[Hiring] SDET - API/Middleware @Welo Data

Role Description

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
• 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
• 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.

Qualifications

• 3-5+ years of hands-on expertise 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
• 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 analyzing browser-generated network traffic and reconstructing API behavior 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

Requirements

• 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
• 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

Benefits

• Rate: $9.50/hr
• Start Date: 19th October
• Duration: 5 Weeks
• Commitment: 35 Hours per Week
• Location: India (Remote)
• Job Type: Freelance

Company Description

Join our team at Welo Data and embark on a journey of growth and innovation.