Senior Backend Engineer (Java/Kotlin)

Reposted 11 Days Ago
Be an Early Applicant
Szeged, Szegedi járás, Csongrád-Csanád, HUN
Hybrid
Senior level
Information Technology • Consulting
The Role
Build and maintain a scalable Kotlin/Spring Boot backend, run on-call rotations, collaborate with support teams to resolve escalations, contribute to architecture, uphold engineering standards, and mentor junior developers.
Summary Generated by Built In
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, NodeJS and dotnet 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 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
  • Collaborate closely with our Customer Support (L1) and Infrastructure Support (L2) 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
  • Crafting code that adheres to the highest industry standards while ensuring seamless integration with our Cl tools
  • Collaborating effectively within a dynamic team environment on exciting, cutting-edge tech initiatives while working closely with fellow engineers and supporting Tech Leads and Architects
  • Bringing an architectural perspective to the planning process
  • Guiding and mentoring junior developers to support their professional growth

What makes you thrive here:

  • 5+ years of experience in Java ecosystem, familiarity with Java 17, 21
  • Deep understanding of Spring Boot
  • Experience with an observability platform (Grafana / LGTM or ELK stack or NewRelic)
  • Proven ability to troubleshoot under pressure, quickly identify root causes, recommend impactful solutions, and ensure thorough follow-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)
  • Kotlin experience is a huge plus, as this is our choice of language on the JDK
  • 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 Medicare 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 Szeged 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 Szeged office

After focusing on our International expansion for years, we felt that it was time to think locally and open a second office in Hungary, in the vibrant city of Szeged. With its bustling tech and social scene, stunning architecture, and laid-back atmosphere, the city has all that a true Supercharger needs. We are here to create a place where IT professionals can thrive, find international challenges, opportunities to grow, and amazing company culture.

Skills Required

  • 5+ years of experience in the Java ecosystem (familiarity with Java 17, 21)
  • Deep understanding of Spring Boot
  • Experience with an observability platform (Grafana, LGTM, ELK stack, or NewRelic)
  • Proven ability to troubleshoot under pressure and identify root causes
  • 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 and Helm
  • DevOps mindset and continuous improvement practices
  • Strong OOP mindset and commitment to SOLID principles
  • Passion for writing clean, maintainable code
  • Kotlin experience
  • Intermediate English language skills
  • Willingness to participate in a rotating on-call schedule
  • Experience collaborating with L1/L2 support to manage escalations
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The Company
London, England
231 Employees
Year Founded: 2010

What We Do

At Supercharge, we are your innovation partner to turn disruption into opportunity. We are a next-generation product innovation agency driving growth, efficiency, and resiliency for our partners. We create smart product strategies, design delightful interfaces and build robust, AI-driven software to turn some of the most challenging digital initiatives of our partners into success stories. Our in-house team of over 200 digital experts across our European and North American offices are passionately united in the pursuit of discovering and building better futures. We cut through business, tech, and regulatory complexity and fuse behavior science-based design and unique data & AI-focused technical competence to propel your business. We believe that innovation is a team effort: our strategists, designers, developers, and engineers work shoulder to shoulder to enable what yesterday was still impossible. Supercharge has been one of the fastest-growing tech companies in Europe according to Financial Times (FT1000) and Deloitte (Fast50) for two years running. Having delivered over 250 digital products for our partners internationally, we are pioneers in redefining, diversifying, and protecting businesses to achieve long-term success. Products delivered by our team stretch from major mobile banks to solutions powering successful startups. By working with us, you will find yourself among leading companies like Ericsson, Vodafone, Santander, Metlife, Unilever, Delivery Hero, or Pfizer. Let’s talk about your future as a digital leader! Reach out now

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