Systems integration & APIs
Your ERP, CRM, and accounting tools finally share one version of the truth.
We connect the systems your business already runs on: ERP, CRM, HR, accounting, shop, and the legacy tool nobody dares to touch. Custom APIs, webhooks, and ETL pipelines move the data; integration tests and monitoring keep it correct. One accountable delivery lead owns scope and QA gates; senior engineers in the UAE and Pakistan with Berlin-led delivery build and verify every interface.
Systems integration & APIs
What we deliver
Concrete deliverables, clearly scoped. You know before we start what you will have at the end.
ERP, CRM & accounting connectors
We integrate systems like DATEV, Salesforce- or HubSpot-class CRMs, HR platforms, and shop systems with your other tools. Customer and invoice records stay consistent across all of them.
Custom APIs & webhooks
When a vendor API is missing or too limited, we build the missing piece: documented REST or GraphQL endpoints, webhook receivers, and the authentication around them.
ETL & data pipelines
Python-based pipelines extract, transform, and load data between databases and SaaS tools on a schedule or in real time. Failures retry and report; they do not corrupt.
Legacy bridges
For systems without APIs we build controlled bridges: file-based exchange, database views, or screen-level automation as a last resort, each with monitoring and a documented exit path.
Why our approach works
Integration is tested like code
Every interface gets automated tests with real edge cases: duplicates, missing fields, timeouts, out-of-order events. We break it in staging so production stays boring.
Idempotent by design
Our sync jobs can run twice without creating duplicates. This sounds obvious; missing idempotency is a failure mode we plan for in every integration we take over.
Monitoring before go-live
Dashboards and alerts ship with the interface, not after the first incident. You see sync lag and failure rates before your accountant does.
Documented for the next team
Every integration comes with a data-flow diagram, field mappings, and runbooks. If you later move development in-house or to a BOT transfer, nothing lives only in our heads.
Process
How we work
Step 1: System & data inventory
We list every system, its data ownership, API quality, and update frequency. The output is an integration map that shows where data is created and where it is still typed by hand.
Step 2: Interface design
For each connection we define direction, field mapping, conflict rules, and failure behavior in writing. You approve the contract before we build it.
Step 3: Build & staged testing
Engineers build against sandbox or staging systems first. Real data follows only after the test suite passes, including the ugly cases from step two.
Step 4: Go-live & observation
Cutover happens in a defined window with a rollback plan. For the first weeks we watch the metrics together, then hand over monitoring and runbooks to your team.
How an engagement runs
- Per-connection fixed quotes inside a roadmap
- The inventory produces a roadmap; each connection gets its own fixed estimate. Work bills at the blended senior rate of $25–49 per hour against that estimate.
- Two-system connection in 3–8 weeks (planning assumption)
- A clean, well-documented API on both sides sits at the lower end. Legacy bridges and poor vendor documentation push it up.
- One accountable delivery lead plus two to four integration engineers
- The lead owns the interface contracts and stakeholder sign-off. Senior engineers in the UAE and Pakistan build and test against sandbox systems before real data flows.
Tooling
Technology stack
- Data movement & events
- Webhooksmessage queuesscheduled sync jobsevent streams
- APIs & pipelines
- REST
GraphQLPython ETL
Apache Airflow - Systems we connect
- DATEV
Salesforce
HubSpot
StripeSAP-class ERPs - Cloud & operations
AWSAzure
GCP
DockerGrafanaSentry
What you walk away with
Documented interface contracts
Direction, field mappings, conflict rules, and failure behavior for every connection, approved by you before the build.
Tested, monitored integrations
Each connection ships with automated tests, dashboards, and alerts. Sync lag and failure rates are visible to you, not just to us.
Data-flow diagrams & runbooks
Where data is created, where it is copied, and what to do when a sync breaks. Written for the team that inherits operations.
Repository & credential handover
All code in your Git organization, credentials in your vault, and a recorded handover session.
Is this the right service?
Worth it if...
- Month-end closing takes days because numbers are copied between accounting, CRM, and spreadsheets.
- You bought good tools that each work alone, and the gaps between them are staffed with people.
- A vendor API is missing or limited and you need a controlled bridge with monitoring.
Not worth it if...
- The real problem is that one system should replace three others. That is a selection and migration project; we will say so and scope it differently.
- You want a real-time sync where a nightly batch would do. We will argue for the boring option when it is cheaper and safer.
- Data ownership between departments is unresolved. No interface contract survives a political fight over who owns the customer record.
For QuickBilling we built the invoicing product's REST API with webhooks, a sandbox environment, and idempotent request handling, so external systems can integrate against it safely.
Read the case studyBuilt for the German business environment
International companies running software and AI in Germany need more than engineering capacity. They need a partner who works the way German teams, procurement, and data protection officers expect.
German-speaking delivery lead
One accountable lead runs decisions, written updates, and handover in German or English. Your team in Germany is never the last to get context.
DSGVO and GDPR by design
Data-minimising architectures, EU hosting options, processing records, and DPAs (AVV) prepared together with your data protection officer.
German contracts and invoicing
EUR quotes, phased statements of work, German jurisdiction, and documentation that stands up to procurement and internal audit.
Integrates with German systems
We connect DATEV, SAP, Microsoft 365, Personio, Shopware, and your existing ERP or CRM instead of asking you to replace them.
CET/CEST and US overlap
Daily overlap with German business hours, plus enough shared time for US stakeholders so both sides keep moving.
EU AI Act readiness
Human review, audit trails, and model documentation for the AI systems we build, aligned with how German auditors expect AI to be governed.
Get in touch
Make your systems talk
Tell us which two systems should share data and currently do not. We will map the connection and estimate it.
Berlin leads, three hubs deliver
German-led delivery across Berlin, the UAE, and Pakistan — we diagnose your problem first, then build a tailored solution.
EU & US timezone overlap
Daily overlap with teams in Germany and the US — synchronous when it matters.
From MVP to scale-up
One partner across AI, web, mobile, and UX — through every stage of your product.
Email us
admin@solutionplus.io
Response time
Within one business day
Clear & direct
You're not the first to ask, and we're ready.
Our ERP has no modern API. Can you still integrate it?
Usually yes. We work with file exports, database access, or vendor-specific interfaces like DATEV formats, and wrap them in a monitored bridge. We will tell you honestly when a system is so closed that integration costs more than replacing it.
How do you keep data consistent between systems?
Each connection has one defined master per data object and written conflict rules; the sync jobs are idempotent. Reconciliation reports compare both sides on a schedule, so drift is detected instead of discovered by a customer.
Who owns the integrations after the project?
You do. Code, credentials handling, documentation, and monitoring live in your accounts and repositories. A common path: our team runs operations at first, and you later transfer everything through our BOT model.
What does an integration project typically cost?
Work is billed at our blended senior rate of $25–49 per hour. A single two-system connection is often a matter of weeks; a broader integration program is scoped as a roadmap with per-connection estimates. Planning figures only: the inventory in step one produces the real numbers.