Projects / Business Development / API Engineering
Engineering Service

API Engineering.
The connective tissue your stack is missing.

The integrations between the systems you already run. Internal APIs that scale. Third-party connectors that don't break at 2am. Twenty-two shipped, all observable, all in production.

99.997%
12-month uptime
14ms
p50 latency
22
Integrations shipped
$148
Avg daily LLM saving
— 01

What it does.

SH

Commerce

Shopify, Amazon, WooCommerce, Magento, BigCommerce. Plus repricing, inventory and order sync.

FN

Finance & accounting

Xero, QuickBooks, Sage, FreeAgent, Stripe. Reconciliation engines that survive month-end.

SH

Shipping & fulfilment

Royal Mail, DPD, ParcelForce, FedEx, UPS. Label printing, tracking, exception flow.

INT

Internal API design

Versioning, auth, rate-limits, eventing. APIs your platform team doesn't dread.

AI

AI routing layer

Cost-routed prompts across providers. Eval-gated outputs. Fallback when models fail.

OB

Observability built-in

OpenTelemetry tracing, SLO budgets, alerting. You see what we see.

— 02

How it works.

01 / SCOPE

Map the contracts

What endpoints, what events, what auth model. Costed, dated, signed before code ships.

02 / BUILD

Production from day one

No "demo APIs". Built with retries, idempotency, observability — the unglamorous bits done right.

03 / EVAL

Test against reality

We replay your real traffic in staging. Conflicts and edge cases surface before launch.

04 / OPERATE

SLA-backed support

On-call, paged, with runbooks. Stays with you for 12 months, or transfers to your team.

— 03

See it in production.

The connective tissue your stack is missing.

The integrations between the systems you already run. Internal APIs that scale. Third-party connectors that don't break at 2am. Twenty-two shipped, all observable, all in production.

Request a walkthrough
api.unknwn.dev · gateway
99.997% uptime · 14ms p50 · 0 alerts
POST /v1/shopify/orders → 201 12ms
GET /v1/xero/invoices → 200 8ms
POST /v1/royalmail/labels → 201 22ms
SUB webhook:order.created → fanout 4
POST /v1/stripe/charges → 200 19ms
GET /v1/woocommerce/sync → 200 14ms
[reconcile] 14 events · 0 conflicts
[ai-router] cost-routed 3,210 · saved $148
— 04

Who it's for.

Retail platforms

Multi-channel sync

One source of truth across Shopify + Amazon + EDI partners — without manual reconciliation.

Commerce
SaaS founders

Internal API layer

Lay the foundation right before you scale the team. Documented, versioned, owned by you.

Foundation
AI products

Cost-routed LLMs

Route prompts by cost / latency / capability. Eval gates before deploys. Switch providers in minutes.

LLM-ops
— 05

Built on / integrates with.

S
Shopify
X
Xero
RM
Royal Mail
WC
WooCommerce
S
Stripe
EDI
EDI
S
Sage
QB
QuickBooks
DPD
DPD
PF
ParcelForce
K
Klaviyo
A
Amazon
BC
BigCommerce
OT
OpenTelemetry
PSQ
PostgreSQL
S
Shopify
X
Xero
RM
Royal Mail
WC
WooCommerce
S
Stripe
EDI
EDI
S
Sage
QB
QuickBooks
DPD
DPD
PF
ParcelForce
K
Klaviyo
A
Amazon
BC
BigCommerce
OT
OpenTelemetry
PSQ
PostgreSQL
Get in touch

Let's talk about your business development workflow.

Tell us what you're trying to do. We'll respond within one business day.