We are looking for people who have:

At least 2 years of commercial experience in software engineering, with a solid foundation in backend development
Strong backend skills (this will be the core of our technical assessment) and a readiness to work with Kotlin and the JVM ecosystem
A genuine passion for mobile apps and a strong commitment to learn and work with native mobile technologies (iOS/UIKit/SwiftUI or Android/Jetpack Compose)
An open mind, flexibility, and a hunger for learning - we value fresh perspectives and the drive to adapt to a transforming environment
A proactive approach to problem-solving and the ambition to take end-to-end ownership of functionalities delivered to mobile apps
Fluency in Polish (at least B2 level).

Nice to have:

Previous commercial exposure to mobile technologies (iOS or Android) is a massive win
A future-proof mindset, ready to pivot and adapt as our team's structure and tech stack evolve
Excitement for working with AI-native capabilities and modernizing high-traffic services

About the job:

We are seeking a talented, open-minded, and ambitious Junior Software Engineer (Backend / Mobile) to join our Listings (Mobile Apps) team. You won't just be writing code for the sake of it; you'll be a key contributor to the critical path of our iOS and Android apps, directly impacting millions of users through our Listings and Filters features. The team is currently driving a massive transformation, migrating our backend services to Kotlin and JVM, while building a next-generation shopping experience that will adapt the UI to users’ needs and use cutting-edge technologies (e.g. LLMs) to refine their search results and help them select the perfect product on our shopping platform.

Your mission? To accelerate experimentation and deployment in our mobile apps by combining strong backend capabilities with a passion for mobile development. You’ll get a unique opportunity to dive deep into Kotlin, Spring Boot 4, and Spring GraphQL by providing data and building application UI on the backend, while dedicating a significant part of your time to mastering mobile technologies (Android and/or iOS). Our team is highly experienced, and we are looking for someone who brings fresh ideas, a hunger to learn, and the flexibility to adapt to a changing tech landscape. If you're itching to take end-to-end ownership of features and want to tie your professional future to the dynamic world of mobile app development, you've found the right place.

What's in it for you:

Well-located offices (with e.g. fully equipped kitchens, bicycle parking, terraces full of greenery) and excellent work tools (e.g., raised desks, ergonomic chairs, interactive conference rooms)
A 16" or 14" MacBook Pro or corresponding Dell with Windows (if you don't like Macs) and all the necessary accessories
A wide selection of fringe benefits in a cafeteria plan - you choose what you like (e.g., medical, sports or lunch packages, insurance, purchase vouchers)
English classes that we pay for related to the specific nature of your job.
A training budget, inter-team tourism , hackathons, and an internal learning platform where you will find multiple trainings
An additional day off for volunteering, which you can use alone, with a team, or with a larger group of people connected by a common goal.
Social events for Allegro people - Spin Kilometers, Family Day, Fat Thursday, Advent of Code, and many other occasions we enjoy

#goodtobehere means that:

You will join a team you can count on - we work with top-class specialists who have knowledge- and experience-sharing in their DNA.
You will love our level of autonomy in team organization, the space for continuous development, and the opportunity to try new things. You get to choose which technology solves the problem and you are responsible for what you create.
You will value our Developer Experience and the full platform of tools and technologies that make creating software easier. We rely on an internal ecosystem based on self-service and widely used tools such as Kubernetes, Docker, Consul, GitHub, and GitHub Actions. Thanks to this, you can contribute to Allegro from your very first days on the job.
You will be equipped with modern AI tools to automate repetitive tasks, allowing you to focus on developing new services and refining existing ones (also leveraging AI support).
You will create solutions that will be used (and loved!) by your friends, family and millions of our customers.
You will meet the Allegro Scale , which starts with over 1000 microservices, an open-source data bus (Hermes) with 300K+ rps, a Service Mesh with 1M+ rps, tens of petabytes of data, and production-used machine learning.
You will become part of Allegro Tech - We speak at industry conferences, cooperate with tech communities, run our own blog (it's been over 10 years!), record podcasts, lead guilds, and we organize our own internal conference - the Allegro Tech Meeting. We create solutions we love (and can) to talk about!

Send us your CV and… see you at Allegro

,[] Requirements: Kotlin, JVM, Android, iOS, UIKit, SwiftUI, Android Jetpack Compose Additionally: Sport subscription, Training budget, Private healthcare, Lunch card, Small teams, Flat structure, International projects, Free coffee, In-house trainings, In-house hack days, Modern office, No dress code, Bike parking, Shower, Gym, Playroom, Free beverages, Mobile phone, Free parking, Kindergarten, Startup atmosphere.

Software Engineer 1 (Backend / Mobile) - Listings (Mobile Apps)

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