What types of APIs do you integrate?

REST (the most common), GraphQL, SOAP (legacy), webhooks, WebSockets, EDI (retail/supply chain), and custom protocols. We also bridge systems without APIs using RPA or scraping as a last resort.

How much does an API integration project cost?

Simple integrations (2 systems, standard auth): $5k–$15k. Mid-complexity (3–5 systems, OAuth, data transformation): $15k–$40k. Enterprise (custom middleware, compliance, high-volume): $40k–$100k+.

Do you handle rate limits, retries, and error recovery?

Always. Every integration ships with retry logic (exponential backoff), rate-limit handling, dead-letter queues for failed messages, idempotency guarantees, and alerting via Slack/email on failures.

Can you integrate with legacy systems without APIs?

Yes. We bridge via direct database connections (when safe), file-based imports (SFTP/CSV), screen scraping with Playwright, or RPA when no other option exists. We document all trade-offs upfront.

How long does a typical integration take?

1 week for simple Zapier/Make-level connections. 4–8 weeks for production-grade integrations with error handling, monitoring, and tests. 3–6 months for enterprise middleware covering 10+ systems.

Do you provide ongoing maintenance?

Yes — optional retainer ($1,700–4,800/mo) covers monitoring, vendor API updates, new endpoints, and incident response. APIs break constantly; you need someone on call.

Services

API Integration Services That Never Silently Break

500+ integrations shipped. We connect your CRM, ERP, payment gateway, email, Slack, databases, custom APIs, and legacy systems — all talking to each other reliably, with retries, monitoring, and alerts baked in.

Investment

USD $5k – $100k+

Timeline

1–16 weeks

Team

6 seniors

Projects

350+

The problem

Manual processes are a hidden tax on your business

Every modern business runs on 50+ SaaS tools and internal systems that should talk to each other — but usually do not. The cost of not integrating them: duplicate data entry, stale reports, broken customer journeys, compliance gaps, lost deals. Most companies estimate they lose 10–20% of team productivity to tool switching and manual data shuffling.

We do API integration the right way. Not "drag-and-drop on Zapier and hope it works" — real integrations with proper authentication, rate-limit handling, idempotency, retries, dead-letter queues, monitoring, and documentation. 500+ production integrations. Zero silent failures.

What you get

Everything built to production standards

Every major protocol

REST, GraphQL, SOAP, webhooks, WebSockets, EDI, SFTP. We handle whatever your vendors ship.

Production-grade reliability

Retries, idempotency, rate limiting, dead-letter queues, circuit breakers. Battle-tested patterns.

Data transformation

Mapping, normalization, enrichment, validation — whatever shape your systems need.

Custom middleware when needed

When off-the-shelf iPaaS hits limits, we build tailored middleware in Node.js or Python.

Versioning and migrations

API v1 → v2 migrations without downtime. Backward-compatible rollouts.

Observability built-in

Every call logged. Latency and error metrics. Alerts to Slack when SLAs break.

Our process

From audit to production in 4 steps

Discovery audit

60–90 min structured session. We map every step of your current process and quantify hidden costs.

Architecture design

We pick the right stack (n8n, Make, custom) and document the full automation blueprint. You approve before we build.

Build & test

Weekly demos. 50+ real-world test cases. Error handling, retries, and monitoring baked in from day one.

Deploy & optimize

Live monitoring, team training, 30 days of post-launch support. Retainer optional for ongoing optimization.

Real use cases

Proven automations with real numbers

Stripe ↔ QuickBooks Sync

Automatic transaction sync from Stripe to QuickBooks with proper tax coding, refund handling, and multi-currency support. Eliminates 15 hours/week of manual reconciliation.

Shopify ↔ ERP Multi-Channel

Real-time order and inventory sync between Shopify, Amazon, MercadoLibre, and SAP/Odoo ERP. Handles split orders, returns, and price updates.

HubSpot ↔ Salesforce Migration

Bi-directional CRM sync with conflict resolution, custom field mapping, and historical data migration. Used during M&A platform consolidations.

Twilio SMS/Voice Orchestration

Custom middleware orchestrating SMS, voice, and WhatsApp across Twilio, MessageBird, and Retell AI for multi-channel customer engagement.

Bank API Integrations

Direct integrations with Plaid, Mercury, Mercadopago, and MODO APIs for financial reconciliation, automated payments, and fraud detection.

Legacy ERP Bridge

REST wrapper around SOAP-based SAP/AS400 systems so modern tools (Slack bots, mobile apps, analytics) can consume legacy data safely.

Tech stack

The right tool for every job

We are tool-agnostic. Open source when possible, commercial when it makes sense. You own the code and the credentials, always.

n8nMakeZapierPythonNode.jsSupabasePostgreSQLAWSOpenAIClaudeReactPlaywright

Full scope

Everything included in your engagement

No hidden costs, no surprise invoices, no change orders for things already promised. Everything below ships in every project.

Fixed scope, fixed price

30 days post-launch support

Full IP transfer on delivery

Integration audit and architecture doc
Authentication setup (OAuth 2.0, JWT, API keys, SAML)
Data mapping and transformation logic
Webhook receivers with idempotency
Rate limit handling and adaptive throttling
Retry logic with exponential backoff
Dead-letter queue for failed messages
Monitoring dashboard (latency, errors, throughput)
Slack/email alerting on failures
Complete technical documentation
Load testing with realistic volumes
30 days post-launch support

Book a free 60-minute automation audit

We review one of your processes, identify hidden costs, and give concrete recommendations — no commitment, no sales pitch.

Social proof

What clients say

"Julián's team automated our entire client onboarding. We went from 3 days of manual work to 2 hours. ROI in 4 months, and we sleep better at night."

Sarah K.

COO, B2B SaaS

"I hired 4 different agencies before finding Julián. They shipped in 6 weeks what the others had been selling us for 9 months. No juniors, no BS."

Michael T.

CEO, Fintech

"We replaced Salesforce with a custom automation platform for 1/10th the cost. Their team knows what they're doing and it shows."

Laura M.

Head of Ops, E-commerce

FAQ

Frequently asked questions

Something else on your mind? Book a 60-min audit and we'll answer anything.

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