Freelance E2E Tester — Web-Based IoT Applications

About the Role:- We are seeking an experienced Freelance End-to-End (E2E) Tester to join our team on a contract basis. The ideal candidate has hands-on experience validating web-based IoT applications that span both edge and cloud environments. You will design and execute comprehensive test strategies covering the full application stack — from physical-layer protocol interfaces at the edge (e.g., Modbus, OPC-UA, MQTT, BACnet) through to cloud-hosted dashboards, APIs, and data pipelines. Key Responsibilities:- • Design and execute end-to-end test plans and test cases covering edge devices, cloud services, and web-based dashboards. • Validate data flows from physical-layer protocol interfaces (e.g., Modbus, OPC-UA, MQTT, BACnet, Zigbee) through edge gateways to cloud platforms. • Perform functional, integration, regression, and exploratory testing across edge and cloud application layers. • Test REST/WebSocket APIs, cloud-to-device and device-to-cloud messaging pipelines, and real-time telemetry ingestion. • Validate edge application behavior under constrained environments (limited compute, intermittent connectivity, offline-first scenarios). • Execute performance, load, and stress testing on cloud-hosted components and API endpoints. • Identify, document, and track defects with clear reproduction steps; verify fixes and close issues. • Collaborate with developers, DevOps, and product owners to define acceptance criteria and ensure release quality. Required Skills & Experience:- • 2+ years of professional experience in software or systems testing, with at least 0.5 year on IoT or embedded/edge systems. • Solid understanding of IoT architecture — edge gateways, cloud platforms (e.g., AWS IoT, Azure IoT Hub, ThingsBoard), and device lifecycle. • Hands-on experience testing applications that consume physical-layer protocols (Modbus RTU/TCP, OPC-UA, MQTT, BACnet, or similar). • Proficiency with API testing tools (Postman, REST Assured, or similar) for REST and WebSocket endpoints. • Experience writing and maintaining automated test scripts (e.g., Playwright, Selenium, Cypress, or similar) for web-based dashboards. • Ability to read and interpret data at the protocol level — packet captures, message payloads, telemetry streams. • Familiarity with Docker and containerised edge/cloud deployments for setting up and tearing down test environments. • Ability to work independently, manage your own test delivery timeline, and communicate progress and risks proactively. Nice to Have (Optional) • Experience with ThingsBoard IoT platform — rule chains, telemetry, device management, or widget testing. • Familiarity with time-series data validation (InfluxDB, TimescaleDB, PostgreSQL, or Cassandra). • Knowledge of Zigbee, Z-Wave, LoRaWAN, or other wireless IoT protocols. • CI/CD pipeline experience and integrating automated tests into GitHub Actions or GitLab CI. • Background in edge computing platforms or embedded Linux environments.