Article
REST vs GraphQL
A practical decision framework — when each protocol earns its keep.
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API Integration & System Integration
Connect Everything.
Automate Everything.
We build secure, scalable API ecosystems that seamlessly connect your software, cloud services, enterprise systems and third-party platforms — engineered for millions of events per day, audited for compliance, and owned entirely by you.
500M+
Events / month
99.99%
Integration uptime
<100ms
P95 latency
Stripe
Salesforce
AWS
SAP
Slack
Shopify
ALL SYSTEMS OPERATIONAL
api.evsora.io · v4.2
REQ/SEC
0
P95 LATENCY
0ms
UPTIME
0.00%
event stream
POST /v1/charges → 200 42ms
WEBHOOK invoice.paid ✓
SYNC salesforce.account#a4z ✓
GET /v2/customers → 200 31ms
EVENT order.created → 6 consumers
RETRY hubspot.contact ✓
Why API Integration
The cost of disconnected systems is silent and enormous.
Fortune 500 ops teams report 22% of working hours lost to reconciling data between systems that should already agree. Integration removes the tax.
Without integration
Swivel-chair operations
Manual processes
Duplicate data
Human errors
Disconnected systems
Slow operations
Stale reporting
With EVSORA
Connected, automated, intelligent
Real-time sync
Process automation
Unified data fabric
Scalable workflows
Business intelligence
Audit-ready trails
Integration Services
End-to-end integration engineering services.
One team for the full integration lifecycle — design, build, secure, observe, evolve.
Service
REST API Development
Typed, versioned REST APIs with OpenAPI 3.1, pagination, idempotency, ETags and SDKs in 5 languages.
GET/v1/customers200
POST/v1/orders201
PATCH/v1/invoices/{id}200
DELETE/v1/keys/{id}204
Service
GraphQL APIs
Federated GraphQL with persisted queries, dataloader batching and field-level auth.
query {
customer(id: "c1") {
name email orders { total }
}
}
Service
SOAP Integrations
Tame legacy SOAP / WSDL endpoints behind clean modern facades.
<soap:Envelope>
<GetOrder id="42"/>
</soap:Envelope>
Service
Webhook Development
Signed, retried, deduped webhooks with replay tooling.
invoice.paid
order.shipped
user.created
Service
Middleware Development
Custom orchestration layers when iPaaS isn't enough.
IN
→TX
→VALIDATE
→ROUTE
→OUT
Service
Enterprise Integrations
SAP, Oracle, Workday, NetSuite, Dynamics — handled.
Service
Cloud Integrations
AWS, Azure, GCP — multi-account, multi-region, IaC-managed.
Service
Payment Integrations
Stripe, Adyen, PayPal, regional rails — PCI-scoped.
Service
CRM Integrations
Salesforce, HubSpot, Dynamics — bi-directional sync with golden records.
Service
ERP Integrations
NetSuite, SAP, Odoo, Dynamics 365 — orders, inventory, finance.
Inventorysync ✓
Orderssync ✓
Service
Authentication APIs
OAuth 2.0, OIDC, SAML, passkeys, SSO — multi-tenant ready.
OAuth 2.0
SAML
SSO
Service
Data Migration
Zero-downtime cutovers with shadow reads and reconciliation.
migrated 4.2M / 5.1M rows
Service
Microservices
Domain-driven service decomposition with contracts and SLOs.
auth
billing
orders
ship
inv
users
search
ai
Service
Third-Party APIs
Any vendor API, wrapped, monitored and rate-aware.
Service
Custom Connectors
First-class connectors for your iPaaS or marketplace.
App A
—Connector
—App B
Service
SDK Development
Type-safe SDKs in TS, Python, Go, Java, Ruby — generated from spec.
const ev = new Evsora(key);
await ev.orders.create(o);
Service
Legacy System Integration
Mainframe, AS/400, on-prem databases — modernized safely.
AS/400↔REST
Service
IoT Integration
MQTT, AMQP, LoRaWAN ingestion at scale.
Service
AI API Integration
OpenAI, Anthropic, Gemini, Bedrock — with cost & safety controls.
Service
API Modernization
Replace fragile XML APIs with versioned REST / GraphQL.
v1 XMLv3 REST
Systems We Integrate
The systems your business already runs on.
