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CIEL

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Building Battle-Tested APIs & Integrations That Scale to 10M+ Requests Daily

Ciel Technology engineers high-performance REST/GraphQL APIs and complex system integrations that connect your stack seamlessly—achieving 99.99% uptime and sub-50ms response times under peak loads. Our API architects design enterprise-grade interfaces integrating CRMs, ERPs, payment gateways, and custom data pipelines for fintech, e-commerce, and SaaS platforms processing billions in transactions annually. We don't just build endpoints—we create integration platforms that unlock your data's full potential.

Let’s connect and launch your next mobile success story.

Our Proven Impact Over the Years

Our API team has built 200+ integration platforms handling 5B+ API calls monthly across enterprise ecosystems.

10+ years

API architecture expertise

200+

Integration platforms delivered

5B+

Monthly API requests served

30+

Enterprise systems connected

Choosing the Right API Partner Prevents Integration Hell

Partner with Ciel Technology for APIs that scale from startup MVP to Fortune 500 without rewrite.

Why CTOs Choose Ciel APIs

Ex-Stripe & Twilio API Architects

Senior API engineers from companies processing $1T+ in payments and communications.

Zero-Downtime Schema Evolution

GraphQL federation and REST versioning preventing breaking changes at 10M+ user scale.

Observability-First Design

OpenTelemetry tracing, 100% request logging, automated SLA monitoring from day one.

Our API & Integration Services

Ciel Technology delivers complete API platforms from design to 99.99% SLA production systems.

REST & GraphQL API Development

High-performance APIs with OpenAPI 3.1 specs, auto-generated SDKs, and developer portals.
Capabilities include:

  • 50ms p99 latency at 10K req/sec
  • JSON:API and OpenAPI 3.1 compliance
  • Automatic SDK generation (20+ languages)
  • Rate limiting, quota management, webhooks
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Enterprise System Integrations

Seamless connectivity between CRMs, ERPs, payment processors, and custom data warehouses.
What we offer:

  • Salesforce, HubSpot, Dynamics 365 (full API coverage)
  • SAP, Oracle NetSuite, Workday ERP integration
  • Stripe, PayPal, Adyen payment orchestration
  • Real-time bidirectional sync with conflict resolution
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Event-Driven Microservices

Async event platforms with Kafka, RabbitMQ, and AWS SNS/SQS for decoupled architectures.
Our services:

  • Schema registry (Avro, Protobuf, JSON Schema)
  • Event sourcing and CQRS patterns
  • Saga orchestration and distributed transactions
  • Dead letter queue processing and retry logic
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B2B API Platforms & Marketplaces

White-label API products with developer portals, usage analytics, and revenue sharing.
Expertise includes:

  • Stripe Connect-style platform accounts
  • Twilio-style sub-accounts and API keys
  • Usage-based billing and metered APIs
  • Developer onboarding and documentation portals
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Technology Stack at Ciel API Development

Production infrastructure for every integration scenario and scale requirement.

API Frameworks

FastAPI

Express.js

Spring Boot 3

ASP.NET Core

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API Gateways

Kong

AWS API Gateway

Azure APIM

GraphQL

Apollo Server/Federation

Hasura

GraphQL Yoga

Event Streaming

Kafka 3.7

RabbitMQ

AWS SNS/SQS

Documentation

OpenAPI 3.1

Swagger UI

Redoc

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Why Enterprises Trust Ciel APIs

99.99% uptime SLA with auto-failover
Sub-50ms p99 latency at peak load
Zero breaking changes with semantic versioning
5-year backward compatibility guarantee

Trusted by Enterprises Worldwide

Ciel APIs power fintech platforms, e-commerce marketplaces, and enterprise SaaS globally.

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Our API Development Process

01

API Design First

 OpenAPI contracts, domain modeling, security workshop, performance profiling.

02

Implementation

Parallel frontend/backend development, automated schema validation, integration testing.

