About the job Massive Scale: Design, build, and optimize systems that handle thousands of requests per minute. This is high-availability, high-performance engineering in practice.Modern Tech Stack: Work with a world-class, cloud-native environment. Our core technologies include Kotlin, Spring, MongoDb, Hermes and Kubernetes. We're not shy when it comes to ML too :) True Ownership & Autonomy: We live by a 'you build it, you run it' philosophy. You'll join an agile, autonomous team with full ownership of your microservices, from design to deployment.Complex Challenges: From distributed systems and data streaming to algorithmic optimization, you'll tackle the complex backend problems that power a massive, real-time marketplace. In our domain, we focus on solutions centered around the Product Catalogue (especially descriptions) allowing our partners to easily list offers with data provided by Allegro. We also deliver a set of tools for well-known brands, enabling them to manage product data directly in our catalog. We approach quality with particular diligence to ensure our stability and scalability. We work in cross-functional teams where various technologies collaborate closely to deliver the highest quality solutions to our users. Our team consists of backend and frontend engineers with support of project managers, UX-designers and data scientists.Important things for you Flexible working hours in an office first model (4/1) that depend on you and your team. Starting later or finishing earlier? No problem! Work hours keep pace with our lifestyles and can start between 7 a.m. and 10 a.m.The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost):PLN 18 400 - 25 450Annual bonus (depending on your annual assessment and the company's results)Long-term discretionary incentive plan based on Allegro.eu sharesOur team is based in Toruń.We are looking for people who Code in Kotlin or Java;Understand Microservices architecture in practice with SpringBootAre experienced in working with document databases like MongoDBExpect work that has a deeper meaning (not only tasks 'management has commissioned') and want to enjoy its results;Want to be proud of the code they create. They eagerly accept comments and share knowledge during code reviews;Can look for effective solutions to the requirements set by users;Want to constantly develop and update their knowledge;Know English at at least B2 level.Have experience working with Elastic Search (nice to have)What we offer Well-located offices (with fully equipped kitchens and bicycle parking facilities) and excellent working tools (height-adjustable desks, interactive conference rooms)A wide selection of varied 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 jobMacbook Pro / Air (depending on the role) or Dell with Windows (if you don't like Macs) and other gadgets that you may needWorking in a team you can always count on — we have on board top-class specialists and experts in their areas of expertiseA high degree of autonomy in terms of organizing your team’s work; we encourage you to develop continuously and try out new thingsHackathons, team tourism, training budget and an internal educational platform (including training courses on work organization, means of communications, motivation to work and various technologies and subject-matter issues)If you want to learn more, check it outWhy is it worth working with us We use the following programming languages/technologies: Java (at least 17), Kotlin (in some teams we also use Python), SpringBoot, Docker, Kafka, MongoDB, CouchbaseThe IT team is made up of over 1700 members who have shared their knowledge at multiple conferences, such as DevDays or Devoxx, and co-create a blog: allegro.techMicroservices – a few thousand microservices and 1.8m+ rps on our business data busBig Data – several petabytes of data and Machine Learning used in productionWe practice Code Review, Continuous Integration, Scrum/Kanban, Domain Driven Design, Test Driven Development, Pair Programming, depending on the teamOur internal ecosystem is based on self-service and widely used tools, such as Kubernetes, Docker, Consul, GitHub or GitHub Actions. This will allow you, from day one, to develop software using any language, architecture and scale, restricted only by your creativity and imagination. To match the scale, we also focus on building entire Platforms of tools and technologies that accelerate and facilitate day-to-day development, and we ensure the best Developer Experience to our teamsTechnological autonomy: you get to choose which technology solves the problem at hand (no need for management’s consent). You are responsible for what you createOur deployment environment combines private Data Centers (tens of thousands of servers) and Public Clouds (Google Cloud and Microsoft Azure)Over 100 original open source projects and a few thousand stars on githubWe organize Allegro Tech Live event, a 100% remote version of our offline Allegro Tech Talks meetups, and we make guest appearances at the invitation of such communities as Warsaw AI, JUG (Poznań, Łódź, Lublin, Wrocław), WG .Net, Dare IT, Women in Tech SummitWe focus on development as well. We organize hackathons and internal conferences (e.g. the annual Allegro Tech Meeting), our employees regularly participate in events both in Poland and abroad (Europe and USA), and each team has its own budget for training and study aids. If you want to keep growing and share your knowledge, we will always support you. This may also be of interest to you: Allegro Tech Podcast → https://podcast.allegro.tech/Booklet → https://jobs.allegro.eu/pl/obszary-prac/tech-data/ Send in your CV and see why it is #goodtobehere!