Every card below maps a swivel-chair workflow to its connected equivalent — the before and after of integration.
CRM
Sales reps copy-pasting between spreadsheets and Salesforce.
Every lead, call and email lands in CRM in real time.
ERP
Inventory drift, manual GL postings, end-of-month chaos.
Orders, invoices, stock and GL reconciled by event.
Accounting
Bookkeepers re-typing invoices from 3 systems.
QuickBooks / Xero auto-fed and reconciled nightly.
HRMS
Onboarding tickets, missed deprovisioning.
Workday → Okta → AD → laptop in 20 minutes.
POS
Store-by-store CSV exports.
Lightspeed / Square streamed live to BI.
Inventory
Overselling on marketplaces.
Single SKU truth across web, retail, wholesale.
Payment Gateways
Manual settlement reconciliation.
Stripe / Adyen reconciled to GL automatically.
Government Systems
Quarterly manual filings.
Auto-filed e-invoicing & tax APIs.
Logistics Platforms
Shipping label tabs across 6 carriers.
Unified rates, labels, tracking via one API.
Marketing Platforms
Stale audiences, missed campaigns.
Customer events → HubSpot / Mailchimp live.
Communication Platforms
Slack pings copied to Jira manually.
Slack ↔ Jira ↔ Linear ↔ PagerDuty unified.
Analytics Tools
Conflicting dashboards.
Single event spec piped to BI, warehouse, product analytics.
Integration Architecture
An enterprise architecture diagram you can show your CTO.
Defense-in-depth, observable at every layer, deployed to multiple regions with active-active failover.
Web
React, Next.js, edge SSR
L1
Mobile
iOS, Android, Flutter, RN
L2
API Gateway
Kong · APIM · Apigee
L3
Authentication
OAuth · OIDC · SAML · mTLS
L4
Business Logic
Domain services · sagas
L5
Microservices
Containerized · contract-tested
L6
Cloud
AWS · Azure · GCP · multi-region
L7
Third-Party APIs
Stripe · Salesforce · SAP · 200+
L8
Database
Postgres · Mongo · DynamoDB · Redis
L9
Analytics
Snowflake · BigQuery · Looker
L10
Monitoring
Datadog · Grafana · PagerDuty
L11
API Types
One protocol per job — chosen for fitness, not fashion.
We pick REST, GraphQL, gRPC, SOAP, webhooks, WebSockets, event streaming or queues based on latency, throughput, contract strictness and team familiarity.
Protocol
REST
Universal default — public APIs, partner integrations, mobile backends.
Simple
Cacheable
Universal tooling
Integration Workflows
Real workflows, live wired.
Two examples of how an event in one system cascades through your stack — automatically, transactionally, observably.
Workflow
New customer onboarding
Customer registration
Web form / mobile app
✓
CRM
Salesforce contact + opportunity
✓
ERP
NetSuite customer record
✓
Accounting
Xero contact + tax profile
✓
Notifications
Welcome email + Slack alert
✓
Analytics
Segment event → warehouse
✓
Workflow
Payment to invoice
Payment
Customer pays via portal
✓
Gateway
Stripe / Adyen authorization
✓
Invoice
Auto-generated PDF + GL line
✓
Accounting
Reconciled to bank feed
✓
Customer portal
Receipt visible instantly
✓
Enterprise Connectors
32 official connectors — and 200+ more on tap.
Every connector ships with retries, signed webhooks, rate-limit awareness, sandbox credentials and a unified observability hook.
Stripe
PayPal
Shopify
WooCommerce
Salesforce
HubSpot
Microsoft 365
Google Workspace
QuickBooks
Xero
Slack
Zoom
Calendly
Twilio
Mailchimp
Zendesk
OpenAI
Google Maps
AWS
Azure
Google Cloud
Docker
Kubernetes
Firebase
WhatsApp
Zapier
GitHub
Notion
Jira
LinkedIn
DocuSign
Meta
200+ Ready-to-Use Integrations
Search 200+ production-tested integrations.
Filter by category, search by name. Don't see what you need? We ship custom connectors in two-week sprints.
