Senior Kotlin Backend Engineer

Our vision is simple yet powerful: we want to create a place where engineers thrive, taking on exciting projects and using the latest technologies, free from the shackles of legacy solutions.

Thanks to the diverse range of industries we work with, our days are never boring: from world-class apps to AR solutions or even programming robots, we've got it all covered. We don't just write code for our screens; rather, we develop impactful products used by millions every day: let them be large-scale public transport applications, leading fintech platforms, or storage solutions contributing to a greener future.

We are a team of 100+ engineers (Java, JavaScript, Android, iOS platforms) and QA engineers with our coding fingers at the ready working on the next big thing. We value openness, modesty, hard work, and simple yet great solutions.

We're looking for a
Senior Kotlin Backend Engineer
to help us build a scalable, reliable backend that keeps our systems running smoothly and makes our clients' experience seamless. You'll work closely with L1 and L2 support teams to tackle tricky issues, contribute to a balanced on-call rotation, and provide clear guidance to keep everything running reliably. Along the way, you'll set strong engineering standards, mentor growing developers, and be part of a collaborative team that supports each other's growth - if this sounds like your kind of challenge, we'd love to hear from you.

Your day to day will include:

• Supporting the development of a stable and scalable Kotlin and Spring Boot back-end from the ground up
• Crafting code that adheres to the highest industry standards while ensuring seamless integration with our Cl tools
• Collaborating effectively within a dynamic team environment and engaging in exciting and cutting-edge tech initiatives
• Collaborate closely with our L1 and L2 support teams to efficiently manage escalations - helping identify, troubleshoot, and resolve operational issues that keep our clients running smoothly
• Participate in a rotating on-call schedule to ensure reliable 24/7 client support paired with appropriate compensation for your time and expertise
• Bringing an architectural perspective to the planning process
• Guiding and mentoring junior developers to support their professional growth
• Collaborating with fellow engineers and supporting the work of Tech Leads and Architects

What makes you thrive here:

• 3+ years of hands on Kotlin experience on the backend
• 5+ years of experience in Java ecosystem - you know when to look into the JVM for solutions
• Deep understanding of Spring Boot
• Experience with an observability platform (Grafana / LGTM, or ELK stack, or NewRelic)
• Ability to work under pressure to troubleshoot under times constraints, identifying root causes, suggesting solutions, and following through
• Hands-on experience with SQL or NoSQL databases (Postgres, Redis)
• Experience with Kubernetes
• Familiarity with at least one public cloud provider (preferably AWS)
• Familiarity with IaC, such as Terraform, Helm is a plus
• DevOps mindset of continuous improvement by following processes, sharing knowledge, and learning from feedback
• A strong OOP mindset and a commitment to upholding SOLID principles
• A genuine interest in staying up-to-date with the latest industry trends
• A passion for writing clean, maintainable code, adhering to best practices (if you're a Clean Code/Coder/Architecture fan, you're more than welcome)
• At least an intermediate level of English language skills since our team operates internationally

Why join Supercharge?

• To unleash your full potential, we're here to help you grow every step of the way with exciting international projects, access to inspiring conferences, in-house soft skill trainings, and online courses. We'll even support your English classes, and with our skill matrix, you'll always have a clear path to learn.
• To feel your best, your wellbeing truly matters to us. That's why we offer health coverage with Medicover, Life1 gym access to keep you moving, and extra sick days for those moments you just need a little rest. We celebrate milestones with a fully paid month off after five years, offer extra paternity leave for growing families, and provide support through our Employee Assistance Program.
• To have a blast, you'll join a friendly team of 200+ people, all passionate about building amazing digital products. Whether it's our Summercharge festival, a football match, quiz night, or just grabbing a drink with teammates, there's always something to look forward to. And with our buddy system, you'll feel part of the team from day one.
• To brighten your day, our dog-friendly office in the heart of Budapest is filled with good vibes, great coffee, tasty snacks (yes, including Túró Rudi), and cozy corners to relax, connect, or have a little fun when you need a break. You'll also have a yearly personal budget and a company library to keep your curiosity growing.

About Our Budapest Office
Budapest is where it all started for Supercharge - this is our headquarters and the beating heart of our company. We have local offices in several countries, but this is where the real magic happens. A buzzing, vibrant space filled with talented individuals dreaming up and delivering amazing products for our clients. This Office of the Year award-winning space is home to our legendary after-work events, and as located in the heart of the city, putting us just steps away from some of the best restaurants, cafes, and bars around.