API Development That Connects, Automates & Scales Your Systems
We engineer high-performance REST and GraphQL APIs, webhooks, and secure microservices. Eliminate manual copy-pasting, synchronize internal databases in real time, and power your web and mobile applications with sub-50ms speed.
POST /api/v1/auth/token
OAuth2 & JWT bearer validation
GET /api/v1/orders/sync
PostgreSQL connection pool active
Rate Limiter Active
Redis token bucket: 1,000 req/min
When Your APIs Are Slow or Fragile, Your Whole Business Stalls
Your frontend website and mobile apps are only as reliable as the backend architecture powering them. Poorly engineered APIs lead to dropped orders, security risks, and exhausted support teams.
Sluggish Response Latency
Endpoints that take 800ms+ to respond make your mobile apps and web checkouts feel slow, increasing bounce rates and frustrating customers during peak traffic.
Fragile Third-Party Breakages
A single unhandled webhook payload or changed field from an external service crashes your entire background sync, halting invoices and order dispatches.
Security & Rate-Limit Vulnerabilities
Unprotected endpoints without OAuth2, JWT verification, or IP throttling leave your database exposed to credential stuffing, scrapers, and malicious DDoS surges.
Zero Documentation & Guesswork
Frontend and mobile developers spend hours guessing request payloads and query parameters because existing APIs lack interactive Swagger or Postman specs.
Data Desynchronization & Overlap
Inventories, CRM contacts, and accounting records drift out of sync across departments, causing embarrassing customer discrepancies and manual spreadsheet corrections.
The Expensive No-Code Middleware Trap
Relying on Zapier or Make for core data pipes forces you into thousands of dollars in monthly task fees while suffering from artificial rate limits during your busiest hours.
See the Difference: Live API Reliability in Practice
What Is Custom API Development?
In simple terms: an API is a secure digital bridge that lets your software, databases, and third-party partners talk to each other automatically with zero human effort.
No-Code Tools & Webhooks
Third-party connectors (like Zapier, Make, or pre-made plugins) that stitch platforms together with rigid limits.
- Recurring Per-Task Tax: Fees scale rapidly as your order volume increases, often costing $500–$2,000+/month.
- Severe Rate Limits: External platforms throttle or drop your requests during flash sales and peak seasonal hours.
- Slow 1–5 Minute Delays: Data syncs on polling cycles rather than sub-second instant edge triggers.
- Zero Custom Business Rules: Impossible to implement proprietary pricing formulas or complex multi-database validation.
Custom Engineered APIs
Tailored REST or GraphQL backends engineered specifically around your database and commercial requirements.
- Sub-50ms Lightning Latency: Optimized database indexing and Redis caching deliver instant responses.
- Zero Per-Call Surcharges: Handle millions of requests every month on predictable cloud hosting without per-call penalties.
- 100% Code & Schema Ownership: All repositories, Swagger documentation, and deployment keys belong entirely to your business.
- Bank-Grade OAuth2 & RBAC: Granular permissions ensure only authorized apps and staff can read or mutate sensitive records.
The Digital Nervous System of Modern Business
When your API layer is engineered correctly, your website, mobile apps, warehouse POS, and accounting tools operate as one cohesive, error-free machine.
API Development Services Engineered for Scale
From high-throughput RESTful endpoints and real-time webhook engines to enterprise microservices, our backends power mission-critical software.
Custom REST API Architecture
Clean, predictable RESTful APIs engineered with OpenAPI 3.0 specifications, strict versioning (v1/v2), cursor-based pagination, and sub-50ms query responses.
High-Performance GraphQL APIs
Typed, federated GraphQL schemas eliminating over-fetching and under-fetching. Perfect for complex frontend dashboards, web apps, and native iOS/Android clients.
Public & Partner Developer APIs
Turn your core software into an extensible platform. We build Stripe-grade developer portals with self-serve API key management, sandbox environments, and auto-generated SDKs.
