Tech Stack & Architecture

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epilot is a multi-tenant SaaS platform for energy suppliers, municipal utilities, grid operators, and solution providers. It provides a 360° energy XRM (extended relationship management) to digitize sales, service, and grid processes end-to-end.

What is an energy XRM?

Overview

The epilot application consists of:

• The epilot 360 portal — single-spa micro-frontend SPA
• Embeddable Journey Frontends — customer-facing forms and flows
• epilot Portals — white-label self-service portals for end-users, with mobile app support
• Serverless microservices with public APIs

Architecture

epilot runs entirely on AWS in the EU (Frankfurt) region as a cloud-native, serverless platform.

The backend is composed of independent microservices deployed as Lambda functions behind API Gateway. Services communicate asynchronously through EventBridge and SQS. All APIs follow an API-first design — OpenAPI contracts are defined before implementation, powering auto-generated SDKs and documentation.

The frontend consists of multiple independently deployable applications — the epilot 360 portal (a single-spa micro-frontend SPA), embeddable journey frontends, and white-label end-user portals — all built with React or Svelte and sharing the Volt UI design system.

Tech Stack

Frontend

Technology	Role
React	Main UI framework
Svelte	Used in select micro-frontends
single-spa	Micro-frontend orchestration for the epilot portal
Tailwind CSS	Utility-first CSS framework
Volt UI	epilot design system (React and Svelte)
Capacitor	Hybrid native runtime for portal mobile apps
Axios / openapi-client-axios	HTTP client with OpenAPI type generation

Backend

Technology	Role
AWS Lambda	Serverless compute for all microservices
API Gateway (HTTP API)	API routing and authorization
Step Functions	Workflow orchestration
EventBridge	Event-driven communication between services
S3	File and object storage
SQS	Message queuing
openapi-backend	OpenAPI-first request handling
Zod	Runtime schema validation

Databases

Technology	Role
DynamoDB	General-purpose data store for microservices
Elastic Cloud	Full-text search and indexing for business entities
ClickHouse Cloud	Analytical queries, Datalake, workflow data, audit logs
Momento	Caching

Tech Radar

See the epilot Tech Radar for a detailed technology landscape.

Further Reading

• API First — OpenAPI contract-first design and code generation
• Microfrontends — single-spa orchestration of the epilot 360 portal
• SDK — Auto-generated TypeScript SDK for epilot APIs
• Security — Multi-tenant isolation, authentication, authorization, and encryption
• Serverless — AWS Lambda-based microservice architecture
• Continuous Delivery — Trunk-based development, canary and stable release channels
• Design System — Volt UI component library for React and Svelte
• Open Source — Public repositories and community contributions