Senior Full Stack Engineer (Ruby, Front End, AI) (Remote, Full-Time) [AS230]

About Smart Working At Smart Working, we believe your job should not only look right on paper but also feel right every day. This isn’t just another remote opportunity - it’s about finding where you truly belong, no matter where you are. From day one, you’re welcomed into a genuine community that values your growth and well-being. Our mission is simple: to break down geographic barriers and connect skilled professionals with outstanding global teams and products for full-time, long-term roles. We help you discover meaningful work with teams that invest in your success, where you’re empowered to grow personally and professionally. Join one of the highest-rated workplaces on Glassdoor and experience what it means to thrive in a truly remote-first world. About the Role As a Senior Full Stack Engineer, you will take end-to-end ownership of features and systems across the full stack — from backend services built in Ruby on Rails to modern frontend interfaces, playing a meaningful role in shaping both how things are built and what gets built next. You will bring a genuine product mindset to your engineering work, thinking beyond the ticket to understand the user, the business context, and the trade-offs behind every decision. Working alongside a team of engineers, you will move fast, operate with a high degree of autonomy, and actively use AI tooling as a core part of how you work, not as an afterthought, but as a natural extension of your craft. This role is ideal for a senior engineer who is energised by working across the full stack, thrives in environments where ownership is real and impact is visible, and is genuinely excited about building great products, not just maintaining them.