We design, build, and maintain high-performance APIs — REST and GraphQL — for web and mobile apps, integrations, and internal systems. Secure, documented, and production-ready.
ZTABS API Development: We design, build, and maintain high-performance APIs — REST and GraphQL — for web and mobile apps, integrations, and int 300+ clients, 500+ projects. Houston, TX.
ZTABS provides API development — We design, build, and maintain high-performance APIs — REST and GraphQL — for web and mobile apps, integrations, and internal systems. Secure, documented, and production-ready. Our capabilities include rest & GraphQL APIs, authentication & authorization, documentation & sdks, and more.
200+ production REST and GraphQL APIs live — every API ships with OpenAPI spec, rate limiting, auth (OAuth2/JWT), and versioning; average partner integration time cut from weeks to under 3 days.
APIs are the backbone of modern software — they connect your web app to your mobile app, your frontend to your database, and your systems to third-party services. ZTABS designs and builds production-grade REST and GraphQL APIs that are fast, secure, and easy for developers to consume. We follow API-first design: before writing code, we define endpoints, data models, authentication flows, and error handling in OpenAPI (Swagger) or GraphQL schema-first specs.
This lets your frontend team, mobile team, and third-party integrators work in parallel. Our APIs are built with Node.js (Express, Fastify, or NestJS), Python (FastAPI, Django REST), or Go depending on your performance requirements. We implement OAuth 2.0, API key management, rate limiting, request validation, and comprehensive logging as standard.
Every API ships with auto-generated documentation, Postman collections, and SDK examples. For teams moving from REST to GraphQL, we offer incremental migration strategies that let both co-exist. We also build webhook systems, event-driven architectures, and real-time APIs using WebSockets or Server-Sent Events.
API projects typically range from $15K for straightforward CRUD APIs to $80K+ for complex microservice architectures, with initial versions delivered in 4-8 weeks.
Core capabilities we deliver as part of our API development.
REST and GraphQL APIs designed for clarity, performance, and developer experience.
JWT, OAuth2, API keys, and role-based access control for secure access.
OpenAPI specs, interactive docs, and client SDKs so consumers can integrate quickly.
Rate limits, versioning, and deprecation strategies for stable, scalable APIs.
Connect with Stripe, Twilio, SendGrid, and custom systems via unified API layers.
Our team picks the right tools for each project — not trends.
Node.js empowers businesses to build scalable applications with unparalleled speed and efficiency. By leveraging its non-blocking architecture, organizations can deliver seamless user experiences and accelerate time-to-market, driving innovation and growth.
GraphQL is a query language for APIs that enables clients to request exactly the data they need. Schema-first development, flexible data fetching, and strong typing reduce over-fetching and improve developer experience.
TypeScript is a typed superset of JavaScript that adds static type checking and enhanced tooling. Catch errors at compile time, improve code maintainability, and accelerate development with world-class IDE support.
Leverage the power of Python to streamline operations, reduce costs, and drive innovation. Our Python solutions enable businesses to enhance productivity and deliver results faster than ever.
Docker empowers businesses to streamline their development and deployment processes, enhancing agility and reducing time-to-market. By leveraging container technology, organizations can achieve significant cost savings and improved operational efficiency.
Every API development project follows a proven delivery process with clear milestones.
Define endpoints, data models, auth flows, and versioning in alignment with your products and consumers.
Implement APIs with robust validation, error handling, and security best practices.
Unit, integration, and load tests to ensure reliability and performance.
Create OpenAPI specs, interactive docs, and sample code for developers.
Deploy to cloud infrastructure with logging, monitoring, and alerting.
What sets us apart for API development.
We design APIs as first-class products — consistent, well-documented, and built for long-term use.
APIs optimized for low latency, high throughput, and horizontal scaling.
Authentication, authorization, rate limiting, and input validation built in from day one.
Clear documentation, consistent responses, and helpful error messages for fast integration.
Projects typically start from $10,000 for MVPs and range to $250,000+ for enterprise platforms. Every engagement begins with a free consultation to scope your requirements and provide a detailed estimate.
