Full Stack Product Engineer at Lumen Dynamics

Full Stack Product Engineer About Lumen Dynamics We're shipping products that people need to build financial freedom in their lives. Whether that's getting out of crippling debt or building an investment portfolio that ensures their future is secure, our aim is to ensure people have the tools and knowledge they need to succeed. We started with a platform used by financial advisors, to make the financial advice process more transparent and have their clients (everyday people) be more involved in understanding and building financial plans they believed in and could make sense of, putting people in greater control of their finances. Next up, we're working on bringing a complete Financial Freedom Programme™ to companies to help their employees systematically and proactively work towards improving their financial health. We're focused on simplifying finances to make a real impact. What we care about Authenticity: What you see is what you get. We value each member of the team showing up authentically, and make space for others to do the same. User focus: We build real products for real people. We focus on solving problems for them that make meaningful and lasting impact. Curiosity: We embrace curiosity, challenge the status quo, and see setbacks as opportunities to learn. Simplicity: We believe that making things more complex is easy, making things simple is hard. So we do what's hard. From concepts, features, products — if it's not simple then it's most likely going to be hard to follow or use. Neither of which is good for users. Craft: We care about the quality of what we build and how we build it. Good engineering isn't accidental — it comes from people who take pride in writing clean, thoughtful code and who genuinely enjoy getting better at what they do. Proactive Ownership: You own your features, tools, and processes. If you see something that needs improvement, push for it to get done. Autonomy: Everyone in the team is responsible for how they deliver their work, what solutions they choose, and what they decide to prioritize. Who we're looking for We're looking for a Full Stack Product Engineer to join our small, autonomous product team. This is a general engineering role, you won't be siloed into one product. You'll work across our backend systems and our mobile applications, moving between them as the work demands. Some weeks that's deep backend work, other weeks you're shipping features in the mobile app. The variety is real, and we need someone who's energised by that, not intimidated by it. This role is ideal for someone with 5+ years of experience who wants genuine ownership over their work, not just tickets to close. What you'll be doing Working across the full stack: You'll move between our core backend (a Rails monolith that powers everything) and our mobile application built with Expo/React Native, along with other smaller JavaScript-based projects. You're not expected to be an expert in all of these on day one, but you should be comfortable operating across layers and picking things up quickly. Owning your work end-to-end: You'll take features from idea through to delivery. That means understanding the problem, shaping the approach, building it, and making sure it actually works for users. You'll work with product managers and designers, but you're expected to have opinions and drive your own work forward. Designing and building APIs: A lot of our systems talk to each other. You'll design, build, and maintain the integrations that connect them cleanly and reliably. Keeping things visible: We're a remote team and we work autonomously, but that only works when people communicate well. You'll write pitches, document your decisions, share progress, flag blockers, and keep the rest of the team aligned. Not documentation for the sake of it; documentation as a way of thinking clearly and working well together. Supporting users when needed: You won't be on a dedicated support rotation, but you'll pitch in from time to time. Understanding how users experience what you build keeps you grounded. Product thinking: You won’t just take tickets and ship, but shape the thinking and direction of what you’re building. What success looks like in this role Features ship and they work well: You consistently deliver quality work, well-built, tested, and thoughtful. Not just functional, but something you're proud of. The backend stays healthy: You contribute to keeping our core systems clean, performant, and scalable as the product grows. You leave things better than you found them. The mobile app moves forward: You help push our mobile product forward with solid, reliable feature work that users can feel. You're a trusted teammate: People know where your work stands. You communicate clearly, you're proactive about problems, and you're someone the team can rely on. Requirements Experience: 5+ years of professional experience in full-stack development, with a track record of shipping and maintaining real products. We're hir