SDET - API/Middleware (India)

Job description

**Job Overview** Welo Global is hiring an **SDET** (Software Development Engineer in Test) to bring deep technical rigor to middleware-layer testing. This role requires strong technical expertise across gRPC-Web, Proto3, HTTP/2, JSON-RPC/REST, proxy-based traffic inspection, and API scripting. The primary responsibility is to observe and reconstruct the network interactions generated by the onboarding UI, including request/response structures, schemas, headers, identifiers, Enums, and client-injected parameters. This is primarily an API/network analysis and evidence-generation role rather than a conventional UI automation or regression-testing role. The resource will produce sanitized network evidence and controlled, benign tracer replay scripts for downstream backend validation. **Project Details** **Title:** SDET - API/Middleware **Rate:** $9.50/hr **Start Date:** 26th October **Duration:** 5 Weeks **Commitment**: 35 Hours per Week **Location:** India (Remote) **Job Type:** Freelance (with the possibility of full time employment based on performance and project needs in all opportunity) ### Responsibilities • Design, build, and maintain automated API test suites covering gRPC-Web, Proto3, HTTP/2, and JSON-RPC/REST-based services • Export clean, sanitized HAR/network evidence while maintaining traceability between UI actions and corresponding network requests • Map relevant schemas, headers, identifiers, routing information, and client-injected parameters • Use proxy tools such as Mitmproxy, Charles Proxy, and browser DevTools to inspect, intercept, and validate network traffic between client and server • Develop and maintain API automation scripts using Python, Postman, and cURL for functional and regression testing • Analyze protocol-level request/response behavior to identify defects related to serialization, encoding, and transport • Inspect and validate request payload structure, including system-level headers (e.g., auth tokens, routing identifiers) and internal/hidden parameters, ensuring correct handling under both valid and malformed conditions • Collaborate with backend and middleware engineers to define testable contracts and edge-case scenarios • Continuously improve test automation frameworks for reliability, speed, and maintainability • Document technical findings, automation coverage, and known protocol-level limitations ### Required Qualifications • Strong hands-on expertise of 3-5+ years with gRPC-Web, Proto3, HTTP/2, and JSON-RPC/REST protocols • Proficiency with proxy/traffic inspection tools including Mitmproxy, Charles Proxy, and browser DevTools • Solid scripting/programming skills in Python, with practical use of Postman and cURL for API automation • Experience designing and maintaining automated test suites for middleware or API-layer services • Working understanding of API request structure, including headers, auth tokens, and internal/system parameters, and how to test for their correct handling • Understanding of software engineering practices as applied to test automation (version control, CI integration, code review) • Strong debugging skills at the network/protocol level • Experience analysing browser-generated network traffic and reconstructing API behaviour is strongly preferred • Experience with HAR analysis, API schema reconstruction, or controlled API replay is strongly preferred • Ability to work within approved staging/test environments and follow defined data-handling and test-authorization requirements is required #L1-CC1