Third-Party SaaS & Payment Sync
Rock-solid integrations connecting your backend to Stripe, Salesforce, HubSpot, QuickBooks, and Twilio with zero data drift and automated conflict resolution.
Real-Time Webhook Engines
Production webhook infrastructure designed for 99.999% deliverability. Includes HMAC-SHA256 signature verification, exponential backoff retries, and Dead Letter Queues (DLQ).
Legacy Database & ERP Facades
Wrap aging SQL Server, Oracle, or on-premise mainframe databases in modern, secure REST/GraphQL wrappers without touching legacy code.
Microservices & API Gateways
Decouple monolithic backends into resilient, independent microservices coordinated by high-throughput API gateways like Kong, Envoy, or AWS API Gateway.
Event Streaming & Queue Workers
Handle asynchronous, compute-heavy tasks without degrading user-facing latency. Built with Kafka, RabbitMQ, and Redis background worker clusters.
Edge & Serverless API Optimization
Deploy lightning-fast endpoints within milliseconds of your users worldwide using Cloudflare Workers, AWS Lambda, and global Redis caches.
APIs Should Accelerate Your Bottom Line
The measure of a great API is not just code sophistication, but how reliably it automates your data, unlocks partner revenue, and scales without overhead.
Instant End-User Experiences
Optimized database indices, Redis caching, and streamlined payloads deliver sub-50ms query responses that keep client applications lightning fast.
Always-Online Business Services
Decoupled services with automatic health checks, circuit breakers, and container failover ensure your core APIs never leave users stranded.
Flawless Multi-System Data Flow
Strict idempotent request handling and database transaction isolation stop duplicate charges, missing records, and inventory drift forever.
Scale Without Engineering Panic
Stateless microservice endpoints auto-scale seamlessly during product launches, Black Friday surges, or viral marketing campaigns.
Zero Vendor Lock-In
Every line of backend code, OpenAPI specification, and database migration is stored in your private GitHub repository under your complete ownership.
Escape Escalating Middleware Bills
Replace expensive no-code connectors that charge monthly subscription tiers per task with a custom API engine hosted on your own cloud.
Engineered for Organizations Scaling Their Infrastructure
Whether you are launching your first public developer API or modernizing a mission-critical enterprise core, we design endpoints built to scale reliably.
SaaS Founders & Digital Products
Turn core logic into an extensible platform
You have a proven web product and need a world-class public API to attract integration partners, enable developer ecosystems, or launch enterprise B2B plan tiers.
E-Commerce & High-Volume Retailers
Unify stores, couriers, payments & ERPs
Your transaction volume is outgrowing basic Zapier syncs. You need sub-second webhooks connecting Shopify, ERPs, 64-district delivery couriers, and payment providers.
Enterprises Modernizing Legacy Stacks
Unlock legacy databases without risky rewrites
Your core business runs on older SQL Server, Oracle, or on-premise systems. We build high-speed REST and GraphQL microservice facades so modern apps can interact safely.
Mobile App & Multi-Platform Teams
One unified backend for iOS, Android & Web
You are building apps across iOS, Android, and web. Instead of duplicating business logic across clients, we engineer a centralized, high-throughput GraphQL/REST backend.
Not sure which API architecture fits your specific architecture?
We audit your existing databases, third-party services, and user workloads to recommend the leanest, most reliable architecture.
How We Engineer Production-Grade APIs
From first schema design to production stress testing, our 6-step roadmap ensures your APIs are fast, secure, and fully documented.
Schema & Architecture
Data Modeling & Contract Definition
We map your database entities, relations, and business logic before writing any code. We define a strict OpenAPI 3.0 specification that acts as the single source of truth.
OpenAPI 3.0 Spec & Relational Database Entity Diagram
You share your business data flows and third-party tools
Complete Deliverables: Everything You Receive
We don't just write endpoints and leave. Every Planex API engagement delivers an enterprise-grade backend asset complete with automated tests, documentation, and cloud pipelines.
