Senior Software Engineer

About Magpie At Magpie, we envision a world where every child, no matter their background, becomes a confident reader. Our nonprofit team combines research-backed instruction, joyful game design, and innovative technology to tackle America’s reading crisis head-on — with the goal of eradicating illiteracy through a digital-first, student-centered approach. Role Summary We’re seeking an experienced Full Stack - Senior Software Engineer to join our small, mission-driven Platform team. You’ll wear many hats, work across boundaries, and help us build a platform that scales impact—not just traffic. In this role, you’ll design and build the core systems that power Magpie’s learning experiences, from scalable backend services to intuitive front-end interfaces and reliable data pipelines. You’ll help create experiences that meet every child where they are in their learning journey, while unlocking actionable insights for educators and families. You’re drawn to missions that matter. You think deeply about the systems behind learning, not just the code. You balance pragmatism with curiosity and build for the long term. The ideal candidate pairs strong technical execution with deep empathy for users, thrives in a collaborative startup environment, and is motivated by the opportunity to make reading joyful and accessible for all. What You’ll Do: Design and build platform capabilities that deliver reliable, high-value features with safety, precision, and user focus. Collaborate closely with product managers, designers, and fellow engineers to create new features and improve existing ones. Approach the platform as a product: maintain a clear understanding of customer needs, identify friction points, and take ownership of outcomes with metrics-driven decision making (KPIs, OKRs, and North Star metrics). Use data to inform decisions, measure impact, and drive improvements through empirical evidence. Take ownership across all phases of development, from design to production, and monitor system performance in live environments. Continuously improve the flow of work from idea to production, using data to identify and remove friction. Write clean, efficient, and well-documented code following best practices. Build and maintain APIs, and integrate with third-party services. Ensure application performance, quality, and responsiveness across platforms. Participate in code reviews, testing, and debugging to maintain high-quality deliverables. Mentor other engineers and contribute to their growth. Contribute to architectural decisions and help define technical standards and best practices. Stay up to date with emerging technologies and suggest improvements to enhance development processes.