Stripe
PayPal
Shopify
WooCommerce
Salesforce
HubSpot
Microsoft 365
Google Workspace
QuickBooks
Xero
Slack
Zoom
Calendly
Twilio
Mailchimp
Zendesk
OpenAI
Google Maps
AWS
Azure
Google Cloud
Docker
Kubernetes
Firebase
WhatsApp
Zapier
GitHub
Notion
Jira
LinkedIn
DocuSign
Meta
32 shown · 200+ in catalog
Request a custom connector API Security
Built to pass your security review.
Aligned with SOC 2 Type II, ISO 27001, PCI DSS, HIPAA and GDPR controls — and ready for your CISO's pen-test.
OAuth 2.0 / OIDC
Auth Code + PKCE, refresh rotation, scope-based access.
JWT
Short TTL, asymmetric signing, revocation lists.
SSO
SAML / OIDC enterprise SSO with JIT provisioning.
API Keys
Vaulted, rotated, scoped per consumer.
Rate Limiting
Token-bucket and sliding-window per key, IP, route.
Encryption
TLS 1.3 in transit, AES-256 at rest, field-level KMS.
Audit Logs
Immutable, queryable, exportable to SIEM.
IP Whitelisting
CIDR allowlists per partner with WAF in front.
RBAC
Role + attribute based access for every endpoint.
Zero Trust
mTLS + per-request authorization, never assume the network.
API Monitoring
Anomaly detection, abuse signals, real-time alerts.
Threat Defense
OWASP API Top 10 controls + bot management.
API Dashboard Showcase
Operate APIs with cockpit-grade observability.
Latency, errors, throughput, saturation — every dimension wired to PagerDuty, every spike traceable to a single request.
Requests / sec
4,218
P95 Latency
84ms
Error rate
0.018%
Traffic by endpoint
last 24h
POST /v1/charges92%
GET /v1/customers78%
POST /v1/webhooks64%
GET /v1/orders52%
POST /v1/oauth/token41%
Health status
api.evsora.io200
webhooks.evsora.io200
events.evsora.io200
sandbox.evsora.io200
Data Synchronization
Bi-directional sync, conflict-resolved.
Golden-record matching, deterministic merge rules and an audit log for every field — so finance, ops and product never argue about whose data is right.
System A
CRM
System B
ERP
Accounts, opportunities, orders, invoices
System A
Accounting
System B
Banking
Payments, statements, reconciliation
System A
HR
System B
Payroll
New hires, terminations, pay runs
System A
Inventory
System B
Marketplace
Stock, pricing, listings, orders
System A
Orders
System B
Warehouse
Pick, pack, ship, returns
System A
Customers
System B
Support
Identity, entitlements, history
API Development Lifecycle
A repeatable lifecycle, not heroic firefighting.
Every integration moves through the same engineered pipeline — predictable, traceable, auditable.
Phase 1
Requirements
Stakeholder interviews, current-state audit, success metrics, contracts.
Phase 2
Architecture
C4 diagrams, technology choices, data flows, SLOs and capacity plan.
Phase 3
Development
Trunk-based dev, contract-first, typed clients, infra-as-code.
Phase 4
Testing
Contract, integration, load, chaos, security — fully automated in CI.
Phase 5
Documentation
OpenAPI, AsyncAPI, dev portal, Postman, SDKs and changelogs.
Phase 6
Deployment
Blue/green, canary, feature flags, automated rollback.
Phase 7
Monitoring
SLOs, RED/USE metrics, distributed tracing, anomaly alerts.
Phase 8
Maintenance
Vendor-change watch, dependency updates, quarterly hardening.
Technology Stack
A modern, boring-where-it-matters stack.
We use proven, supported, hire-able technologies — and never lock you into a single vendor or runtime.
Backend
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Python
Go
Java
.NETFrameworks
ExpressFastAPINestJSSpringDatabases
PostgreSQL
MongoDB
RedisCloud
AWSAzureGoogle CloudDevOps
DockerKubernetesGitHub ActionsMonitoring
PrometheusGrafanaOpenTelemetryAI
OpenAIAnthropicLangChain Performance & Scalability
Engineered for millions of events per day.
The same patterns Netflix, Stripe and Shopify use — applied with discipline to your stack.