Across our portfolio, we track delivery patterns to improve outcomes. Our internal data from 2023-2026 shows:
| Alternative | Best For | Cost Signal | Biggest Gotcha |
|---|---|---|---|
| Managed API platform (Hasura, Supabase, PostgREST) | CRUD-heavy APIs over Postgres where most endpoints are filtered reads and simple writes. | Hasura Cloud $0–$100/month base + usage; Supabase $25–$599/month (indicative). | Business logic (webhooks, multi-table transactions, tenant rate limiting) pushes you into Actions or Edge Functions, which are harder to test than a Node.js service. Vendor lock-in is real — Hasura metadata doesn't port to PostgREST. |
| Upwork / Fiverr freelancer | A single endpoint, a webhook receiver, or a one-off data-sync script under $3K. | $20–$75/hour; typical micro-API project $500–$5K (indicative). | No schema versioning, no rate limiting, no auth hardening. Most 'finished' APIs we inherit have secrets in git, no input validation, and raw SQL string concatenation injection surfaces. |
| Boutique agency (ZTABS tier) | Production APIs backing a SaaS product, mobile app, or partner ecosystem with SLA commitments. | $90–$180/hour; $20K–$100K per engagement (indicative). | We insist on OpenAPI/GraphQL schema-first + contract tests + structured logging. Adds ~15% to build time but halves year-1 support load. |
| Big 4 / enterprise SI (MuleSoft, Apigee, Kong) | Fortune 500 API gateways with compliance, governance, and enterprise-wide service catalog overlays. | $220–$400/hour; $400K–$5M engagements (indicative). | MuleSoft/Apigee licenses alone run $150K–$1M/year. Most mid-market teams get 90% of the value from open-source Kong + a custom Node.js service for a tenth of TCO. |
| In-house backend engineer | Sustained API evolution with 40+ endpoints in active development and a tech lead already on staff. | $160K–$240K/year loaded (US senior); $70K–$130K LatAm/EU (indicative). | Solo backend devs ship an API surface only they understand. Without code review + schema governance, the API becomes a 'never refactor, always add' graveyard by year 2. |
Custom API vs. Hasura/Supabase. Hasura Cloud Pro at $100/month + usage scales cheaply for read-heavy CRUD. A custom Node.js + Fastify API on Fly.io or Railway runs ~$50–$200/month infra. Hasura wins for pure CRUD weeks 1–8; custom wins past ~20 endpoints with non-trivial logic because Actions + Event Triggers become a distributed codebase you can't locally test. Crossover: month 4–6 of product complexity OR when your API needs stateful workflows (multi-step payments, retries, distributed locks). Agency vs. freelancer for REST API. A 15-endpoint authenticated REST API with OpenAPI docs, rate limiting, and tests: freelancer at $80/hour × 120 hours = $9.6K, OR agency at $140/hour × 80 hours = $11.2K. The 17% agency premium buys code review, structured logging, CI/CD, and project management — saves ~40 hours of your time. Break-even on time alone: anyone billing >$28/hour internally. REST + GraphQL gateway vs. pure REST. Apollo Server or GraphQL Yoga on top of REST services adds 3–6 engineer-weeks ($18K–$36K) and ~20% more infra. Worth it when: (a) you have >3 client platforms (web, iOS, Android, partners) with different field needs, (b) you want typed client SDKs auto-generated, or (c) under-fetching over REST is hurting mobile battery. Below 2 clients: skip GraphQL, save the $30K.
A single noisy tenant on a shared API hit a global Redis-backed rate limiter; the limiter key was per-endpoint not per-tenant, so OTHER tenants started getting 429s. Fix: key rate limits by tenant_id:endpoint AND api_key:endpoint, plus a separate global abuse limiter at 10× the per-tenant ceiling. Monitor limiter rejection rates per tenant in Grafana.
An 'includes' parameter on /orders?include=line_items,customer did a per-order lookup — 100 orders = 201 queries. At peak load the Postgres replica hit 98% CPU. Fix: use dataloader pattern (batch within a request tick) or SELECT... IN (...) with explicit joins. Validate via pg_stat_statements that no endpoint runs >3 queries per request.
A client's webhook receiver treated each delivery as new; Stripe retried a payment_intent.succeeded 4 times during a brief network blip and downstream systems were hit 4×. Fix: always key operations on event.id in an idempotency table with 30-day TTL. Return the previous 200 response for re-deliveries instead of re-processing.
Mobile client had two concurrent requests when access token expired; both tried refreshing, second refresh invalidated the first's new token, user booted to login. Fix: single-flight refresh in the client (a Promise concurrent callers await), OR server-side rotation with a 30s grace window. Solves ~90% of 'users randomly logged out' tickets.
A team hand-edited OpenAPI yaml to match the code — but the actual handler returned an extra optional field. Client SDKs typed it as never; mobile crashed on iOS. Fix: generate OpenAPI FROM code (Zod-to-OpenAPI, Fastify type provider, TypeBox) so drift is impossible. Add a CI check that regenerates and diffs on every PR.
Verified reviews from real client engagements — sourced from our public testimonial archive and Clutch profile.
My experience is throughout positive. Communication, service, the short response times and the flawless execution of a challenging topic was absolutely great. ZTABS is definitely my first choice again.
Christian Neff
Bank Software Advisory · Bank Software Advisory
Fintech
Fantastic Agency! I couldn't fault them even if I tried. They always go above and beyond to meet your expectations and always produces quality work. Thank you ZTABS.
Stephanie Kal
CEO · Beauty Finder Australia
Marketplace
It has been great working with ZTABS. They bounce off the ideas along the way. Amazing Experience.
Joel Rowe
CEO · Drill Quoter
Marketplace
We don't just contract — we ship and operate our own software. 17 products in production.
Find answers to common questions about our API development.
REST suits straightforward CRUD and resource-heavy apps. GraphQL excels when clients need flexible queries, reduced over-fetching, and a strong type system. We help you choose and can support both.
We build production-grade AI systems — from machine learning models and LLM integrations to autonomous agents and intelligent automation. 17 production SaaS products shipped, 300+ clients served.
We build modern web applications using Next.js, React, and Node.js — from marketing sites and dashboards to full-stack SaaS platforms. Every project ships with responsive design, SEO optimization, and performance scores above 90 on Core Web Vitals.
We build native iOS, Android, and cross-platform mobile apps using Swift, Kotlin, React Native, and Flutter. From consumer apps with social features to enterprise tools with offline sync — we deliver polished, high-performance applications from concept to App Store and Play Store.
End-to-end SaaS development from MVP to scale — multi-tenancy, Stripe billing, role-based access, and cloud-native architecture. We have built and shipped 17 SaaS products of our own, serving 50,000+ users. Next.js, Node.js, PostgreSQL, AWS and Vercel.
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