Development

Integrations That Don't Break Quietly at 3am

APIs and connections built with retries, versioning, logging and alerting from the start — because the expensive part of an integration isn't building it, it's the six months after.

  • Versioned from day one
  • Retries and alerting built in
  • Documentation you can hand a developer
  • You own the source code

Is this you?

Four Signs Your Systems Aren't Really Connected

Integration problems rarely announce themselves. They show up as reconciliation work and mistrusted numbers.

  • The same data gets entered in three places

    Orders, contacts or stock keyed into separate systems by hand, disagreeing by the end of the month.

  • An integration broke and nobody noticed for a week

    No logging, no alerting, no retry — just a silent gap in the data that someone eventually finds.

  • You need to expose your data to partners or a mobile app

    Other people's software needs to reach yours, and right now there's no safe way to let it.

  • A legacy system holds data nothing else can reach

    It works, it can't be replaced yet, and everything modern has to talk to it somehow.

Overview

Connections Built to Be Maintained

The design choices that decide whether an integration survives its first breaking change.

Almost anyone can make two systems exchange data once. The difference between an integration that lasts and one that becomes a monthly incident is what gets designed around it: how failures retry, how partial data is handled, what happens when the other side changes without warning, and whether anyone finds out before your customers do.

We build APIs and integrations with that lifespan in mind. Contracts are versioned so consumers aren't broken by improvements. Rate limits, authentication and pagination are decided at design time rather than discovered under load. Every outbound call assumes the other end will eventually be slow, unavailable or wrong, and behaves accordingly — idempotent writes, queued retries with backoff, dead-letter handling for the cases that need a human.

And because integrations live in the space between teams, we treat documentation and observability as deliverables. You get an OpenAPI or GraphQL schema a developer can work from without meetings, structured logs that show exactly which payload failed, and alerting that tells you a sync has stopped rather than leaving you to infer it from a discrepancy three weeks later.

Capabilities

What's Included

Nine areas of API and integration work. Discovery decides which of them your situation needs.

  • REST API Development

    Versioned, well-documented REST APIs with consistent resource design, sane pagination and error responses a consuming developer can act on.

  • GraphQL API Development

    Schema-first GraphQL with resolver-level performance controls and query depth limits, for clients that need to ask for exactly what they use.

  • Third-Party Integration

    Payment processors, CRMs, ERPs, shipping, accounting and marketing platforms connected properly — including the parts their documentation leaves out.

  • Middleware & Integration Layers

    A connective layer that maps and transforms data between systems, so adding the next one doesn't mean another point-to-point script.

  • Webhooks & Event Delivery

    Signed, retried, idempotent event delivery in both directions, with replay for the times a consumer was down when it mattered.

  • Legacy System Connectors

    Modern interfaces in front of ageing systems — SOAP, flat files, scheduled exports, direct database reads — without touching what can't be touched.

  • Authentication & Access Control

    OAuth 2.0, API keys, JWT and scoped permissions, with rate limiting and quota enforcement so one consumer can't take the service down.

  • Data Sync & Migration

    Scheduled or real-time synchronisation with conflict rules, field mapping and reconciliation reporting you can actually verify against.

  • Monitoring & Documentation

    OpenAPI or GraphQL schemas, developer portals, structured logging, uptime checks and alerting on failed syncs rather than silent gaps.

Deliverables

What You Receive

  • Live APIs and integrations deployed to your infrastructure
  • Complete source code and repository access — you own everything we write
  • OpenAPI or GraphQL schema plus a browsable developer reference
  • Field mapping and data transformation documentation
  • Authentication credentials, scopes and rate limits configured and documented
  • Automated test suite including integration and contract tests
  • Monitoring dashboards and alerting on sync failures
  • 30 days of post-launch support included

Stack

Technologies We Use

Chosen for what your systems already speak and what your team can maintain after we leave.

API Layer

  • Node.js
  • Python
  • GraphQL
  • Express.js
  • FastAPI

Messaging & Jobs

  • Redis
  • RabbitMQ
  • AWS SQS
  • Webhooks

Platforms We Connect

  • Stripe
  • Salesforce
  • HubSpot
  • Xero
  • Shopify
  • Microsoft Dynamics

Spec & Monitoring

  • OpenAPI
  • Postman
  • OpenTelemetry
  • Sentry

Our Process

How We Build an Integration

Six phases. Most of the risk is removed in the first two, before anything is written.

  • 01

    Systems Audit & Data Mapping

    We inventory every system involved, what each one holds, which is authoritative for which field, and where the current process leaks accuracy.

    Deliverables: Systems inventory, field mapping, source-of-truth decisions

    1 week
  • 02

    Contract & Architecture Design

    Endpoints, schemas, authentication, versioning, rate limits and failure behaviour agreed and written down before implementation — the contract is the expensive part to change.