OpenAPI 3.0 & Swagger Documentation
Interactive developer documentation with live endpoint testing, exact payload schemas, and auto-generated curl examples.
100% Source Code Ownership
All backend source code is delivered directly to your company's private GitHub repository from day one. You own everything.
Postman Collection & Automated Tests
Ready-to-run Postman test workspace with environment variables, auth tokens, and unit test assertions for your engineers.
Docker Containers & CI/CD Pipeline
Production Docker configurations and GitHub Actions pipelines for automated testing, linting, and zero-downtime deployment.
Database Schemas & Migrations
Clean relational schemas with foreign key integrity, index optimization, and version-controlled migration scripts.
DDoS & Rate-Limiting Configuration
Enterprise rate-limiting tiers, brute-force mitigation, and CORS security policies configured at the gateway level.
Real-Time Monitoring & Sentry Alerts
Configured telemetry dashboards tracking request latency, throughput, and automatic Slack/email alerts on any 5xx error.
30-Day Free Post-Launch Warranty
Zero-stress launch protection. If any unexpected bug or payload error occurs within 30 days of release, we fix it at zero extra charge.
When Custom APIs Make Sense (And When They Don't)
Not every business workflow requires custom backend engineering. We believe in total honesty: we will tell you upfront if a no-code connector or existing SaaS tool is better for your stage.
Your Business Depends on Low Latency, Proprietary Data & Scale
- Cross-Platform Sync: You need iOS, Android, web portals, and external partners to read and write to the same single source of truth in real time.
- Sub-50ms Response Speeds: High-traffic e-commerce checkout funnels or dynamic mobile feeds where slow third-party polling would kill user conversions.
- Cost Predictability: As transaction counts hit millions, no-code per-task billing or SaaS API plan upgrades become financially crippling.
- Proprietary IP: Your business rules, pricing algorithms, and data structures are unique commercial secrets that cannot live in third-party black-box tools.
Requirements Are Standard or Workflows Still Change Daily
- Early-Stage Discovery: You are validating whether customers even want your product. A quick no-code prototype is faster and cheaper while finding market fit.
- Low Event Frequency: You only process 20 to 50 leads a month between Google Forms and an email list. Off-the-shelf Zapier works fine.
- Standard Native Integrations: Connecting a standard Shopify storefront to standard Klaviyo email templates with zero custom pricing or warehouse rules.
- Internal Exploratory Hacks: A temporary spreadsheet sync that will be discarded next week when your operational workflow changes.
Battle-Tested Backend Technologies
You don't have to manage the technical stack. We select battle-proven, open-source technologies that guarantee high performance, security, and long-term maintainability.
High-Throughput Runtimes
Asynchronous non-blocking event loops engineered to handle tens of thousands of simultaneous socket connections without stalling.
Your API stays blisteringly fast and never freezes or crashes during major product launches or traffic spikes.
Resilient Datastores & In-Memory Cache
Strict ACID transactional integrity paired with sub-millisecond Redis RAM caching for frequently requested customer and product records.
Prevents double charges, eliminates database lockups, and slashes query response times to under 50 milliseconds.
Protocols & Typed Contracts
Strictly typed endpoint schemas that validate payloads before they hit your database and automatically generate client SDKs.
Frontend and mobile developers integrate twice as fast with zero guesswork and zero runtime schema mismatches.
Containerization & Edge Routing
Lightweight containerized microservices deployed across global edge networks with automated CI/CD unit testing and deployment gates.
Zero-downtime updates, effortless server migration, and defense against global DDoS threats.
Enterprise Security & Scalability Standards
Production APIs power the nervous system of your business. We engineer every route with strict defensive security so your endpoints stay fast and impenetrable.
OAuth2 & Granular RBAC
Stateless JSON Web Tokens (JWT) and scoped API keys ensure every endpoint verifies who is making the call and whether they have exact permissions.
DDoS & Rate-Limit Defense
Token-bucket and sliding-window rate limiters prevent API key brute-forcing, scraping bots, and abusive requests from overwhelming your database.
