Senior Software Engineer (SEO Tech)

🏢 Summary: Senior backend engineering role focused on designing, optimizing, and operating highly available checkout and purchase-path services at massive scale. The position involves end-to-end ownership of cloud-native microservices, business collaboration, on-call reliability, LLM-based tool development, and mentoring less experienced developers. 🗂️ Requirements: 5+ years building and maintaining complex, highly scalable systems, Java proficiency, Kotlin proficiency, Reactive programming experience, Experience collaborating with Product Managers and analyzing business requirements, Experience cooperating with technical teams, Readiness for structured on-call rotation 📃 Skills: Java, Kotlin, Reactive, GCP, Spring, MongoDB, Microservices, Airflow, Kubernetes, Docker, Consul, GitHub, LLM 🏢 Description: About the job: At Allegro, we operate at a massive scale where performance and reliability are paramount. Within the Razor team, we maintain the critical backend infrastructure for the entire checkout and purchase path. Our service acts as the central hub, providing essential offer data to nearly 60 critical services - including Show Product, Listings, and Cart - across mobile, web, and desktop. Operating on nearly 500 instances and handling traffic of up to 50,000 requests per second, this high-throughput environment demands exceptional focus on high availability, Java performance optimization, and scalable architecture. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 18 850 - 25 900 Annual bonus based on your annual performance and company results. Long term discretionary incentive plan based on Allegro.eu shares (restricted stock units). Our team is based in Toruń. What You'll Do: Massive Scale : Design, build, and optimize systems that handle thousands of requests per second. This is high-availability, high-performance engineering in practice. Master advanced technologies : Work in a world-class, cloud-native environment (GCP). Our core technologies include Java, Kotlin, Spring, MongoDB, microservices, and Airflow (Big Data). True Ownership & Autonomy : We live by the "you build it, you run it" philosophy. You'll join an agile, autonomous team with full ownership of your microservices—from design to deployment. Engage with diverse business initiatives: Partner with PMs to analyze requirements and drive numerous business initiatives across Allegro. Drive innovation with LLM: Participate in the development of new tools based on Large Language Models. Work with an experienced team: Benefit from a high-agency environment with support and development opportunities provided by senior experts. As a senior developer, you will also have the opportunity to share your knowledge and mentor colleagues with less experience. Ensure system reliability: Maintain the stability of complex architectures through participation in on-call duty. We are looking for people with: Commercial experience: 5 years of experience in building and maintaining complex, high-scalability systems. Strong technical foundation: Proficiency in Java (primary) and Kotlin, with a focus on reactive programming. Advanced database skills (nice to have): Hands-on experience and advanced knowledge of MongoDB. Business-oriented mindset: Experience in collaborating with Product Managers and analyzing business requirements. Team collaboration skills: A track record of frequent cooperation with other technical teams to deliver shared goals. Reliability and ownership: Readiness to participate in a structured on-call rotation to ensure system stability. What's in it for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. Annual bonus based on your annual performance and company results. 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 ( see more here ), 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. And that's just the beginning! You can read more about the benefits here . #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!

