SDET- APIMiddleware

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: 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

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.