Integrations that actually stay up
US-based engineers integrating web applications with Salesforce, NetSuite, Stripe, HubSpot, and the industry APIs your business runs on.
What this service delivers
Integration is where most software projects quietly fail. Two systems each work fine in isolation, but the connection between them is brittle, poorly monitored, and understood by one engineer who left last year. Multiply by ten integrations and you have a business risk.
NextGen builds integrations as first-class engineering work: idempotent, retriable, observable, and testable against sandboxes. We integrate web applications with the CRM, ERP, billing, communication, and industry-specific systems your business depends on.
Every integration ships with retry policies, dead-letter queues, contract tests against vendor sandboxes, and dashboards you can look at when something goes wrong.
Why choose NextGen Coding
Most integration failures come from ignoring the boring parts: idempotency keys, retry backoff, DLQs, and the specific failure modes of each vendor. NextGen treats those as the primary work, not an afterthought.
We have deep experience with the systems most B2B businesses actually run on: Salesforce, NetSuite, HubSpot, Stripe, Twilio, Segment, Shopify, and the long tail of industry APIs.
Built for teams that need to move
CRM and marketing sync
Companies syncing lead, contact, and account data between web apps and Salesforce or HubSpot.
ERP integration
Products connecting to NetSuite, SAP, Microsoft Dynamics, or industry-specific ERPs.
Payment and billing
Companies wiring Stripe, Chargebee, or Recurly into web apps with correct revenue accounting.
E-commerce middleware
Retailers coordinating Shopify, WMS, 3PL, ERP, and marketing systems.
Communications
Products integrating Twilio, SendGrid, Slack, Zoom, or industry-specific messaging APIs.
Industry APIs
Regulated-industry products integrating with government, banking, insurance, and healthcare APIs.
Everything included in a NextGen build
Integration architecture
Data flow diagrams, source-of-truth decisions, and reconciliation strategy documented before code.
Idempotent handlers
Every write operation designed to be safely retried, with idempotency keys on the wire.
Retry and backoff
Exponential backoff, jitter, and per-vendor rate-limit handling built into every client.
Dead-letter queues
Failed messages routed to a DLQ with a defined replay workflow.
Webhook receivers
Signed webhook validation, replay protection, and idempotent processing.
Contract tests
Tests against vendor sandboxes running in CI to catch API changes before they hit production.
Reconciliation jobs
Scheduled jobs that reconcile source and destination to catch silent drift.
Observability
Per-integration dashboards for volume, error rate, and end-to-end latency.
Runbooks
Written playbooks for the top failure modes of each integration.
Sandbox and staging
Full sandbox environment with test data for every integration.
How the engagement runs
Integration discovery
Vendor documentation review, sandbox access, and data flow architecture.
Contract and schema
Data contracts and schemas defined for every message in and out of the integration.
Build
Integration built with idempotency, retry, and DLQ from the first commit.
Observability
Dashboards and alerts added alongside every integration.
Fault injection
Simulated vendor outages and rate-limit responses to validate resilience.
Reconciliation
Scheduled reconciliation jobs plus quarterly integration review.
Transparent, US-market pricing
Single integration
One vendor integration end-to-end with retry, DLQ, and observability. Starting $12,000.
Integration platform
Middleware layer serving multiple integrations with shared retry, auth, and observability. Starting $45,000.
Integration retainer
Monthly retainer covering monitoring, incident response, and iteration on existing integrations.
All pricing is transparent and US-market calibrated. We don't compete on the lowest upfront number — we compete on delivering outcomes that generate the highest return on investment.
Results our clients experience
Zero missed webhooks
A B2B SaaS client processed 2.4M Stripe webhooks over 12 months with zero missed events after we rebuilt their webhook receiver.
CRM sync accuracy 99.6%
A revenue team's Salesforce sync accuracy rose from 82% to 99.6% after we introduced idempotency and reconciliation.
Vendor migration in 4 weeks
An integration platform we built let a client swap payment vendors in 4 weeks — a project that would have taken 6+ months on their previous point-to-point setup.
Thought leadership & technical writing
Integration as engineering work
Why idempotency, retry, and DLQs are the actual work of integration.
Webhook receivers that survive
Signing, replay protection, and idempotent processing patterns.
Reconciliation without pain
Scheduled jobs that catch silent drift before it becomes a customer-facing problem.
Objections, addressed
Can't we use Zapier or Make?+
For low-volume, low-stakes integrations, yes — and we'll recommend it if that's the right fit. For high-volume, revenue-critical, or compliance-sensitive integrations, purpose-built code pays back through reliability, observability, and cost.
How do we prevent breaking changes from vendors?+
Contract tests against vendor sandboxes running in CI, plus a subscription to vendor changelog RSS or webhook so we hear about deprecations.
What happens when an integration goes down?+
Alerts fire, DLQ absorbs failed messages, and a documented runbook covers the top failure modes. Nothing is lost; nothing gets retried unsafely.
Frequently asked questions
Which vendor systems do you have depth in?+
Salesforce, HubSpot, NetSuite, Stripe, Twilio, Segment, Shopify, and Zendesk are common. Long tail: government APIs, banking APIs, insurance APIs, healthcare APIs, and industry-specific systems.
Can you integrate with our legacy on-prem system?+
Yes. SOAP, XML-RPC, flat-file drops, and SFTP-based integrations are all supported. We wrap them in a modern interface for the rest of your stack.
Do you handle iPaaS platforms like MuleSoft or Boomi?+
Yes. We can build within an existing iPaaS or replace it with purpose-built code when total cost of ownership favors doing so.
How do you handle credentials?+
AWS Secrets Manager, HashiCorp Vault, or Doppler — never in code. Rotation is scheduled and audited.
Engineering discipline. US-based delivery.
NextGen Coding Company builds websites and software as measurable business assets, not decorative art. Our team combines rigorous engineering discipline with design and conversion strategy, and every deliverable is accountable to an outcome. Clients partner with a single US-based team that owns strategy, design, build, and post-launch iteration.
All work is performed by US-based engineers and designers. Our team's proximity to US business hours, cultural context, and buyer expectations produces web experiences that resonate with domestic audiences — a nuance offshore teams frequently miss. We serve clients from New York and across the country, from early-stage startups through Fortune 500 enterprises.
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