03

Developer Experience

Auto-generated SDKs, interactive docs, Postman collections, sandbox environments.

04

Production Hardening

Load testing (100K req/sec), security penetration testing, observability setup.

05

Platform Launch

Developer portal, usage analytics, SLA monitoring, 24/7 on-call support.

Connect With Our API Architects

Schedule an API strategy session with our Head of Platform Engineering.

Learn more

Selected API & Integration Projects

🏦 Prominence Bank – Multi-Fintech API Platform

Industry: FinTech/Banking
 Integrations: 20+ APIs (Stripe, Plaid, blockchain oracles, KYC providers, crypto exchanges)
 Complete banking API platform powering account creation, document verification, fiat/crypto transactions, investments. Unified API facade across 12 backend systems with 99.98% uptime.
 🔗 Live Platform

💳 Cash App Clone – Complete Fintech Backend

Industry: Digital Banking
 Integrations: Plaid, Stripe, Circle (USDC), Persona KYC, AWS Lambda
 Full banking API suite with accounts, transfers, cards, crypto, compliance. Real-time transaction streaming via Kafka. 5M+ simulated transactions stress tested.
 🔗 Cash App

⭐ Altio Tech – Wealth Management APIs

Industry: Fintech/Asset Management
Integrations: Bloomberg, Alpha Vantage, Yahoo Finance, TradingView, CRM sync
Investment platform APIs connecting market data feeds, portfolio analytics, risk modeling, client reporting. WebSocket real-time pricing for 10K+ instruments.
🔗 Platform

🥗 Crumb – Health Fintech Integrations

Industry: Health/Fintech
 Integrations: Apple Health, Google Fit, Stripe, Firebase Auth, business CRM APIs
 Reward platform connecting fitness data → business discounts → payment processing. Complex event orchestration across 8 partner APIs with real-time user rewards calculation.
 🔗 App Store

🌐 Mooner – Multi-Service Marketplace APIs

 Industry: Gig Economy
 Integrations: Google Maps, Twilio SMS, Stripe Connect, crypto payments, blockchain oracles
 Complete marketplace API platform with provider matching, payments, reviews, notifications. Multi-tenant architecture supporting 50+ service categories.
 🔗 Live Platform

What You Can Expect to Achieve

10M+ req/day Scale

Horizontal autoscaling with zero-downtime deployments and blue-green rollouts.

Sub-50ms Latency

CDN edge caching, GraphQL data loader batching, connection pooling optimization.

Zero Breaking Changes

Contract testing, semantic versioning, API gateway proxy patterns, rollback safety.

Developer Velocity

Auto-generated SDKs, interactive docs, sandbox environments, webhook validation.

What Our CTOs Say

Ciel unified 17 legacy APIs into one clean facade—our frontend team shipped 3x faster. Their marketplace APIs handle Black Friday peaks without breaking a sweat.

Frequently Asked Questions – API Development

REST vs GraphQL—which delivers ROI?

GraphQL for complex UIs/client apps, REST for public APIs/B2B, gRPC for microservices.

Multi-region active-active, circuit breakers, 100+ health checks/sec, auto-failover <30s.

Both. OpenAPI for public REST APIs, GraphQL SDL for internal/client apps, contract-first always.

 API gateway facade + event sourcing + strangler pattern. 6-month typical migration.

Redis-backed distributed rate limiting, tenant quotas, spike arrest, adaptive throttling.

OAuth 2.1, OpenID Connect, JWT, mTLS, API keys, custom claims, zero-trust by default.

Event-driven webhooks with idempotency keys, dead letter queues, retry backoff. Always async-first.

 Database-level row isolation, schema-per-tenant, dedicated infra for enterprise clients.

OpenTelemetry traces, 100% request logging, custom Grafana dashboards, PagerDuty alerts.

Stoplight/Backstage portals, auto-SDK generation, usage analytics, interactive API playgrounds.

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