Welo Data
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1001 to 5000 Employees · New York, US
What employees say
+ It has the kind of jobs I want to work in and they are are remote which is all I'm looking for.
− They have you do the application and fill out their papers and do the tests and put in your direct deposit information, but they never have tasks on the jobs and then you will get
More reviews on the company profile.
Job description
Overview
Welo Global is hiring an SDET (Software Development Engineer in Test) to bring deep technical rigor to middleware-layer testing.
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
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
- 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
- Ability to work within approved staging/test environments and follow defined data-handling and test-authorization requirements is required.
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Job application FAQ
Last updated 30 September 2026
- How do I apply for SDET- API/Middleware at Welo Data?
- Open this job on Feedback AI and sign up free (or sign in). You can apply from the job detail page; match scores and skill gaps appear when your profile is complete. Welo Data may attach structured assessments to interview rounds after you apply.
- Does Feedback AI show a match score for this SDET- API/Middleware role?
- Yes after you add a resume or skills. Match score ranks this role against your profile — skills met, gaps, level, and location — so you prioritise applications where fit is strongest.
- Is SDET- API/Middleware remote or on-site in Anywhere?
- This listing is marked remote with location Anywhere. Confirm details on the job description before applying.
- What skills matter for this SDET- API/Middleware role at Welo Data?
- Key skills for this role include Remote. Upload a resume to see which requirements you already meet and which are gaps.