. |
Secrets belong in the agreed environment, not in a public client application or a handover email. Rate, capacity and support commitments follow the actual scope.
Define reliable behaviour beyond a successful request
A Node.js service needs a clear contract for inputs, outputs and failure cases. An endpoint that works once in a demonstration may still need validation, access control and retry handling. Start with the business event the service is responsible for completing.
For integrations and background work, identify which system owns the record and what should happen when another service is unavailable. Repeated requests must not accidentally create repeated business actions. The appropriate design depends on the event and existing system capabilities.
Test expected requests, invalid inputs and agreed failure scenarios. Document configuration, monitoring and deployment responsibilities. Hosting and ongoing support are operational tasks, so the proposal should name their owner instead of treating code delivery as the end of the system.
Free technical review
Start with a clear scope and a practical next step.
Tell us what you want to improve and share the relevant website or project details. We will review the starting point, recommend a suitable scope and provide a custom quote.
The initial review is free. Delivery, third-party charges and ongoing support are quoted separately.
Process
How the work is delivered
Review the starting point
Review the current setup, examples of the problem and the information needed to agree the work.
Agree scope and sign-off
Discovery covers existing code, users, data and external systems. We turn the main workflow into sign-off checks, then agree milestones and responsibilities.
Deliver and review
Changes are reviewed on a test environment before release. Handover includes agreed documentation, access and a maintenance route; ongoing support is separately defined.
Hand over the next steps
Review the agreed outputs together. Confirm what your team maintains and what needs a separate ongoing arrangement.
What progress should mean
Measures that match the work
Check request behaviour, processing delays, failure recovery and agreed load conditions. Document endpoints and operational responsibilities.
A record of delivery
See what was completed, reviewed and still dependent on access or approvals. Project delivery and business results are reported separately.
Clear limits in the data
We explain what can be verified and where a result is only an estimate. Contact clicks, conversations and sales are different actions.
Scope and responsibilities
You keep ownership of your business accounts and approved deliverables under the agreed contract. Any third-party licences, subscriptions or usage fees are identified before you commit.
What makes an API task ready for an estimate?
A useful brief describes the caller, data, access rules and expected side effects. Include examples and supported error behaviour. Existing code and provider documentation help assess dependencies; unknown business rules may need a discovery stage first.
Can a webhook send the same event twice?
Yes. Design for repetition and delayed delivery instead of assuming each event arrives exactly once.
What monitoring is included?
The agreed checks and logs are listed in the quote. Ongoing incident response or around-the-clock coverage is a separate commitment.
Do you document APIs?
Yes, documentation is part of delivery.
How is Node.js development priced?
We quote against your goals, current setup and agreed scope. The quote separates delivery from third-party costs and ongoing support. You receive a custom quote within 2 working days.
How long does the work take?
The timeline follows the size of the agreed scope, access, content and approvals. We confirm milestones in the quote; a simple change and a full implementation need different schedules.
How will we communicate?
Your point of contact agrees a review rhythm with you. We use email, WhatsApp and scheduled calls, with decisions and scope changes recorded clearly.
What do you need to get started?
Share your current website or system, your main goal and examples of what is not working. We then agree the access and information needed for discovery.
Is everything included in the free review?
No. The free initial review helps define the next step. Detailed research, design, implementation and ongoing support are included only when stated in your quote.
Explore the related services
Let’s agree the right next step.
Tell us your goals and current setup. We’ll recommend a practical starting point and provide a custom quote.
Custom quote within 2 working days