    Deliverables: API specification, integration architecture, error and retry strategy

    1–2 weeks
  • 03

    Build & Contract Testing

    Endpoints and connectors built in sprints, with contract and integration tests running against sandboxes so breakage is caught by the suite rather than in production.

    Deliverables: Working endpoints each sprint, test suite, sandbox environment

    3–8 weeks
  • 04

    Failure Handling & Hardening

    Retries with backoff, idempotency, dead-letter queues, timeout tuning and load testing — deliberately breaking the connection to see what it does when the other side misbehaves.

    Deliverables: Resilience test results, load test report, alerting rules

    1–2 weeks
  • 05

    Deployment & Cutover

    Staged rollout with the manual process running alongside until the data reconciles, then documentation and a walkthrough for whoever will own it.

    Deliverables: Production deployment, reconciliation report, developer documentation

    1 week
  • 06

    Monitoring & Iteration

    Uptime and sync monitoring, response to third-party API changes and deprecations, and new endpoints as the systems either side of the integration evolve.

    Deliverables: Monitoring reports, deprecation updates, roadmap recommendations

    Ongoing

Engagement

How We Work Together

Three shapes, depending on how many systems are involved and who owns them afterwards.

  • A defined set of endpoints or integrations, agreed timeline, fixed price. Best when the systems and the data flows are already understood.

Fit

Who This Is For

And, just as usefully, who it isn't for.

Ideal for

  • Businesses rekeying the same data between two or more systems
  • Companies whose existing integrations fail silently and get found late
  • Teams that need to expose data to partners, clients or a mobile app
  • Organisations carrying a legacy system that everything else must reach
  • Products adding payments, shipping, accounting or CRM connections
  • SaaS platforms that need a public API their customers can build on

Not the right fit if

  • The underlying system itself is the problem — start with Custom Software Development rather than wiring around it
  • You need the product the API would serve, not just the API — see Web Application Development
  • A ready-made connector already exists between your two platforms and does the job — we'll tell you when that's the case

Why DM Solutions

What You Get Beyond the Endpoints

Four commitments aimed at the months after the integration goes live.

  • Designed to Fail Safely

    Retries with backoff, idempotent writes and dead-letter queues are standard. Every integration assumes the other side will eventually be down, slow or wrong.

  • Versioned From Day One

    Contracts are versioned before you have a second consumer, so improving the API later never means breaking whatever is already depending on it.

  • You'll Know Before Your Customers Do

    Structured logging, uptime checks and alerting on failed syncs — so a broken connection is a notification, not a discrepancy someone finds next month.

  • Documentation a Developer Can Use

    An OpenAPI or GraphQL schema, real examples and field mappings. Your next developer should be able to consume this without booking time with us.

Proof of work

Integrations Still Running Quietly

Connections that removed manual reconciliation and stayed removed.

Testimonials

What Clients Say About Working With Us

  • The team truly understood our mission and brought it to life online. The website not only reflects our values but has helped us connect with our community in ways we couldn't have imagined.

    New Wine Church

  • DM Solutions understood that our website needed to be as strategic as our consulting work. The results have been remarkable — more leads, better engagement, and a digital presence that truly represents our firm.

    George

    Managing Partner, The Caylor Group

  • DM Solutions transformed our digital presence. The new site captures the essence of Tea with George perfectly while giving our listeners a seamless, engaging experience. The Webflow build and the UI/UX thinking behind it were both first-rate.

    George

    Founder, Tea with George

  • DM Solutions helped us tell our story in a way that truly moves people to action. The new website has been transformative for our fundraising and volunteer recruitment efforts.

    Director

    A Child's Wish Foundation

  • DM Solutions understood our vision and translated it into a digital platform that truly serves our community.

    Haniel Singh

    Founder, Haniel Singh Ministries

  • DM Solutions transformed our digital presence. The new site captures the essence of Tea with George perfectly while giving our listeners a seamless, engaging experience. The Webflow build and the UI/UX thinking behind it were both first-rate.

    Marcus Bell

    CEO/Founder, Tea with George

Questions

Frequently Asked Questions

The six that come up before every integration project.

  • REST is the right default for most systems: simpler to cache, simpler to debug, and every developer already knows it. GraphQL earns its place when you have many different clients needing different shapes of the same data, or mobile apps where over-fetching costs real bandwidth. We decide on your consumers, not on fashion, and we're comfortable running both where it makes sense.

Ready to Stop Rekeying the Same Data?

Tell us which systems need to talk and what keeps going wrong. We'll map it and come back with an approach and a fixed-price proposal.

Detailed proposal within 48 hours. No commitment required.