Software Engineer 2 (Java/Kotlin) – Offer Verification

Allegro.eu S.A.; Warszawa; Hybrid; PLN 163,000 - 232,000; Full time

Benefits offered by this job

MacBook Pro or Dell laptop

Training budget

English classes

Volunteering day

Social events

Job summary

Allegro.eu S.A. Warsaw is seeking a backend engineer with Kotlin/Java experience to design, build, and optimize services handling massive offer events daily.

You will work on Applied AI & ML initiatives, integrating models to analyze images and read offer contexts for automated decisions. You will join the Offer Verification team, collaborating with Data Science and ML groups to ensure platform safety and compliance.

Qualifications

• Commercial experience coding in Kotlin or Java.
• Commitment to high-quality, maintainable code and engineering best practices.
• Experience integrating AI/ML models in production environments.
• Willingness to take on frontend tasks (React/Angular/Vue) when needed.
• Good English communication (B2+).

Responsibilities

• Design, build, and optimize backend services for massive-scale systems.
• Develop and deploy AI/ML use cases to analyze images and read offer context.
• Collaborate with Data Science and ML teams to enable real-time decisions.
• Validate merchant listings against policies and regulations.
• Contribute to Allegro’s tech stack with Kotlin and related tooling.

Skills

Kotlin

Java

Backend development

English communication

Tools

Kubernetes

Docker

Consul

GitHub Actions

Job description

Location: Warszawa, PL, 00-841

Team: Technology

Contract Type: Employee

About the job:

Massive Scale: Design, build, and optimize systems that handle a huge distributed scale of ~120 million offer events daily. You will be working on one of the largest services at Allegro.

Applied AI & Machine Learning: Move beyond simple chatbots. You will work with real AI use cases, integrating ML models and AI agents to analyze images (e.g., detecting counterfeit products and supporting brand protection processes) and read the context of offers to make automated decisions.

Meaningful Business Impact: Build and maintain essential tools that ensure platform safety and compliance. Your work in automating offer and product verification will directly prevent legal and Terms & Conditions breaches and protect users.

Modern Tech Stack: Work primarily in Kotlin to build our backend services. While the backend is our core, having an interest in frontend technologies (like React, Angular, or Vue.js) is a great plus, as we value full-stack capabilities.

Cutting-Edge AI Infrastructure: Be part of the initiative to evaluate and build infrastructure for open-source AI models (open weights) to optimize costs. You will also help develop "AI Evals" to track model performance and prevent regressions at scale.

Join the Offer Verification team! You will have a chance to build tools that validate all merchant listings against the company policies and law regulations. Your team works with the Data Science and Machine Learning teams, utilizing AI to make real-time decisions. High performance, engineering best practices, and a 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 PLN 14 600 - 20 825

Annual bonus based on your annual performance and company results.

Our team is based in Warsaw.

We are looking for people who:

Have commercial experience coding in Kotlin or Java (with an eagerness to master Kotlin for our new services);

Value high-quality code and engineering best practices to solve complex challenges in massive-scale distributed systems;

Are excited to implement and optimize AI models in a production environment;

Embrace a growth mindset, value team stability, and are open to occasionally picking up frontend tasks (React is a nice-to-have);

Communicate effectively in English (at least a 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!

Get to know our team, take a peek at our office life and check out what else we do at Allegro.