SDET- API/Middleware

Job Overview

Welo Global is hiring anSDET(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 whilemaintainingtraceability between UI actions and corresponding network requests.
• Map relevant schemas, headers, identifiers, routing information, and client-injected parameters.
• Use proxy tools such asMitmproxy, Charles Proxy, and browserDevToolsto inspect, intercept, andvalidatenetwork traffic between client and server
• Develop andmaintainAPI automation scripts using Python, Postman, andcURLfor functional and regression testing
• Analyzeprotocol-level request/responsebehaviortoidentifydefects related to serialization, encoding, and transport
• Inspect andvalidaterequest 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-onexpertiseof3-5+ yearswithgRPC-Web, Proto3, HTTP/2, and JSON-RPC/REST protocols
• Proficiencywith proxy/traffic inspection tools includingMitmproxy, Charles Proxy, and browserDevTools
• Solid scripting/programming skills in Python, with practical use of Postman andcURLfor API automation
• Experience designing andmaintainingautomated 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 isrequired.