API Integration & Development Services

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    SMART SOLUTION

    We design, build, integrate, and modernize production-grade APIs using Python, Django, FastAPI, Celery, Redis, and PostgreSQL.

    api integration

    Most API integrations look straightforward at the start and may work perfectly under light usage. The complexity is introduced later, when traffic increases, requests start failing, data gets out of sync, or one system slows down and affects each part connected to it. At that point, a simple integration can cause a reliability challenge.

    We build API integrations using Python, Django, FastAPI, Celery, PostgreSQL, and Redis, considering such scenarios in mind from the outset. This means planning for retries, handling partial failures, and keeping data consistent, especially under load. We establish resilient, seamless connections for your solutions, ensuring they perform stably when your product grows.

    API Integration Services We Provide

    Our API development and integration services cover end-to-end engineering, focusing on both designing greenfield architectures and improving performance and reliability in existing systems.

    Custom API Development

    We build REST and GraphQL APIs, webhooks, and event-driven services using Python, Django, and FastAPI. Each API includes authentication, validation, versioning, automated testing, and clear OpenAPI documentation.
    API Development Services

    Third-Party API Integration

    We integrate products with payment providers, CRM and ERP platforms, accounting systems, marketplaces, logistics services, and other external APIs. We handle authentication, data mapping, webhooks, provider limitations, and differences between data models. API-driven integrations with external partners, including rate-limited and access-controlled environments that require stable and secure exposure layers.
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    Data Synchronization & Workflow Automation

    We build real-time, scheduled, and event-driven workflows that synchronize data across multiple systems. This includes field mapping, data transformation, validation, reconciliation, webhook processing, and multi-step business automation. For complex environments, we define a canonical data model and clear source-of-truth rules so conflicting records are resolved consistently across every connected platform.
    Data Integration

    Enterprise and Internal System Integration

    We connect ERP, CRM, accounting, SaaS, and internal applications across cloud, on-premise, and hybrid environments. Our engineers map data ownership, define a consistent data model, and implement real-time, batch, or hybrid synchronization. For complex environments, we introduce middleware or orchestration layers that manage routing, transformation, and multi-system workflows without spreading integration logic across individual applications.
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    API Performance Optimization

    We identify blocking API calls, slow webhook processing, inefficient database queries, and overloaded background queues. We then improve performance through asynchronous processing, caching, database optimization, and workload isolation.
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    Legacy API Modernization

    We connect legacy applications with modern platforms without requiring a full-system rewrite. Our engineers can build secure API wrappers around existing applications and databases, isolate legacy dependencies, and gradually move integration logic into maintainable services. Changes are introduced through staged releases with data validation and rollback planning to reduce migration and downtime risks.
    API Modernization Services

    Our approach

    How We Build Reliable API Integrations

    Production integrations must handle slow providers, repeated webhooks, incomplete responses, traffic spikes, and temporary outages. We design each integration around these real-world conditions.

    Asynchronous Processing

    We move long-running API operations to Celery and Redis background queues. Django or FastAPI can respond immediately while workers handle synchronization, notifications, data processing, and external requests.

    Data Consistency and Recovery

    We use idempotent operations, validation, PostgreSQL transactions, and event logs to prevent duplicate or conflicting records. Resumable workflows allow failed processes to continue without repeating completed steps.

    Third-Party API Resilience

    Our integrations handle timeouts, rate limits, invalid responses, and provider outages through controlled retries, exponential backoff, circuit breakers, fallback data, and delayed processing.

    Scalable Background Workloads

    We separate critical and resource-intensive operations into dedicated queues and workers. This prevents slow tasks from delaying payments, confirmations, or other time-sensitive events.

    Modular Architecture

    Integration logic is isolated in dedicated FastAPI services or Django modules with consistent validation, logging, and error-handling patterns. External API changes therefore affect only the relevant connector.

    Monitoring and Observability

    We implement structured logs, correlation IDs, latency metrics, webhook tracking, retry monitoring, and alerts. This helps teams identify and resolve integration failures before they significantly affect users.

    Security and Access Control

    We protect integration points through OAuth 2.0, JWT, SAML, role-based permissions, encryption, and secure credential management. Access is limited to the systems and data each service requires, while audit logs provide visibility into critical operations and administrative actions. Security requirements are defined during architecture design and validated before production deployment.

    Staged migration and rollback

    For migrations and major integration changes, we use staged cutovers, data validation, and rollback plans to reduce the risk of downtime or corrupted records.

    Is an existing integration becoming difficult to maintain?

    We can review its architecture, failure handling, performance, and data flows and prepare a practical improvement plan.

    Types of API Integrations We Build

    Our work spans several common integration cases across backend systems, including payments, marketplaces, internal platforms, analytics pipelines, and many more. As part of our API development and integration service, we provide reliability and data accuracy, which directly affect business operations.