🏢 Summary: Join a fintech engineering team building high-scale purchase-financing and payment solutions used by millions of customers. The role offers hybrid work, PLN 11,200–15,250 salary on an employment contract, an annual bonus, and modern development tooling. You will develop stable .NET services, learn distributed architecture, and work in a mature microservices environment. 🗂️ Requirements: At least 1 year of .NET software development experience, including internships, English proficiency at B2 level, Willingness to learn distributed-system architecture, Ability to find efficient solutions for user needs, Participation in code reviews and openness to feedback 📃 Skills: .NET, SQL, CosmosDB, Azure, Kubernetes, Docker, Consul, GitHub, Copilot, OpenCode 🏢 Description: About the job: Allegro Pay is Central Europe’s largest and fastest growing fintech – the only place where financial solutions can be created on such a large scale, using state-of-the-art technology. We work on purchase financing and payment methods that are used daily by customers of Allegro, the most popular shopping platform in Poland and one of the largest e-commerce companies in Europe. Due to this scale, we have the opportunity to work on one of the most exciting purchase financing and payment solutions in our country. We are looking for talented people who want to create powerful and stable solutions to support a product with over a dozen million active users. Important things for you: Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN PLN 11 200 - 15 250 Annual bonus based on your annual performance and company results. Our team is based in Kraków Here's why you should join us: AI-Adoption strategy: we invest a lot of effort to upskill our specialists and equip them with the newest AI coding technologies like Copilot or OpenCode. Big Scale: Immerse yourself in the exciting world of Allegro Pay, where your .NET skills will tackle challenges on a large scale. You'll be contributing to financial solutions that affect over 2.5 million people (handling 60+ million requests daily and managing dozens of terabytes of data) Engineering Maturity: Join a culture that mirrors the top tech giants. Our commitment to engineering excellence and maturity puts us on par with industry leaders like FAANG companies. (11 of 12 in Pragmatic Engineer Score) Best-in-Class Expertise: Work alongside the best experts in the field, collaborating to push the boundaries of what's possible in FinTech. Our team includes MVPs and many conference speakers Impactful Products: Imagine this – your work at Allegro Pay contributes to creating products that you, your family, and friends might already use daily. See the direct impact of your efforts on the FinTech landscape (with 120+ deployments per month) We are looking for people who: Have at least one year of experience in .NET as a Software Developer, including internships Are willing to learn how to design distributed system architecture Want to be proud of the code they write but also willing to accept feedback and share their knowledge during code reviews Can search for efficient solutions to meet users’ needs Are eager to continuously develop their skills and expand their knowledge Know English at B2 level The following are also a plus: Knowledge of SQL, CosmosDB, Azure, Event Sourcing and Kubernetes 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 ( see more here ), 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. And that's just the beginning! You can read more about the benefits here . #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!

🏢 Summary: Join an Advertising team to build and operate high-availability backend microservices and ML-serving infrastructure for a large real-time marketplace. The role uses Kotlin, Spring, Kafka, Kubernetes, BigQuery, and Spark to solve distributed-systems, streaming, and algorithmic challenges. It offers hybrid work in Poznań, flexible hours, performance bonus, and extensive development benefits. 🗂️ Requirements: Kotlin or Java programming, Willingness to master Kotlin, High-quality code review practices, Software engineering best-practice knowledge, Ability to solve user requirements effectively, Continuous learning mindset, English at B2 level or higher 📃 Skills: Kotlin, Java, Spring, Kafka, Kubernetes, BigQuery, Spark, Docker, Consul, GitHub, ML 🏢 Description: 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, Kafka, 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. End-to-End ML Systems: Bridge the gap between big data and real-time product impact. You’ll build the infrastructure for serving ML models , using BigQuery and Apache Spark for offline data processing. You’ll integrate these components with our microservices architecture to create the sophisticated advertising system that powers a personalized user experience. Join the Advertising team! You will have a chance to build Allegro Ads - one of the most visible products on the platform. Your team works closely with the Machine Learning team, creating the best experience for customers. High performance, engineering best practices and great atmosphere in the team guaranteed! Important things for you Flexible working hours in the hybrid model (4/1) - working hours start between 7:00 a.m. and 10:00 a.m. We also have 30 days of occasional remote work. The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): PLN 11 200 - 15 250 Annual bonus based on your annual performance and company results. Our team is based in Poznań. We are looking for people who: Code in Kotlin or Java and are eager to master Kotlin by taking part greenfield project Want to be proud of the code they create ; they value high-quality code reviews and engage in substantive discussions on software engineering best practices; Are excited about building new products and want to experience the journey of launching a fresh project within the Allegro ecosystem; Are open to developing soft skills and embracing a growth mindset through active participation in code reviews, pair programming, and team retrospectives.; Are open to incorporating AI coding assistants into their daily work to maximize efficiency and focus on complex problem-solving 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. 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 ( see more here ), 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. And that's just the beginning! You can read more about the benefits here . #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!