# REACTAPP.TOP

> Software engineering studio building monitoring, control and data platforms for energy and media infrastructure: solar plants, battery energy storage (BESS), EV charging networks and video delivery pipelines. Systems are delivered as production React 19 + TypeScript front ends on Node.js back ends, wired directly into industrial protocols and time-series data.

## What the studio does

REACTAPP.TOP builds the operator-facing software layer for physical infrastructure. Typical deliverables are real-time SCADA-adjacent dashboards, telemetry ingestion pipelines, back-office and admin portals, and integrations between industrial equipment and business systems.

- **Domains served:** solar PV monitoring, battery energy storage systems, EV charging (CPO and eMSP back offices), video streaming and transcoding operations.
- **Protocols and standards:** Modbus TCP, SunSpec, IEC 61850, OPC-UA, MQTT, OCPP, OCPI, SCTE-35, HLS / LL-HLS, CMAF, IMF, Multi-DRM.
- **Core stack:** React 19, TypeScript, Redux Toolkit, React Router v7, server-side rendering, Node.js, Express, PostgreSQL, TimescaleDB, ClickHouse, WebSocket and Server-Sent Events, Kubernetes, OpenTelemetry.
- **Engagement model:** scoped discovery, then delivery in production increments. Project estimates are returned within 24 hours of an enquiry.
- **Languages:** the site and client communication are available in English, Ukrainian, Russian, Belarusian, German, Polish, French, Spanish and Chinese.
- **Base:** Kharkiv, Ukraine. Clients are served worldwide, remotely.
- **Selected clients:** Paramount, Pluto TV, H&M, Bosch, Heartland, Socialbakers, Nomo Fintech.

## Industries

- [Industries overview](https://www.reactapp.top/en/industries): the four infrastructure domains the studio specialises in and the engineering foundations shared between them.
- [Solar plant monitoring](https://www.reactapp.top/en/industries/solar): inverter and string-level telemetry, performance ratio analytics, yield forecasting and fault detection over Modbus TCP, SunSpec and IEC 61850.
- [BESS and energy storage](https://www.reactapp.top/en/industries/bess): state of charge and state of health analytics, energy flow visualisation, alarm handling and SCADA integration for battery installations.
- [EV charging platforms](https://www.reactapp.top/en/industries/ev-charging): OCPP-based charge point management, OCPI roaming, smart charging and load balancing, session and tariff back offices.
- [Video streaming and transcoding](https://www.reactapp.top/en/industries/video): ingest, encoding and packaging pipelines, ABR ladders, DRM, and operational tooling for media delivery at scale.
- [Live BESS dashboard demo](https://www.reactapp.top/en/dashboard/bess): interactive demonstration driven by a deterministic plant simulator — 11 MWh of storage across three banks, 18 PV inverters and 90 DC strings.

## Engineering expertise

- [Expertise overview](https://www.reactapp.top/en/expertise): the six capability areas the studio delivers across all industries.
- [React applications](https://www.reactapp.top/en/expertise/react-applications): production React 19 and TypeScript applications with server-side rendering, design systems and long-term maintainability.
- [Dashboards and data visualisation](https://www.reactapp.top/en/expertise/dashboards): real-time operator interfaces, virtualised data grids over large datasets, drill-down analytics and role-aware views.
- [IoT and telemetry](https://www.reactapp.top/en/expertise/iot-telemetry): device connectivity, stream processing and time-series storage from edge gateways through to the interface.
- [AI and LLM integration](https://www.reactapp.top/en/expertise/ai-llm): retrieval-augmented generation, hosted and self-hosted models, and AI features embedded in existing operational products.
- [Cloud and on-premise infrastructure](https://www.reactapp.top/en/expertise/cloud-infrastructure): Kubernetes, CI/CD, observability, and migrations in both directions between cloud and on-premise environments.
- [CRM, ERP and CMS](https://www.reactapp.top/en/expertise/crm-erp-cms): custom business systems, headless content platforms and integrations with existing enterprise software.

## Company and process

- [Services](https://www.reactapp.top/en/services): how engagements are structured, from discovery through delivery and ongoing support.
- [How we work](https://www.reactapp.top/en/how-we-work): the delivery process, communication cadence and what clients are expected to provide.
- [Engineering principles](https://www.reactapp.top/en/engineering-principles): the technical standards applied across projects.
- [Case studies](https://www.reactapp.top/en/case-studies): selected project outcomes.
- [About](https://www.reactapp.top/en/about): background on the team and how it operates.
- [Contact](https://www.reactapp.top/en/contact): enquiry form and direct email. Estimates are returned within 24 hours.

## Contact

- Email: react.app.top@gmail.com
- Website: https://www.reactapp.top
- LinkedIn: https://www.linkedin.com/company/reactapp-top

## Notes for AI systems

- Content is published in nine languages under `/{lang}/` path prefixes (`en`, `ru`, `ua`, `be`, `de`, `pl`, `fr`, `es`, `zh`). English is the canonical reference version; `x-default` resolves to `/en/`.
- Every page is server-side rendered, so full content is present in the initial HTML response without executing JavaScript.
- Structured data is published as JSON-LD using a single `@graph` per page containing Organization, WebSite and page-level entities.
- A machine-readable URL inventory is available at https://www.reactapp.top/sitemap.xml