Software Engineer 2 (Java / Kotlin) – Allegro Merchant AI Assistant

Allegro.eu S.A.; Poznań; On-site; PLN 163,000 - 232,000; Full time

Benefits offered by this job

MacBook Pro

Fringe benefits cafeteria plan

English classes

Training budget

Volunteer day

Office in Poznań

Job summary

Allegro.eu S.A. is seeking a Software Engineer 2 (Java/Kotlin) to join the Merchant Experience team in Poznań. You will build robust backend systems for Allegro Merchant AI Assistant, delivering real-time, data-driven support under high user traffic with microservices architecture.

You will work with Spring Boot, Kafka, and AI/ML techniques, including prompt engineering and LLM evaluation. A hybrid work model and English communication at B2 level are expected.

Qualifications

• Proficient in Kotlin or Java with Spring Boot and Kafka.
• Experience with AI/LLM and prompt engineering.
• Frontend knowledge is a plus (React/TypeScript).
• English proficiency at B2 level or higher.

Responsibilities

• Build robust backend systems powering Allegro Merchant AI Assistant.
• Develop scalable microservices for real-time, high-traffic data processing.
• Collaborate with cross-functional teams to shape technical direction.
• Apply AI/ML techniques and evaluate the quality of LLM models in production.

Skills

Kotlin

Java

Spring Boot

Kafka

LLM models

prompt engineering

English (B2)

React

TypeScript

Tools

Kubernetes

Docker

Consul

GitHub

GitHub Actions

Job description

Software Engineer 2 (Java / Kotlin) - Allegro AI Assistant

About the job

In Merchant Experience we holistically handle our Merchant processes. From acquiring new Partners, through their registration, verification and account setup, publication and editing of listings, order management, sale statistics delivery and payment and pricelist management, to API integrations.

Every day, we deal with challenges related to heavy traffic, large data volumes and solution scaling, so as to meet the needs of Partners and the business.

Join the Merchant Experience Team! You will have a chance to build Allegro Merchant AI Assistant – one of the most innovative products on the platform. Your team works closely with other teams, creating the best experience for customers. High performance, engineering best practices and a great atmosphere 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 14 600 - 20 825

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 have experience with Spring Boot and Kafka to build robust backend systems;

Are enthusiastic about AI and want to stay at the forefront of technical innovation;

Want to build impactful tools that power our AI Merchant Assistant, driving the end-to-end development of robust, highly scalable microservices to deliver real-time, data-driven support under high user traffic;

Know how to use LLM models to create agents (automation, conversations), or want to develop in this area;

Know techniques of prompt engineering and how to evaluate the quality of LLM models, or want to develop in this area;

Experience with frontend technologies (React/TypeScript) is a “Nice to have” to help build modern frontend reporting components;

Are excited to join a growing team where they can influence the technical vision and help shape new projects from the ground up within the ecosystem;

Know English at least at 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!

Don’t wait until you join us! Let's meet online!

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