Developer (Card Payment Systems)

Warsaw - Poland

Monthly Salary: Not Disclosed

Posted on: 16 hours ago

Vacancies: 1 Vacancy

Job Summary

About the role

We are looking for a Developer to join a team responsible for developing and maintaining core card payment systems - from transaction authorization and settlement to integrations with external payment services.

The systems process hundreds of thousands of transactions daily so performance availability and security are key priorities.

Work model: Remote-first with scheduled on-site team meetings (2 days per month in Warsaw).

Responsibilities

- Develop and applications in card payment domain

- Design and implement new functionalities according to business and regulatory requirements

- Integrate systems with external services (REST SOAP messaging queues)

- Optimize performance availability and security of applications

- Cooperate with Analysts Architects and QA in Agile/Scrum teams

- Participate in SIT/UAT testing code reviews and preparation of technical documentation

Required skills

- Commercial experience with C# (Framework / Core)

- Experience with Core Angular and WebAPI

- Knowledge of Entity Framework LINQ Dapper

- Experience with SQL Server (T-SQL) and query optimization

- Knowledge of SOLID principles and design patterns

- Experience writing unit tests (xUnit / NUnit)

- Experience with system integrations (REST SOAP JSON XML)

- Experience working in Agile environment

- Knowledge of Git CI/CD and TeamCity

Language requirements

- Polish: native or C2 level (required)

- English: professional level enabling work with technical documentation

Nice to have

- Experience in card payments / payment processing domain

- Knowledge of Docker / Kubernetes

- Experience working on high-availability or complex distributed systems

100 zł - 110 zł an hour

Margo Offers:

- B2B cooperation

- Remote working model

- Benefits such as medical care and sports card

- Co-financing trainings certification exams and post-graduate studies

- Ability to work in an international consulting company on ambitious projects

- Possibility to get involved in outside-project activities with additional remuneration)

- Excellent working atmosphere integration events

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:

About the roleWe are looking for a Developer to join a team responsible for developing and maintaining core card payment systems - from transaction authorization and settlement to integrations with external payment services.The systems process hundreds of thousands of transactions daily so performa...