TLS 1.3 & At-Rest Encryption
All traffic encrypted over modern TLS 1.3 in transit. Sensitive fields, payment tokens, and customer credentials are encrypted with AES-256 at rest.
Automated Failover & Backups
Containerized microservice instances behind load balancers with automated health checks, daily off-site database snapshots, and instant failover.
Real Backends Powering Real Scale
We don't deal in hypothetical concepts. Here is how our custom APIs eliminated sync errors, absorbed traffic surges, and automated mission-critical workflows.
Preparation Academy
Sub-50ms live exam submission API & automated evaluation queue
Previous platform crashed during peak admission mock tests. Thousands of simultaneous answer submissions caused HTTP 504 gateway timeouts and lost test results.
Architected an event-driven REST API with Redis queue buffering, atomic answer submissions, sub-50ms timer synchronization, and real-time KaTeX math resolution.
Exchanger
Real-time trade-in valuation engine & multi-branch POS sync
Staff managed trade-in valuations, repair tickets, and branch inventory on disjointed systems. Slow manual syncs resulted in double-sold gadgets and cash imbalances.
Engineered a unified API gateway with idempotent webhooks, instant bKash/Nagad digital payment reconciliation, and automated POS branch inventory synchronization.
Preview Publication
Automated courier dispatch & 64-district delivery tracking engine
Distributing physical textbooks across 64 districts required manual order entry into third-party courier portals, causing delayed deliveries and customer complaints.
Built a high-throughput logistics integration API connecting e-commerce orders directly to courier webhook streams with real-time parcel lifecycle tracking.
Transparent Pricing: What Drives API Investment?
We don't believe in surprise hourly billing traps or ambiguous deliverables. After reviewing your requirements, we provide a 100% fixed-price scope with guaranteed delivery milestones.
SaaS Integration & Webhook Engine
For connecting 2–3 third-party services, payment gateways, or courier APIs
30% Kickoff • 35% Staging Demo • 35% Handover
Custom REST / GraphQL Backend
For mobile apps, web dashboards, or portals needing a centralized engine
30% Kickoff • 35% Staging Demo • 35% Handover
Enterprise Microservices & Developer API
For multi-tenant SaaS products, high-throughput microservices, or public developer platforms
25% Kickoff • 25% Sprint 1 • 25% Staging • 25% Launch
What Factors Determine Your API's Exact Quote?
Because custom APIs are tailored to your transaction loads and data flows, final investment is calculated across four key technical drivers:
Protocol & Schema Complexity
Simple CRUD REST endpoints with straightforward JSON payloads vs. federated GraphQL subgraphs with real-time WebSocket subscriptions and complex joins.
Concurrency & Uptime SLAs
Standard business-hours operational volume vs. 100k+ RPM horizontal auto-scaling with multi-region database read-replicas and 99.99% high-availability guarantees.
Third-Party Ecosystem
Modern cloud RESTful webhooks (Stripe, Twilio, Shopify) vs. extracting and synchronizing data from legacy on-premise ERPs, SOAP interfaces, or older SQL mainframes.
Security & Compliance Rigor
Standard JWT bearer authentication vs. enterprise OAuth2 with mTLS, audit log streaming, PCI-DSS compliance guarantees, or custom hardware security module (HSM) keys.
Frequently Asked Questions
Clear, jargon-free answers to common questions non-technical founders and engineering leaders ask before starting an API project.
An API (Application Programming Interface) is a secure digital bridge that allows different software systems to talk to each other automatically. For example, when an order is placed on your website, an API instantly tells your inventory database to update, instructs your shipping carrier to print a label, and notifies your accounting software to create an invoice — without any manual data entry.
Ready to Build Fast, Resilient APIs That Scale?
You don't need a 50-page technical specification to talk to us. Tell us what software systems your company uses, your transaction bottlenecks, and what you need connected. We'll map the exact architecture with fixed pricing and clear timelines.