    Payment & Billing Integrations

    We connect payment systems through idempotent Celery workflows with PostgreSQL transaction logs, ensuring every charge, refund, and subscription event is processed reliably without duplicates or data loss.
    Payment Gateway Integration Services

    Marketplace & E-Commerce Sync

    Our team builds order management and inventory synchronization pipelines across Amazon, eBay, and custom B2B platforms, keeping your catalog, stock levels, and fulfillment data consistent in real time.
    eCommerce Development Services

    Internal Tools & ERP Connectors

    We develop connectors for ERP systems and internal dashboards that aggregate data from multiple APIs into a single source of truth, giving your team faster access to the information they need.
    CRM Software Development Services

    Analytics & Data Pipelines

    Our team designs data pipelines for GA4 ingestion, HubSpot sync, and internal API flows that feed your analytics and reporting systems with clean, structured, up-to-date information.
    Dashboard Development Services

    Our techstack

    Technologies we use for API integration

    Each tool serves a specific purpose in our Python web API integration stack.

    Django

    Core backend framework used for authentication, data modeling, and business logic. We rely on it for structured systems where consistency, maintainability, and rapid development are required.
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    FastAPI

    Used for high-load endpoints, webhook receivers, and async microservices. It is chosen when performance and non-blocking request handling are critical.
    FastAPI Development Services

    Redis

    Serves as both a caching layer and a message broker. We use it to reduce database load, speed up repeated operations, and support task queues and rate limiting.

    Celery

    Background task processing system used for handling long-running operations, retry workflows, and scheduled jobs. It ensures that time-consuming work does not block API responses.

    PostgreSQL

    Primary transactional database providing ACID compliance. It is used where strong consistency, relational integrity, and reliable data storage are essential.

    Custom API Development Services

    Our customĀ API development servicesĀ include REST APIs, GraphQL, and event-driven architectures for startups deploying their first product to market and for enterprises that need to optimize years of accumulated integrations. Our crucial goal is to arm your software ecosystem with an API that cleanly connects your systems, handles dynamic workload, and gives your team room to add, change, and extend your solutions. Our architecture roadmap is established on security, performance, and scalability to ensure absolute protection and compliance at every layer and flow of your product.

    REST, GraphQL & Event-Driven APIs

    We build REST and GraphQL APIs, webhooks, and event-driven services tailored to your product, data flows, and performance requirements.

    API Architecture & Documentation

    We design API-first architectures with clear OpenAPI documentation, consistent versioning, and contracts that simplify integration for internal and external teams.

    API Security & Traffic Management

    We protect APIs with OAuth 2.0, JWT, role-based access, input validation, rate limiting, and other controls appropriate to your security requirements.

    Testing, Deployment & Monitoring

    We perform unit, integration, security, and load testing before deployment and implement production monitoring to track performance, availability, and failures.

    API DEVELOPMENT COST

    API Development Cost Calculator

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    Our API Development Process

    We have a well-structured flow within our custom API development services, making sure each step from an initial conversation to a production-ready system delivers maximum value for your business and ensures the expected outcomes.

    1

    Discovery and Requirements Analysis

    Our cooperation typically starts with comprehending your business goals, existing infrastructure, integration requirements, and expected traffic. Thus, we can define the most appropriate architecture and roadmap for your specific case.
    2

    Architecture and API Design

    Before proceeding with implementation, we define the structure following API-first principles: RESTful standards, OpenAPI/Swagger documentation, versioning strategy, and data contracts. As a result, we achieve a shared technical base that guides subsequent implementation decisions.
    3

    API Development

    The implementation phase of API development service covers Python backend development, database modelling, and authentication configuration, executed against the agreed technical specification, with structured code reviews and regular progress reporting throughout.
    4

    Testing and QA

    The stage covers unit tests, integration tests, load testing, and security validation for each endpoint and integration element. Delivery contains only verified and thoroughly tested code.
    5

    Deployment

    We configure CI/CD pipelines, Docker containerization, and cloud infrastructure across AWS, GCP, or Azure based on your existing setup and requirements. The process is standardized and fully predictable.
    6

    Monitoring and Optimization

    Having configured logging, performance tracking, and scaling strategies throughout the build, this stage focuses on final verification. We ensure full visibility into your API's behavior in production is in place before go-live, so issues are trackable and can be eliminated as soon as they arise.

    Real Previous Experience

    Isolated Slow APIs

    When a third-party API responds in 3 seconds instead of 300ms, that latency should not reach users. We isolated slow calls into dedicated Celery tasks with configurable timeouts and Redis-cached fallbacks.

    Optimized PostgreSQL

    Within our third-party API integration services, we optimized webhook processing and sync jobs with indexing, query plan analysis, connection pooling, and partitioning-often turning a 2.5-second load into under 100ms.

    Handled High Load

    FastAPI async with Redis buffering handles high-concurrency spikes without infrastructure scaling. This reduced response time by 70% while handling three times the previous request volume.

    Common API Integration Use Cases

    We build API integrations for recurring business workflows across ERP, CRM, ecommerce, document management, marketing, and analytics systems. Each integration is adapted to the platforms involved, data requirements, and operational impact of delayed or failed synchronization.

