Spreadsheet middleware
Staff export CSVs nightly to keep CRM and finance aligned. We replace that with API-driven sync, field maps, and reconciliation dashboards.
Software Engineering
Connect your systems without the glue work
API integrations, third-party connectors, webhooks, and payment/CRM/ERP glue — so your stack exchanges data reliably instead of through spreadsheets and copy-paste.
APIs
Connected
SaaS, banks, telcos, internal
Sync
Bidirectional
With conflict handling
Hooks
Event-driven
Signed, retried, audited
Maps
Data contracts
Clear field-level schemas
Integration that holds under real traffic
Most businesses run a patchwork of SaaS tools, payment rails, ERPs, and legacy databases that were never designed to talk to each other. LesterTechLabs builds production system integrations — REST and GraphQL connectors, webhook receivers, M-Pesa and bank bridges, CRM/ERP sync, and scheduled data pipelines — with idempotency, rate-limit awareness, and monitoring so failures surface before customers do.
Source systems
Payments, CRM, ERP, e-commerce, SMS, and internal APIs
Integration layer
Auth, mapping, transforms, retries, and dead-letter queues
Sync & events
Webhooks, polling jobs, and near-real-time bidirectional sync
Observability
Delivery logs, reconciliation reports, and failure alerts
POST /v1/webhooks/mpesa/c2b
202 Accepted · synced
{{ body|default:"{
\"status\": \"success\",
\"data\": { ... }
}" }}Challenges we solve
Integration failures we see when tools are bolted together without contracts — and how we engineer durable connections.
One-way, fire-and-forget webhooks
Callbacks arrive twice, out of order, or not at all. We build signed, idempotent handlers with retries and dead-letter recovery.
Payment and ERP drift
M-Pesa settles but invoices stay open. We bridge payment gateways to accounting systems with matching rules and exception queues.
Vendor APIs that change without notice
SaaS schema changes break silent jobs. We version mappings, contract-test critical paths, and alert on unexpected response shapes.
What we deliver
Core capabilities included in every integration services engagement.
API & SaaS connectors
Custom adapters for CRM, ERP, e-commerce, and internal services.
Webhook & event bridges
Signed receivers, retries, DLQs, and fan-out to downstream systems.
Payment & banking glue
M-Pesa, Paystack, Flutterwave, and bank APIs wired into your stack.
CRM / ERP data sync
Bidirectional sync with field maps, conflict rules, and audit trails.
Scheduled data pipelines
Batch ETL for reports, warehouses, and overnight reconciliation.
Integration runbooks
Docs, monitoring, and handoff so your team can operate the mesh.
Where this fits
Common scenarios we deliver this service for, in any country.
Payment → finance reconciliation
M-Pesa and card settlements posted to Odoo, QuickBooks, or custom ERPs.
CRM ↔ product sync
Leads, accounts, and subscription status stay consistent across tools.
E-commerce & inventory bridges
Orders, stock, and fulfillment events shared between storefront and WMS.
Partner & B2B API onboarding
Scoped keys, sandboxes, and mapping layers for ISV or bank partners.
Key benefits
- One source of truth instead of conflicting exports and manual merges
- Idempotent payment and webhook handling that survives retries and outages
- Field-level contracts so schema changes don't silently corrupt data
- Visibility into every sync run — success rates, lag, and failed records
- Designed for payment rails, latency, and intermittent connectivity
Why LesterTechLabs
-
Contract First
Field maps and event schemas before code — fewer surprises later.
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Idempotent by Design
Safe retries for payments, webhooks, and batch sync jobs.
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Operable Mesh
Logs, alerts, and runbooks so integrations don't become tribal knowledge.
Our process
A proven delivery framework from kickoff to production.
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01
System inventory
Map sources, sinks, auth models, volumes, and failure modes.
-
02
Contract design
Field maps, event schemas, SLAs, and conflict-resolution rules.
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03
Build & harden
Connectors, webhooks, retries, tests, and staging end-to-end runs.
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04
Go-live & operate
Cutover, reconciliation reports, alerts, and optional managed support.
Technologies we use
Modern, battle-tested stacks for production workloads.
Related services
Other software engineering offerings you may need.
Frequently asked questions
Common questions about integration services.
How is this different from API development?
API development builds your public or product APIs. Integration connects existing systems — third-party SaaS, payments, CRM/ERP, and partners — so data flows correctly without rebuilding those platforms.
How is this different from automation?
Integration focuses on durable system-to-system data exchange and contracts. Automation focuses on replacing repetitive human workflows with scheduled jobs and bots. Many projects use both — we scope them clearly up front.
Can you integrate M-Pesa, banks, and accounting tools?
Yes. We routinely connect M-Pesa STK/C2B/B2C, Paystack, Flutterwave, and bank APIs to ERPs and finance systems — including webhook verification, reconciliation, and exception handling.
Do you support iPaaS tools like Zapier or n8n?
When the volume and logic are light, yes. For mission-critical payment, ERP, or high-volume sync we prefer custom connectors with tests, observability, and ownership — sometimes alongside a lightweight orchestration layer.
How long does a typical integration take?
A focused two-system connector (auth + mapping + webhooks) often ships in 2–4 weeks. Multi-system meshes with reconciliation and partner onboarding run 6–12 weeks depending on vendor APIs and data quality.
Software Engineering
Ready to connect your stack?Integration Services?
List the systems that should share data — we'll propose an integration approach and timeline within 48 hours.
- Free estimate · reply in 1 business day
- Production delivery · remote-first
- M-Pesa, cloud, and AI ready
Next step
Start your project
- 1 Tell us about your goals
- 2 Get a tailored proposal
- 3 Ship with LesterTechLabs