Senior Software Development Engineer

Warsaw - Poland

Monthly Salary: Not Disclosed

Posted on: 4 hours ago

Vacancies: 1 Vacancy

Job Summary

The Financial Gateway team builds the core platform responsible for delivering accurate transparent and timely financial data to internal stakeholders and external clients.

We operate at the heart of the companys financial ecosystem designing reliable data pipelines billing calculation engines and financial data services that power billing systems FP&A intercompany flows and reporting processes.

Our mission is to ensure financial data is: Correct Traceable Scalable Consistently available across systems

This is a data-intensive architecture-driven backend role focused on financial correctness integrations and system reliability not UI or feature CRUD development.

180 zł - 200 zł an hour

What You Will Work On:

You will design and develop systems that:

Collect and store raw financial data from products and partners

Manage contract data and currency rates for billing calculations

Perform billing calculations with full transparency and traceability

Validate monitor and control financial data pipelines

Export billing results to billing and financial systems (FP&A intercompany reporting etc.)

Integrate multiple internal and external services

Improve system performance reliability and data correctness

Work across split infrastructures (ex-IPONWEB and CRTO environments)

Your Responsibilities:

Deliver high-quality features on time

Design scalable solutions considering long-term usage

Participate in design and code reviews

Write clear technical specifications when needed

Troubleshoot complex data and system issues

Monitor performance and reliability of services

Write automated tests (unit functional integration)

Work independently and take ownership of problems

Collaborate with multiple projects and stakeholders

What Were Looking For

This role is ideal for a backend engineer with a strong data and systems mindset especially someone experienced with financial billing reporting or integration-heavy systems.

Required Skills

3 years of backend development experience

Strong Python 3 knowledge (core concepts and internals)

Experience building REST APIs with Django / DRF

Solid experience with PostgreSQL and SQL query optimization

Understanding of data structures algorithms and complexity

Good understanding of HTTP and networking basics

Experience designing features writing documentation and providing estimations

Experience with CI/CD and automation processes

Comfortable working with Unix systems

Knowledge of OOP SOLID principles and design patterns

Passion for writing maintainable tests

Strong problem-solving skills and ability to work independently

Good written English (Russian is a plus)

Nice to Have (Strong Plus):

Experience in fintech billing payments reporting or data platforms

Experience working with data validation reconciliation and monitoring

Experience integrating with external partners/services

Experience debugging production data issues across services

Why This Role Is Interesting:

You will not be building simple APIs.

You will be building the financial backbone that other systems rely on.

This role gives you exposure to:

Financial data architecture

Data correctness and reconciliation challenges

Complex integrations

High-impact backend systems

Cross-team and cross-system engineering

Who Will Succeed Here

Engineers who:

Care about data correctness and system reliability

Enjoy debugging complex data flows

Think in terms of architecture not just endpoints

Take ownership and work independently

Like solving real non-trivial backend problems

What youll love about us:

Independence and freedom to take initiative

Authenticity and transparency

Clear achievable goals

Driven people who are passionate about what they do

A skilled team eager to share their knowledge and learn from you

A focus on quality over quantity in everything we do

About us:

Were MARGO. Founded in Paris in 2005 weve since expanded to two more capitals - London and Warsaw. We specialize in IT outsourcing focusing on complex cutting-edge IT projects. Our success is fueled by strong relationships with ambitious visionary clients who are dedicated to innovation and progress.

At MARGO we believe in people. Thats why we empower our team members with substantial responsibility the freedom to take initiative and endless opportunities for growth. Here everyone plays a role in shaping the companys future. If youre ready to make an impact wed love for you to join us.

We may use artificial intelligence (AI) tools to support parts of the hiring process such as reviewing applications analyzing resumes or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed please contact us.

Required Experience:

Senior IC

The Financial Gateway team builds the core platform responsible for delivering accurate transparent and timely financial data to internal stakeholders and external clients.We operate at the heart of the companys financial ecosystem designing reliable data pipelines billing calculation engines and fi...