SDET- API/Middleware

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: 19th October

Duration: 5 Weeks

Commitment: 35 Hours per Week

Location: India (Remote)

Job Type: Freelance

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