Join the LLR family of private equity-backed growth companies.

At 3Si, our mission is to make your world, safer. As a global leader in innovative security technology, we help businesses and law enforcement prevent and respond to crime through field-proven solutions and trusted partnerships. With over 100+ years of combined experience through our merged companies, our expertise drives measurable impact in communities worldwide.

We specialize in GPS tracking, video surveillance, and integrated response technologies that deter theft and accelerate criminal apprehension. Designed for retail, financial institutions, law enforcement, and more, our solutions combine cutting-edge tools with unmatched response capabilities. Through our exclusive DirectToDispatch™ technology, verified crime alerts are sent directly to law enforcement dispatch centers in real time—bypassing traditional third-party monitoring delays—to enable rapid, precise response

when it matters most.

At 3Si, meaningful work makes a difference. We’re a purpose-driven team that values innovation, trust, and collaboration. From engineering to sales and support, every role contributes to our mission to protect communities and make the world safer. We offer a hybrid, flexible work culture, competitive benefits, and the chance to grow alongside a team of passionate, dedicated professionals.

Join us—and be part of something that matters. The Technical Team Lead is responsible for designing, building, and maintaining a high-quality, scalable web application for mapping GPS trackers and delivering alerts to users. This role plays a key part in driving the architectural direction of web projects and leading a team of web developers to implement changes.

· Design, develop, and maintain dynamic, data-driven web applications using modern front-end and back-end technologies

· Design, develop, and maintain dynamic, data-driven mobile applications

· Willingness to make mission critical decisions and assume ownership of platform and architecture

· Lead architectural and design decisions for new and existing web projects

· Write clean, maintainable, well-documented code and enforce best practices through code reviews

· Optimize applications for maximum speed, scalability, and cross-browser compatibility

· Implement security and data protection measures within web solutions

· Troubleshoot and debug issues across the full web stack

· Stay up to date with industry trends and emerging technologies

Knowledge, Skills, and Abilities

· Strong proficiency with server-side languages and frameworks (PHP)

· Familiarity with RESTful APIs, databases (SQL and NoSQL), and web services

· Familiarity with front-end technologies

· Experience with Test-Driven Development (TDD) and writing unit, integration, and end-to-end tests

· Proficient with version control tools (e.g., Git) and CI/CD practices

· Strong understanding of responsive design, accessibility standards, and cross-browser development

Qualifications

· Bachelor’s degree in Computer Science, Web Development, or related field

· 5+ years of professional web development experience

Additional Comments

· This position is a remote eligible position. Preferred location in Georgia/Southeast Region of the U.S.

· Occasional travel and In-office requirements of approximately 15-25% of the time.