In this episode of Señors @ Scale, Front-End Engineer and ADPList Top 100 Mentor Eduardo Aparicio-Cardenas joins Dan to talk about mentorship, career growth, and leadership at scale — from debugging real-world performance issues to guiding engineers through promotions and burnout.Eduardo shares lessons from 15+ years building web products, why perception often matters more than output for promotions, and how curiosity and frustration can be powerful motivators for learning. He breaks down what makes a strong tech lead, how to run compelling mock interviews, and why knowledge sharing is the ultimate multiplier for both mentor and mentee.They also discuss system design interviews (and why front-end design is often overlooked), strategies for breaking down problems, and what it truly means to grow from senior to staff to principal engineer.🎯 Whether you're mentoring juniors, preparing for a promotion, or just trying to be a better communicator on your team, this episode is packed with practical advice for engineers navigating their careers.Get in touch with Eduardo here https://eduardo-aparicio-cardenes.website, https://medium.com/@byeduardoac and if you are looking for a mentor: https://adplist.org/mentors/eduardo-dev or https://eduardo-aparicio-cardenes.website/mentor-profileChapters00:00 Journey to Front-End Engineering11:11 Transitioning to Happening and Current Projects18:51 Becoming a Mentor and Sharing Knowledge19:14 The Journey of Mentorship23:37 Understanding Mentee Needs28:18 The Importance of Sharing Knowledge31:43 Personal Growth and Agency36:13 Navigating Promotions and Perception39:16 Navigating Project Expectations in Tech Companies41:56 The Role of a Tech Lead44:39 Effective Communication in Tech47:18 Interview Strategies for Success49:54 System Design Insights52:22 Handling Burnout and Career Growth54:48 Recommended Reads for ProfessionalsFollow & Subscribe:📸 Instagram: https://www.instagram.com/senorsatscale/📸 Instagram: https://www.instagram.com/neciudev🎙 Podcast URL: https://neciudan.dev/senors-at-scale📬 Newsletter: https://neciudan.dev/subscribe💼 LinkedIn: https://www.linkedin.com/in/neciudan💼 LinkedIn: https://www.linkedin.com/company/se%C3%B1ors-scale/#softwareengineering #mentorship #frontend #career #promotion #systemdesign #burnout #staffengineer #leadership #señorsatscale #techtalks #webdevelopmentDon’t forget to like, comment, and subscribe for more engineering stories from the front lines. Have you had a mentor who changed the course of your career? Share your story below 👇