0:16
“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.”
API Development & Integration
API integrations that keep working when the other side is down
We build APIs and third-party integrations that survive duplicate events, rate limits, provider outages, and the edge cases absent from quick-start documentation.
Why choose us for API development and integration?
An integration is judged on the day the other side misbehaves. We build the retries, idempotency and replay tooling before the first happy-path request goes out.
Custom API development
REST and GraphQL APIs ship with explicit contracts, stable error shapes, versioning, authentication and useful documentation, so a partner integrating next year builds on the same contract the first consumer did.
Third-party integrations
Payments, banking, KYC, EHR, CRM, advertising and AI providers are wrapped behind adapters, so their quirks stay in the adapter rather than leaking through your product.
Reliable webhook systems
Signature verification, idempotency, replay, exponential backoff and dead-letter queues come as standard, so a duplicate or late event is expected behaviour rather than a data corruption incident.
API gateways + access control
Rate limits, tenant isolation, scoped credentials, usage metering and gateway policy are applied without unnecessary platform overhead, so you get the controls without another system to run.
Contract + integration testing
Consumer contracts, provider sandboxes, mock servers and failure-path tests run in CI before production, so the case the quick-start documentation left out is caught before a customer finds it.
Audit-ready data exchange
Traceable requests, redacted logs, encrypted payloads and retention controls are in place for regulated workflows, so the record an auditor asks for already exists.
What we build in API development and integration
The seams between your product and every system it has to agree with.
Payment integrations
Stripe, Plaid and banking providers, with your ledger and the provider agreeing.
- Idempotent handlers so a retry never charges twice
- Reconciliation against the provider's own records
- Refunds, disputes and payouts handled end to end
CRM and ERP sync
Two-way sync between the product and the CRM or ERP.
- Conflict rules agreed up front, per field
- A log of every record that changed and why
- Field mappings you can change without a deploy
Public APIs and developer portals
An API a partner can integrate with without opening a ticket.
- Versioned contracts with a published deprecation policy
- Scoped credentials and rate limits per client
- Reference docs, sandbox and example calls that work
Webhooks
Inbound and outbound event delivery where no event is silently lost.
- Signature verification on every inbound payload
- Backoff, retries and replay for failed deliveries
- Dead-letter queue with alerts on what stalled
Partner integrations
Data exchange with the suppliers, marketplaces and platforms your business depends on.
- An adapter you control in front of each partner
- Partner outages and rate limits handled in the adapter
- Orders, inventory and catalogue kept in step
Legacy system bridges
An adapter layer in front of the system that cannot be replaced yet.
- New products read and write through a modern interface
- Files, batch exports and polling wrapped as an API
- The old system retired later without touching the new one
Products we shipped in API development and integration
Products from our API development and integration work. Each result is the one its own case study reports, in its own words.
Non-marketers launch Meta and TikTok campaigns from one plain form, and read both platforms’ results in one view instead of two ad managers.
AI Agent for Meta and TikTok Ads
MVP · SaaS
60+ brands and 3,000+ digital products moved to their own code vault; delivery never paused.
Mana Minds
SaaS · 3rd Party Integration
9 stalled pull requests and a 3-week bug backlog cleared; 3 held features then shipped.
CheckyPro
SaaS · Custom Web App
3 data sources normalised; margin drops become tasks priced by what fixing them is worth.
Restaurant Operations Intelligence
SaaS · Data Platforms
How we build an integration
Four stages, from mapping what happens when either side is unavailable to a handoff that keeps the integration supportable after go-live.
Map contracts + failure modes
We document data ownership, provider limits, authentication, error semantics, and what must happen when either side is unavailable.
Design the boundary
OpenAPI or GraphQL contracts, internal adapters, idempotency keys, queues, and observability are agreed before implementation.
Build against reality
We use real provider sandboxes, recorded edge cases, contract tests, and fault injection: not happy-path mocks alone.
Launch + operate
Dashboards, alerts, replay tooling, runbooks, and ownership handoff make the integration supportable after go-live.
- See our full process
What clients say after the build
Real client reviews, every one checkable at source.
AI Change Management 
0:10“I find him very nice to work with and he actually delivers a very good quality. So I am really happy with him.”
Restaurants Insightful 0:09“The confidence that you're building with me the full product is what I want to go with.”
Self-image 0:07“You guys seem switched on and like you know what you're doing. I've got a good feeling about it.”
GoldenEye 0:05“You guys take a lot of pride and ownership in the work.”
“The team treats our roadmap like their own. Every standup felt like working with our own engineers, not an outside vendor.”
PixelFox “They shipped the production version of what our previous agency had been promising for nine months, without the weekly excuses.”
“They told us what NOT to build. That single conversation re-shaped six months of roadmap and saved us a lot of money.”
NDA - Signed “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…”
$4,000 and above · 11 monthsVerified client review
NDA - Signed “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…”
$1,500-$2,000 · 4 weeksVerified client review
NDA - Signed “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…”
$400-$600 · 3 weeksVerified client review
NDA - Signed “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 review
NDA - Signed “[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!”
Verified client review
NDA - Signed “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.…”
Verified client review
NDA - Signed “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!”
$3,000-$4,000 · 2 monthsVerified client review
NDA - Signed “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.”
Verified client review
NDA - Signed “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…”
Verified client review
NDA - Signed “[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 review
NDA - Signed “Very positive experience. [They are] diligent, hardworking, and [have] good communication skills. Highly recommended.”
Verified client review
NDA - Signed “[They were] very patient, [and] prepared to go the extra mile so I got the result I wanted. Highly recommended.”
Verified client review
NDA - Signed “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.”
Verified client review
NDA - Signed “[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 review
NDA - Signed “Extremely patient and did not stop until what I needed was delivered. Excellent partner to work with!”
Verified client review
NDA - Signed “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.”
10 daysVerified client review
NDA - Signed “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!”
Verified client review
NDA - Signed “We are very impressed with the service and the delivery and will use them again!”
Verified client review
NDA - Signed “Great work and completed exactly as requested!”
Verified client review
NDA - Signed “100% satisfied. Got more than expected.”
Verified client review
NDA - Signed “Great communication, great result.”
Verified client review
NDA - Signed “Thank you so much for such outstanding work.”
Verified client review
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.