Senior Staff Software Engineer

Who Are We? UniUni is a dynamic and fast-growing courier service operating in the US and Canada, dedicated to transforming e-commerce logistics. With cutting-edge technology and a relentless drive, we optimize last-mile delivery to meet the ever-evolving demands of online shoppers within an evolving industry. Handling hundreds of thousands of parcels daily, we have established ourselves as a trusted leader in the industry, ensuring speed, efficiency, and reliability for e-commerce and logistics companies across North America. What Do We Offer? At UniUni, we provide more than just jobs—we create pathways for growth and success. Whether through vertical promotions or lateral moves, we believe every role should expand your skills, enhance your experience, and contribute to a fulfilling career. We recognize that you're not just looking for work—you’re building a future. If you're ready to join a dynamic, fast-paced team where hard work meets an energetic and fun environment, apply today and show us how you can be part of UniUni’s success story. Why This Role? Every p arcel UniUni deli vers is powered by software. As a Senior Staff Software Engineer, you won't just write code — you'll shape the systems that move millions of packages across North America. You'll work on hard problems: real-time logistics routing, high-throughput data pipelines, and platforms built for scale. If you want your work to have a direct, visible impact on how e-commerce moves, this is that role. About the Role The Senior Staff Software Engineer is a senior technical leader within UniUni's engineering organization, reporting to the Chief Technology Officer. This individual drives the design, development, and delivery of scalable, high-performance software that powers our logisticsplatform. Beyond hands-on engineering, this role requires strong architectural judgment and the ability to mentor and influence across teams. You will play a key role in shaping UniUni's technology direction as we continue our rapid expansion across North America. What you'll do Design, build, and maintain robust application software using PHP (core and frameworks) and TypeScript, with a focus on scalability and long-term maintainability. Architect and implement full-stack solutions, seamlessly integrating server-side logic with frontend interfaces. Lead troubleshooting and root-cause analysis of backend systems, identifying and resolving complex issues efficiently. Design, build, and integrate RESTful APIs that support internal and external consumers. Architect and manage relational and non-relational data storage solutions, ensuring performance, reliability, and data integrity. Conduct comprehensive code reviews and drive continuous improvements to codebases for enhanced performance and maintainability. Establish and enforce engineering best practices, coding standards, and documentation guidelines across the team. Collaborate with product managers, designers, and cross-functional teams to deliver high-quality full-stack web applications. Mentor and coach junior and mid-level engineers, fostering a culture of technical excellence and continuous learning. Contribute to architectural decision-making and technology roadmap planning. Qualifications Technical Skills 10+ years of professional experience building production-grade applications, with strong backend expertise (PHP experience highly valued). Deep expertise in one or more PHP frameworks: Laravel, Yii, or Symfony. Strong proficiency in HTML, CSS, and JavaScript, with hands-on React experience. Proven ability to design and manage relational (MySQL, PostgreSQL) and non-relational (MongoDB, Redis) databases, including schema design and query optimization. Extensive experience with API design and integration (REST). Expert-level knowledge of OOP principles, design patterns, and web architectural patterns (MVC, microservices, event-driven). Leadership & Collaboration Track record of leading technical initiatives and delivering com