Keystone Recruitment · 8 hours ago
Software Engineer III
Seattle, WA
Full-time
Hybrid
Entry, Mid Level
$100/hr - $120/hr
2+ years expKeystone Recruitment is seeking a highly skilled Software Engineer III to design, develop, and scale mobile applications serving millions of users. This role focuses on building high-performance, maintainable mobile software while collaborating with cross-functional teams across the full software development lifecycle.
Staffing & Recruiting
Responsibilities
Design, develop, test, and maintain mobile applications (iOS or Android)
Build scalable, high-performance features used by millions of active users
Apply multithreading and memory management best practices
Contribute to API design and system architecture decisions
Develop maintainable and testable codebases
Implement unit testing and automation frameworks
Improve application performance, reliability, and stability
Troubleshoot issues and implement system improvements
Participate in full SDLC: requirements gathering, design, development, testing, and release
Collaborate with product, QA, and backend teams
Support production releases and resolve post-launch issues
Provide mentorship and technical guidance when appropriate
Qualification
Required
2+ years of experience building mobile applications (Android or iOS)
Experience with multithreading and mobile memory management
Shipped at least one large-scale product to production supporting millions of users
Strong experience writing maintainable, testable code
Experience with API design, unit testing, and automation
Strong problem-solving and debugging skills
Solid understanding of software development lifecycle (SDLC)
Ability to work independently and manage time effectively
Strong communication and collaboration skills
Familiarity with system-level software concepts
Bachelor's degree in Computer Science, Software Engineering, or related field
Company
Keystone Recruitment
Great companies are built on strong people. At Keystone Recruitment, we identify the pivotal talent that holds your organisation together.
11-50 employeesFunding
Current Stage
Early StageCompany data provided by crunchbase