Senior Software Engineer (SEO Tech)

About the Team: Chonk Team

The Chonk Team is the technical powerhouse behind Allegro’s SEO business unit. We are a specialized engineering squad (4 Developers, Project Manager, and Leader) responsible for one of the largest traffic entry points on the Polish internet.

We don't just maintain; we innovate. Last year, we launched Allegro Rankings, a product now scaling internationally. Currently, we are embarking on a high-impact mission: building a Market Trend Prediction engine using Large Language Models (LLMs). This is a rare opportunity to shape the architectural foundations of a project that turns AI experiments into production-grade business solutions.

Your main responsibilities:

As a Senior Software Engineer, you will act as a Technical Leader and architect for the SEO business area. You will have the autonomy to drive technical decisions and lead the team through the complete lifecycle of complex products—from initial PoC to petabyte-scale production.

Your main focus areas:

• Engineering Excellence: Leading by example through mentorship, high-quality code reviews, and establishing engineering standards.
• Big Data at Scale: Designing and optimizing systems that handle massive daily request volumes and extract actionable insights from vast datasets.
• AI Integration: Leading the technical integration of LLMs to drive our predictive capabilities.
• Cross-team Orchestration: Collaborating with over a dozen teams (Offer, Product, Listing, Category) to manage complex technical dependencies.

We are looking for people who:

• Tech Stack: You are proficient in Kotlin or Java and have a solid foundation in microservices and cloud environments (GCP/Azure).
• Ownership: You feel comfortable interacting with stakeholders and taking full end-to-end ownership—from requirements to post-deployment monitoring.
• Big Data Ambitions: You want to work with tools like BigQuery and Airflow. Experience with Scala is a significant plus.
• AI Curiosity (Nice to have): Familiarity with LLM tuning (LoRA, PEFT) or frameworks like LangChain/AutoGen will help you lead our newest initiatives.
• Language: You are fluent in Polish (C1) and English (min. B2). Note: As our current workflow is linguistically homogeneous, Polish is a must-have for this role.

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.
• The salary range for this position depending on the skill set is as follows (contract of employment, tax-deductible cost): 18 850 - 25 900 gross
• 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.
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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!