Type: Contract, per-project.
Location: Remote - alignment with North America is preferred (ideally Pacific Time, acceptable PT-ET).
Availability: Contractor (40 hours per week)

We’re looking for a highly capable Software Engineer to join our Powered team and help build the core libraries behind our product as well as the SDKs used by device manufacturers and third-party application developers worldwide.

You’ll work on low-level networking features, platform-specific implementations and cross-platform SDKs that directly impact how millions of users measure and understand their Internet performance.

What you’ll do

Design and build core SDK and library features used by our clients and third-party partners
Develop network testing functionality using Kotlin and Kotlin Multiplatform
Build and maintain performance-critical components using C++
Maintain and support legacy SDK products built in Java
Design clean, well-structured and easy-to-use APIs for both SDK and application use
Work close to Android platforms, device hardware and, in some cases, embedded environments
Ensure high levels of reliability, flexibility, portability and code reuse
Implement analytics and telemetry to monitor performance and behavior in production
Write unit, integration, load and stress tests
Debug and troubleshoot complex, multi-layer and multi-platform issues
Collaborate on architecture and technical decisions across SDK, frontend, backend and distributed server teams
Contribute to documentation, developer support and long-term maintenance of SDKs
Participate in code reviews and continuous improvement of engineering practices

What we’re looking for

5+ years of professional software development experience
3+ years of professional Android development experience
Strong proficiency in Kotlin and Java
Solid knowledge of data structures, algorithms and design patterns
Hands-on experience building and maintaining SDKs or reusable libraries
Strong understanding of Android Framework and Android SDK development
Experience with threading, concurrency and performance optimization on Android
Experience with networking frameworks such as OkHttp and TCP sockets
Strong understanding of networking fundamentals (IP, TCP/UDP, HTTP/S, WebSockets)
Experience designing cross-platform libraries (Kotlin Multiplatform or similar)
Experience writing unit, integration, load and stress tests
Strong debugging and troubleshooting skills
Experience working with Git-based workflows (branches, pull requests, code reviews)
Experience with CI/CD pipelines
Ability to ramp up quickly on new projects and complex codebases
Strong communication and collaboration skills in distributed teams
High level of ownership, autonomy and time-management skills

Nice to have

Experience with C++
Experience with Swift
Experience contributing to open-source projects
Previous experience working with embedded or hardware-adjacent environments

(*) SOUTHWORKS only hires individuals from countries that are not blocked or sanctioned by the United States, including those identified on the United States Office of Foreign Asset Control (OFAC).

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