Senior Full Stack Engineer; Ruby, Front End, AI; Remote, 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.

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.

• Design, build, and maintain robust full stack features across backend and frontend layers, taking end-to-end ownership of what you ship.
• Work primarily with Ruby on Rails on the backend, with strong consideration given to equivalent experience in Python, Rust, or Go.
• Build and maintain frontend interfaces using modern frameworks and languages, contributing to a high-quality user experience.
• Actively use AI tools and techniques as part of your engineering workflow, from code generation and review to broader problem-solving and productivity.
• Bring a product mindset to your work, understand the user, the business context, and the trade-offs behind every technical decision.
• Collaborate with teammates across engineering, design, and product to deliver features that are well-scoped, well-built, and well-tested.
• Contribute to code reviews, technical discussions, and engineering standards, raising the bar for quality across the team.
• Identify and address technical debt, performance bottlenecks, and scalability concerns proactively.
• Take initiative in ambiguous situations, propose solutions, drive decisions forward, and deliver without needing to be closely managed.

• 5+ years of professional software engineering experience in a full stack or backend-heavy role.
• 2+ years of hands‑on experience with Ruby on Rails in a production environment, exceptional candidates with equivalent depth in Python, Rust, or Go will also be considered.
• 2+ years of experience working with frontend languages or frameworks (e.g. React, Vue, Type Script, JavaScript) in production‑grade applications.
• Demonstrable AI fluency, active and confident use of AI tools (e.g. Copilot, Cursor, ChatGPT, Claude, or similar) as part of your daily engineering workflow, with at least 1 year of meaningful integration into how you work.
• Strong understanding of software architecture, API design, database modeling, and system performance across the full stack.
• Experience writing clean, well‑tested, maintainable code with a high standard for quality and documentation.
• 2+ years of working in product‑driven engineering environments, with a demonstrable track record of thinking beyond the ticket, understanding user needs, business goals, and product trade‑offs.
• Comfortable operating with a high degree of autonomy and ownership; able to self‑direct, prioritize effectively, and deliver without close supervision.
• Strong communication skills, able to articulate technical…