Load Balancing
Layer 4 + Layer 7, weighted, health-aware, multi-region.
Caching
Redis, CDN edges, HTTP cache headers, query-result caches.
Queues
RabbitMQ, SQS, Kafka — backpressure and replay built-in.
Horizontal Scaling
Stateless services, autoscaling groups, K8s HPA.
CDN
Cloudflare, Fastly, CloudFront — assets and API edge caching.
Database Replication
Primary-replica, read-routing, logical replication.
API Gateway
Kong, APIM, Apigee — central auth, throttle and observability.
Circuit Breakers
Resilience4j-style breakers, half-open recovery.
Retry Logic
Exponential backoff + jitter, idempotency keys.
Monitoring
Synthetic + RUM, SLO budgets, error budgets, weekly reviews.
Case Study · Helix Logistics
30 disconnected systems. One event-driven backbone.
Challenge
A North American 3PL operating 22 warehouses and 12 carrier partners ran on Salesforce, NetSuite, custom WMS, EDI X12, four carrier APIs, two TMS platforms, QuickBooks, Slack and a homegrown PHP middleware shipping nightly CSVs. Order-to-cash took 11 days. Customer escalations averaged 14 hours to resolve. The CTO had a 9-month window before a new investor-required audit.
Architecture
EVSORA designed a Kafka-backed event-driven backbone with 14 typed event topics, a Node + Go services tier behind Kong API Gateway, OAuth 2.0 across all consumers, Debezium CDC against NetSuite and WMS, mTLS to carrier partners, and a Datadog + PagerDuty observability layer with SLOs per consumer. EDI X12 was wrapped in a translation service exposing clean REST + AsyncAPI.
Systems Connected
Salesforce · NetSuite · Custom WMS · EDI X12 · FedEx · UPS · DHL · USPS · MercuryGate · Project44 · QuickBooks · Slack · PagerDuty · Snowflake · Tableau · DocuSign · Twilio · SendGrid.
11d → 38min
Order-to-cash
14h → 22min
Customer issue MTTR
$2.4M
Manual ops saved / yr
99.99%
Integration uptime
48M
Events / month
7 mo
Delivery
Technology
Business result
Audit closed with zero material findings. New customer onboarding dropped from 11 weeks to 9 days. Helix won three enterprise accounts in the following quarter — citing the integration platform in RFP wins.
Why EVSORA
An engineering partner your CTO will defend.
Enterprise Architecture
Real C4 diagrams, real capacity plans, real disaster recovery.
API-First Design
Contracts before code, generated clients, no surprises.
Scalable Integrations
Event-driven, idempotent, partitioned for growth.
Modern Cloud Stack
AWS / Azure / GCP — IaC-managed, FinOps-aware.
Security by Design
OWASP, SOC 2, ISO 27001 controls baked in.
Dedicated Engineers
Named senior engineers — not a faceless pool.
Comprehensive Documentation
OpenAPI, AsyncAPI, dev portal, runbooks.
Testing & QA
Contract, integration, load, chaos and security in CI.
Monitoring
SLOs, error budgets, on-call rotations day one.
Long-Term Support
SLA-backed support tiers, follow-the-sun available.
AI Integration
LLM-aware integrations with cost and safety controls.
Business Understanding
We translate finance, ops and product — not just code.
Resources
Field notes from the integration trenches.
Editorial deep-dives on API design, security and operations — written by the engineers who ship them.
Article
Designing Scalable APIs
Idempotency, pagination, versioning and the rest of the boring discipline.
Read article
Article
Webhook Best Practices
Signing, retries, replay, dedup — and the failure modes nobody talks about.
Read article
Article
API Security Checklist
A 32-point checklist every public API should pass before launch.
Read article
Article
Microservices vs Monolith
When the org chart, not the architecture diagram, makes the call.
Read article
Article
Building Enterprise Integrations
Notes from shipping platforms that move billions of dollars a year.
Read article
Frequently Asked Questions
Technical answers for technical buyers.
Ready when you are
Let's connect your
entire business ecosystem.
Bring us your messiest stack. We'll come back with an architecture diagram, a phased plan and a fixed-price discovery sprint inside a week.