Software Engineer 1 (.NET) – Core System

Allegro.eu S.A.; Warszawa; Hybrid; PLN 125,000 - 170,000; Full time

Benefits offered by this job

Modern offices

MacBook Pro or equivalent

Fringe benefits

English classes

Training budget

Volunteer day

Team events

Job summary

Allegro Pay is seeking a Software Engineer 1 (.NET) to join the Core System team in Warsaw. You will enhance a critical financial platform, focusing on performance and reliability while delivering new capabilities and maintaining a high-quality codebase.

Collaborate with internal stakeholders in Accounting and Controlling to align technical work with business needs. The role requires .NET backend experience, strong PostgreSQL skills, and openness to AI-assisted development.

Qualifications

• Experience with backend services in .NET and scalable data handling.
• Strong SQL skills with PostgreSQL and data modeling.
• Willingness to work with AI tools to optimize development tasks.

Responsibilities

• Improve performance, scalability, and reliability of core financial systems.
• Collaborate with Accounting and Controlling to translate business needs into solutions.
• Deliver new capabilities and maintain high code quality.

Skills

.NET backend development

SQL databases

PostgreSQL

AI tools

GitHub Copilot

Tools

GitHub Copilot

Job description

Software Engineer 1 (.NET) - Core System

Location: Warszawa, PL, 00-841

Team: Technology

Contract Type: Employee

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.

The role

We are looking for a Software Engineer with a solid foundation in .NET and backend development to join a team responsible for our core financial system - the absolute source of truth for customer and loan data. Your focus will be on improving system performance, scalability, and reliability, while designing and delivering new capabilities and continuously raising the quality and maintainability of the codebase. You will also work closely with internal business stakeholders, such as Accounting and Controlling teams, to understand their needs and translate them into robust technical solutions.

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 Warsaw.

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 experience in .NET backend development

Have practical experience working with SQL databases, specifically PostgreSQL

Are eager to understand the broader business context and communicate effectively with internal clients

Demonstrate a high sense of responsibility and resilience, as you will be working with critical financial data

Are open to actively utilizing AI tools (such as GitHub Copilot) to optimize their daily coding tasks

Value independence and are ready to take ownership of the features they deliver from start to finish

Are committed to continuous learning, open to constructive feedback, and willing to continuously improve their skills and ways of working

Collaborate effectively within a team, share knowledge, and contribute to a supportive engineering culture

Speak fluent Polish (essential for daily communication with business stakeholders) and communicative English (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 .

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.