    Social Media and Marketing Integration

    We integrate social platforms with publishing tools, analytics systems, CRM platforms, and marketing automation workflows. This can include content scheduling, engagement data collection, social listening, advertising data ingestion, lead synchronization, and social login. Our engineers also handle OAuth permissions, token renewal, rate limits, webhooks, metric normalization, and platform API changes. Platforms may include Facebook, Instagram, LinkedIn, TikTok, YouTube, and other APIs available for the required use case.
    SaaS Application Development Services

    ERP, CRM and Accounting Integration

    We connect ERP platforms with CRM, accounting, ecommerce, payment, and internal systems. Customer records, orders, inventory, invoices, refunds, and financial data remain synchronized without manual exports or repeated data entry. For example, a storefront order can automatically update ERP inventory, trigger fulfillment, create an invoice, and send the transaction to the accounting platform.
    CRM Software Development Services

    Electronic Signature and Document Workflows

    We integrate electronic signature providers such as DocuSign, Adobe Acrobat Sign, and PandaDoc into web applications and internal workflows. The integration can generate and send documents, assign signers, track signing status, route approvals, and store completed files automatically. We also implement authentication, permissions, webhook processing, and audit trails according to the workflowā€™s security and compliance requirements.

    SaaS and Partner Ecosystems

    We build secure integrations between SaaS products, customers, vendors, and external partners while isolating provider-specific requirements from the productā€™s core application logic.
    SaaS Application Development Services

    Why Companies Choose PLANEKS

    PLANEKS combines Python API expertise with a production-first engineering approach. We build integrations that remain reliable, understandable, and extendable as products and workloads grow.

    Production-First Engineering

    We design for timeouts, repeated events, rate limits, provider outages, and incomplete responses - not only the successful request scenario.

    Python API Expertise

    Our engineers specialize in Python, Django, FastAPI, Celery, Redis, and PostgreSQL, covering APIs, webhooks, asynchronous workflows, and data synchronization.

    Maintainable Integrations

    We separate integration logic from core application code and document API contracts, data flows, dependencies, and ownership boundaries. This helps internal teams operate the system independently and add new platforms without redesigning the entire integration architecture.

    Transparent Deliver

    We map data flows and dependencies before implementation, define ownership and acceptance criteria, and release integrations in manageable, testable stages.

    Flexible Cooperation

    We can build a new integration architecture, modernize an existing system, or extend your team with experienced Python API engineers.

    Relevant Project Experience

    Our team has delivered products combining external APIs, internal systems, background processing, and transactional data flows across complex production environments.

    Integration Architecture Options

    The appropriate architecture depends on the number of connected systems, data volume, synchronization frequency, and operational impact of delayed processing. We select the integration pattern during discovery rather than applying the same approach to every project.

    01

    API-Led Integration

    Best suited to direct connections between modern applications with documented interfaces. It keeps communication predictable while allowing each system to remain independently maintainable.
    02

    Middleware and Orchestration

    Used when several systems require centralized routing, data transformation, and workflow coordination. A middleware layer replaces a growing network of difficult-to-maintain point-to-point connections.
    03

    Event-Driven Integration

    Designed for real-time workflows in which an event in one system triggers processes in others. Message queues help decouple services and process events such as orders, payments, notifications, and inventory changes asynchronously.
    04

    Data Pipeline Integration

    Built for analytics, reporting, data warehousing, and high-volume synchronization. Data is extracted from operational systems, validated and transformed, and delivered to its destination in a consistent format.

    FAQ

    Check the types of API you can integrate with us.

    Can you integrate legacy systems that do not have modern APIs?

    Yes. Depending on the system, we can build an API wrapper, middleware layer, database connector, or staged modernization solution. We assess the available interfaces, data model, security requirements, and operational risks before recommending an approach.

    Can you integrate an ERP with CRM, accounting, and ecommerce systems?

    Yes. We can connect ERP platforms with CRM, accounting, payment, inventory, ecommerce, and internal applications. The integration may use real-time APIs, scheduled synchronization, event-driven workflows, or a combination of these approaches.

    Which electronic signature platforms can you integrate

    We can integrate platforms such as DocuSign, Adobe Acrobat Sign, and PandaDoc, subject to their available APIs and the required workflow. Integrations may cover document generation, signature requests, status tracking, approval routing, webhooks, and audit records.

    Can you integrate social media APIs with CRM and analytics systems?

    Yes. We can connect supported social APIs with CRM, marketing automation, analytics, publishing, and reporting tools. Available functionality depends on each platformā€™s API, permission scopes, review requirements, and usage limits.

    Get API integration support

    Testimonials

    What do people praise about PLANEKS?

    If your systems rely on multiple APIs that need to work together reliably, we design and implement end-to-end API integrations that connect external services, internal systems, and data flows into a single cohesive architecture. Our work includes building robust integration layers, handling complex workflows, and ensuring performance, consistency, and scalability in production environments. Schedule a call to discuss your API integration setup with engineers with deep experience in system design and optimization.

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