Connected product engineering

API Integration

We build APIs and third-party integrations that survive duplicate events, rate limits, provider outages, and the edge cases absent from quick-start documentation.

Partnerships and reviews

Certified partnerships

  • Microsoft Partner
  • Google Partner
  • Meta Business Partner
  • Shopify Partners
  • Oracle Partner
  • AWS Partner

Rated by clients and team

  • Clutch
  • Google
  • Indeed

What you get

Integration engineering that fails safely

The contract, retry path, audit trail, test suite, and runbook are part of the deliverable: not follow-up work after the first incident.

Custom API development

REST and GraphQL APIs with explicit contracts, stable error shapes, versioning, authentication, and useful documentation.

Third-party integrations

Payments, banking, KYC, EHR, CRM, advertising, and AI providers: wrapped so their quirks do not leak through your product.

Reliable webhook systems

Signature verification, idempotency, replay, exponential backoff, and dead-letter queues as standard.

API gateways + access control

Rate limits, tenant isolation, scoped credentials, usage metering, and gateway policy without unnecessary platform overhead.

Contract + integration testing

Consumer contracts, provider sandboxes, mock servers, and failure-path tests that run in CI before production.

Integration rescue + migration

Replace brittle direct calls and silent failures without stopping the product or losing in-flight events.

Audit-ready data exchange

Traceable requests, redacted logs, encrypted payloads, and retention controls for regulated workflows.

Modern office workspace

Integrations that survive the edge cases absent from quick-start docs.

Delivery

How we build dependable integrations

  1. 01

    Map contracts + failure modes

    We document data ownership, provider limits, authentication, error semantics, and what must happen when either side is unavailable.

  2. 02

    Design the boundary

    OpenAPI or GraphQL contracts, internal adapters, idempotency keys, queues, and observability are agreed before implementation.

  3. 03

    Build against reality

    We use real provider sandboxes, recorded edge cases, contract tests, and fault injection: not happy-path mocks alone.

  4. 04

    Launch + operate

    Dashboards, alerts, replay tooling, runbooks, and ownership handoff make the integration supportable after go-live.

Failure-proof engineering

We engineer around provider reality, not documentation

Every integration we ship includes signature verification, idempotency, replay, exponential backoff, dead-letter queues, and operational dashboards. When a provider goes down, your product degrades gracefully: it does not break.

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Fit

When specialist integration work pays off

Best for

  • A core product flow depends on an external provider
  • Retries or duplicate events could corrupt money, identity, or clinical data
  • Your integration works in a demo but fails under production volume
  • You need a stable API contract for internal or partner teams

Not for

  • A one-off Zapier workflow with no custom product logic
  • A provider with no usable API, export, or authorised access path
  • A request to bypass provider controls, consent, or platform terms

Testimonials

What founders say after the build

Verbatim quotes from teams we shipped to production. We publish testimonials with written sign-off on file.

  • Recorded client call

    I find him very nice to work with and he actually delivers a very good quality. So I am really happy with him.

    Noa van der Veen · Strategy and operations, CheckyPro

  • Recorded client call

    I very much respect the knowledge that you have. You have a lot of things, just in our few communications, that no one else has mentioned. No one else has even made me think about them.

    Mirinda Scott · Founder, AI Change Mangement

  • SkinOS / 2250.care
    The team treats our roadmap like their own. Every standup felt like working with our own engineers, not an outside vendor.

    SkinOS team

    Clinical product, SkinOS / 2250.care

  • Recorded client call

    You're doing very, very well... the confidence that you're building with me — the full product is what I want to go with.

    Evan Kerivan · Founder & CEO, Restaurants Insightful

  • CheckyPro
    They told us what NOT to build. That single conversation re-shaped six months of roadmap and saved us a lot of money.

    CheckyPro team

    Operations, CheckyPro

  • Recorded client call

    You guys seem switched on and like you know what you're doing. I've got a good feeling about it.

    Dan Cameron · Founder, Self-image

  • Recorded client call

    You guys take a lot of pride and ownership in the work.

    Hamza Tariq · Co-Founder, GoldenEye

  • PixelFox
    They shipped the production version of what our previous agency had been promising for nine months, without the weekly excuses.

    PixelFox team

    Founders, PixelFox

  • Recorded client call

    I find him very nice to work with and he actually delivers a very good quality. So I am really happy with him.

