(Contract) Software Engineer - Android / SDK (Kotlin, Kotlin Multiplatform, C++)

Southworks

Argentina (Remote); Brazil (Remote); Colombia (Remote); Costa Rica (Remote); Mexico (Remote); Uruguay (Remote) (Argentina (Remote)) Remote permanent

Posted: February 13, 2026

Required Skills

Job Description

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 every Speedtest client, 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

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Design and build core SDK and library features used by Speedtest clients and third-party partners

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Develop network testing functionality using Kotlin and Kotlin Multiplatform

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Build and maintain performance-critical components using C++

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Maintain and support legacy SDK products built in Java

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Design clean, well-structured and easy-to-use APIs for both SDK and application use

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Work close to Android platforms, device hardware and, in some cases, embedded environments

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Ensure high levels of reliability, flexibility, portability and code reuse

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Implement analytics and telemetry to monitor performance and behavior in production

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Write unit, integration, load and stress tests

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Debug and troubleshoot complex, multi-layer and multi-platform issues

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Collaborate on architecture and technical decisions across SDK, frontend, backend and distributed server teams

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Contribute to documentation, developer support and long-term maintenance of SDKs

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Participate in code reviews and continuous improvement of engineering practices

What we’re looking for

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5+ years of professional software development experience

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3+ years of professional Android development experience

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Strong proficiency in Kotlin and Java

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Solid knowledge of data structures, algorithms and design patterns

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Hands-on experience building and maintaining SDKs or reusable libraries

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Strong understanding of Android Framework and Android SDK development

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Experience with threading, concurrency and performance optimization on Android

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Experience with networking frameworks such as OkHttp and TCP sockets

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Strong understanding of networking fundamentals (IP, TCP/UDP, HTTP/S, WebSockets)

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Experience designing cross-platform libraries (Kotlin Multiplatform or similar)

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Experience writing unit, integration, load and stress tests

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Strong debugging and troubleshooting skills

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Experience working with Git-based workflows (branches, pull requests, code reviews)

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Experience with CI/CD pipelines

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Ability to ramp up quickly on new projects and complex codebases

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Strong communication and collaboration skills in distributed teams

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High level of ownership, autonomy and time-management skills

Nice to have

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Experience with C++

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Experience with Swift

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Experience contributing to open-source projects

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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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