KISS Software / Custom API Integration Services for Scalable, Real-Time Business Connectivity

Custom API Integration Services for Scalable, Real-Time Business Connectivity

Seamlessly connect your apps with our adapted API integration services. From SaaS and CRM to payment and ERP systems - fast, secure, and scalable integration.

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    Why KISS Software?

    • Experienced integrators for complex API ecosystems
      Experienced integrators for complex API ecosystems

      We’ve worked with fintech, eCommerce, SaaS, agriculture, and logistics — we handle any API complexity.

    • Reliability and scalability by default
      Reliability and scalability by default

      Our integrations don’t break under load, don’t lose data, and are built for future growth.

    • Flexibility for your architecture
      Flexibility for your architecture

      We don’t force solutions — we adapt to your existing stack and business reality.

    What we will do for your project

    Analysis of existing systems and integration requirements

    We study your software architecture, identify integration points, and prepare technical specifications considering API limits and business goals.

    Custom API connector development

    We build reliable adapters that exchange data in real time and ensure stable synchronization.

    Integration of SaaS, cloud services, CRM, ERP & payments

    From SAP and 1C to Stripe, Salesforce, HubSpot, Bitrix, Telegram, and more.

    Error handling, logging & retry mechanisms

    Failure protection, monitoring, caching, and automatic retries to ensure stability.

    API performance optimization & scalability

    Rate limiting, pagination, queues, and webhooks — ready for traffic growth.

    Documentation & integration support

    Clear documentation, team onboarding, and continuous development for new needs.

    Need fast and reliable data exchange between services?

    Unify your systems, data, and processes into a single business ecosystem
    Discuss API architecture

      Our projects

      More projects

      Testimonials

      Мы заказывали у KISS Software анимацию для 2D-платформера. Ребята сразу поняли нашу стилистику, предложили интересные решения по эмоциям персонажей, а результат превзошёл ожидания. Игроки отмечают именно «живость» анимации. Будем работать ещё.
      Андрей
      гейм-дизайнер
      Нужно было подключить аутсорс на этапе риггинга и внутриигровых синематиков под Unreal Engine. KISS вошли в проект аккуратно, без долгих вводных, всё отдали в срок, багов — ноль. Отличная техничка, быстрая реакция и понимание продакшн-процесса.
      Михаил
      продюсер, студия разработки игр
      Уже третий проект делаем с командой KISS — всегда всё прозрачно, по делу и вовремя. У них реально хорошее чувство гейм-драмы и движущейся композиции. Отдельно ценим их подход к оптимизации под мобильные платформы.
      Денис
      CEO

      API integration stages

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      Briefing & system audit
      You describe which systems need to be connected and what data must be transferred. We analyze architecture, API availability, documentation, and limits. Assess risks, vulnerabilities, and scalability. Define integration type: uni-directional, bi-directional, batch, or real-time. Build data-flow logic.
      Time to deliver
      ~ 1-2 days
      API architecture designархитектуры API
      Define entry/exit points, methods, authentication (OAuth2, JWT, etc.). Design data models, routes, headers, JSON/XML schemas. Map microservices, caching, and queues. Plan scaling, fallback, and monitoring. Architecture is approved before development.
      Time to deliver
      ~ 2-4 days
      Development & testing
      Build secure and high-performance API endpoints. Test correctness, response times, and compatibility. Implement error handling, retries, and timeouts. Perform load, stress, and failover testing. Validate on staging with real data.
      Time to deliver
      ~ 3-7 days
      External & internal service integration
      Connect SaaS and on-premise systems: CRM, ERP, billing, payment gateways, webhooks, and web services. Ensure encryption, authorization, and full logging. Prepare fallback solutions for third-party outages. Test production workflows end-to-end.
      Time to deliver
      ~ 5-15 days
      Documentation & handover
      Create API documentation: endpoints, methods, data types. Prepare guides for internal teams or external integrators. Train your specialists on REST and event handling. Deliver keys, tokens, monitoring, and logs. Set up CI/CD pipelines for automated deployments.
      Time to deliver
      ~ 2-4 days
      Support, scaling & evolution
      SLA support and log monitoring after launch. Update connectors for new API versions. Add new integrations or migrate to microservices. Analyze performance and optimize requests. We act as your long-term technical partner.
      Time to deliver
      ~ 1-2 days

      Technologies and tools we use

      java photo
      Java
      Javascript
      Javascript
      MySQL
      PHP photo
      PHP
      java photo
      Java
      Javascript
      Javascript
      MySQL
      PHP photo
      PHP

      FAQ

      We implement alternatives: parsing, email-to-API, FTP, or custom middleware.

      Yes — Stripe, PayPal, WayForPay, Fondy, LiqPay, and more.

      Absolutely. We use webhooks, queues, and event-driven architectures.

      Want to connect all systems into one?

      We’ll unify your business into a seamless, resilient ecosystem

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