    Noa van der Veen · Strategy and operations, CheckyPro

  • I had a large project built that needed a very specific understanding and the project was executed perfectly. Great design, great code, no bugs and anything I needed was done incredibly professionally. I would highly recommend and I will definitely be coming back with my…

    Verified client

    Israel

    $4,000+ · 11 monthsVerified client review

  • We approached several sellers in our search to get an app developed for our Shopify store. I had a very clear idea in my mind what we wanted and, through [their] expert questioning, [they] absolutely 'got it'. This was further proved through delivery of a…

    Verified client

    United Kingdom

    $1,500–$2,000 · 4 weeksVerified client review

  • We're working on a Shopify app that retrieves book data from our API and helps online stores and booksellers create book listings faster. This time, we needed to improve the app design and fix functionality issues. In general, we're satisfied with the service and plan…
    Barbara Hartman

    Barbara Hartman

    Repeat client · United States

    $400–$600 · 3 weeksVerified client review

  • This was a special request where we needed to rush this development. [They] complied and finished everything at the agreed time, and even worked until 2AM [their] local time in order to finish this on time. [They] went the extra mile for us with this…

    Verified client

    Canada

    Verified client review

  • [They were] very patient as we figured out exactly what we needed our app to do. [They were] able to get all the functionality we required, communicated well, and [were] upfront about the cost. We'll definitely be coming back for future projects!

    Ben McLellan

    Canada

    Verified client review

  • Absolutely fantastic work. This was a tricky app, and [they] did great work. [They] really know [their] way around Shopify and the process for developing a Shopify app, which was a great help to me! [They're] motivated and committed, and delivered a very high-quality app.…
    Lisa Zigel

    Lisa Zigel

    Israel

    Verified client review

  • I am very pleased to have worked with [them]! [They were] very detailed and delivered me perfection in an app! I look forward to working with [them] again!
    Verified client

    Verified client

    United States

    $3,000–$4,000 · 2 monthsVerified client review

  • Amazing service. Amazing time. Took all input and made the site great even with minor changes along the way. Will certainly try to use again if I'm lucky enough to have [them] work with me again. Thank you for everything.
    Gabriel Muller

    Gabriel Muller

    United States

    Verified client review

  • Very fast and thorough. [They] did exactly what I asked and then went the extra mile to tie up a couple of loose ends. I'm really pleased with the speed and efficiency, and would certainly recommend [them]. Thank you for your help and highly professional…
    Danny Venn

    Danny Venn

    Cambodia

    Verified client review

  • [They understand] the problem so well and deliver the results super quick. I'll not hesitate to say that I've found a gem. One thousand percent recommended!
    Verified client

    Verified client

    Pakistan

    Verified client review

  • Very positive experience. [They are] diligent, hardworking, and [have] good communication skills. Highly recommended.
    Max Hawthorne

    Max Hawthorne

    United States

    Verified client review

  • [They were] very patient, [and] prepared to go the extra mile so I got the result I wanted. Highly recommended.

    Carey Heazlewood

    Australia

    Verified client review

  • The project was not easy, literally. [They] did hard work on our project and finished as expected. Would like to work on upcoming new features together. Thank you.

    Erica Yagelsk

    United States

    Verified client review

  • [They are] reasonable, meticulous, [have] a great sense of design, and [are] very responsive. I really enjoyed working with [them] and [they] delivered a beautiful website for me.

    Verified client

    United States

    Verified client review

  • Extremely patient and did not stop until what I needed was delivered. Excellent partner to work with!
    R. Mendoza

    R. Mendoza

    United States

    Verified client review

  • I didn't expect such great service from someone I found without a referral. I got lucky and I hope to work with [them] again in the future.

    Verified client

    United States

    $1,500–$2,000 · 10 daysVerified client review

  • Bought this to create a website for my startup company. Results were above and beyond what I was expecting! Quick to answer, and always gave great input and ideas!

    J. Leonard

    United States

    Verified client review

  • We are very impressed with the service and the delivery and will use them again!
    Alexander Ekdahl

    Alexander Ekdahl

    Sweden

    Verified client review

4.6/5across 58 verified client reviews.Read them all at source

API integration questions

What matters is not whether the happy path works. It is what the product does when the provider behaves unexpectedly.

  • Our production work includes Stripe, Plaid, Onfido, Apple HealthKit, EHR systems, OpenAI, Anthropic, Meta Marketing API, Google Ads API, CRMs, and other vertical providers. The important capability is not memorising SDKs; it is engineering around provider-specific limits and failure behaviour.

Building an integration users will depend on?

Talk to the engineers who will design the contract, failure paths, tests, and operational handoff: not a sales engineer.