Senior Python&Java Developer with Apache Spark Warszawa B2B 1 000 – 1 200 PLN/day

Jit; Polska; Hybrid; PLN 240,000 - 340,000; Full time

Benefits offered by this job

Hybrid work model

International work environment

Training financed by Jit

Scandinavian work culture

Job summary

Jit is seeking a skilled data engineer to work on a hybrid project in Capital Markets, focusing on financial crime prevention. You will contribute to building scalable data pipelines, detection rules, and scoring models within a greenfield platform spanning FX, Equities, Derivatives, and Bonds.

You will collaborate in Agile teams, design robust data processing solutions, and leverage Python, Java, and Spark to deliver high-quality engineering across distributed environments.

Qualifications

• Strong programming skills in Python and Java.
• Advanced experience with Apache Spark (PySpark) and SQL for large-scale data processing.
• Hands-on experience with distributed compute platforms and on‑premise clusters.
• Proficiency with CI/CD tools such as Bamboo/Jenkins, and Bitbucket.
• Experience in Agile teams and ability to work independently in fast-paced environments.
• Strong analytical and problem-solving skills.

Responsibilities

• Design, implement, and optimize data pipelines to support AML/detection scenarios.
• Implement detection logic, rule frameworks, and scoring components for financial-crime use cases.
• Ensure high-quality engineering across code, data pipelines, and operations.
• Contribute to a greenfield architecture with ownership, innovation, and delivery excellence.

Skills

Python

Java

Apache Spark

SQL

Distributed Compute

CI/CD Tools

Agile

Analytical & Problem-Solving

Tools

Apache Spark (PySpark)

SQL

Bamboo/Jenkins

Bitbucket

Job description

Work model: hybrid from Gdynia / Gdańsk / Warszawa (3 days per week from the office)

Why choose this offer?

• You can expect a flexible work organization
• The international work environment will give you the opportunity to interact with the English language on a daily basis
• Scandinavian organizational culture will provide you with work-life balance, you will gain time for additional training (financed by Jit)
• The Jit community will bring you a nice time during regular integration meetings

Project

You will be involved in a financial crime prevention initiative within Capital Markets, focused on building and enhancing transaction monitoring and AML detection solutions. The project includes developing large-scale data processing pipelines, implementing detection rules and scoring models, and contributing to a greenfield platform designed to identify suspicious trading and financial activities across products such as FX, Equities, Derivatives, and Bonds.

Responsibilities you’ll have

• Design, implement, and optimise data pipelines to support end-to-end capital-markets AML detection scenarios
• Implement detection logic, rule frameworks, and scoring components to support financial-crime use cases
• Ensure high-quality engineering across code, data pipelines, and operational processes
• Contribute to a greenfield architecture with a strong sense of ownership, innovation, and delivery excellence

Expected competences and knowledge

• Strong programming skills in Python and Java
• Advanced experience with Apache Spark (PySpark), SQL for large-scale distributed data processing
• Hands-on experience in distributed compute platforms and on-premise cluster environments
• Proficiency with CI/CD tools such as Bamboo/Jenkins, and Bitbucket
• Experience working in Agile teams, with the ability to work independently in fast-paced, evolving environments
• Strong analytical and problem-solving skills with the ability to adapt quickly

Nice to have

• Understanding of Capital Markets products including FX, Equities, Derivatives, and Bonds etc
• Previous experience in Financial Crime, AML, or surveillance use cases
• Experience implementing rule-based detection systems, scorecards, or alerting frameworks
• Experience delivering against NFRs such as performance, scalability, observability, data quality, resiliency, and security
• Experience with automation, including automated pipeline deployment, data validation, testing frameworks, and workflow orchestration
• Experience in integrating the solutions with the third party systems (like case management systems)
• A strong “can-do” attitude and the ability to collaborate effectively in a cross-functional team

Technologies you’ll work with

• Python
• Java
• Apache Spark (PySpark)
• SQL
• Bamboo, Jenkins, Bitbucket
• CI/CD
• Agile

Client – why choose this particular client from the Jit portfolio?

Jit Team has had an over-decade-long relationship with the leading financial group in the Nordic countries, and we are privileged to be our client’s premier partner in Poland. At present, over 200 Jit personnel are engaged in the completion of more than 60 projects for this Norwegian major provider of financial services with a global presence and a strong focus on modern technology. Our customer’s work atmosphere is epitomized by the Scandinavian culture, which is conducive to people who place emphasis on work-life balance and feedback culture. Furthermore, all projects are executed in international teams, giving constant exposure to the English language.

About Jit Team

The Human Factor of IT – it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts, to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams.

Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.

Here’s how we get from first “hello”
to “welcome aboard”

You’ll meet with our HR team to discuss your experience, approach to software development, and teamwork. We’ll also verify your English language proficiency as part of the conversation. Then, you’ll take part in atechnical interview focused on your skills and problem-solving mindset.

We believe agreat workplace is more than aset of benefits. It’s about trust, long-term relationships, and an environment where people can do their best work.

Share and gain experience. Jit Academy is aplatform serving amutual knowledge exchange. Lecture others and share your expertise or join the audience.

Jit Communities

Join the group of experts. We ensure constant growth, that’s why we keep building communities dedicated to mutual education.

Growth support

We value people who are looking to develop their skillset. We proudly finance avariety of courses and certifications so that you can gain new competencies.

Jit Summer Office

Gain access to the office located at the very beach in Chałupy. Jit Trailer awaits visits of the team members and their families.

Jit Boats

Cruise the bay thanks to the motorboat awaiting at the Yacht Park in Gdynia. Furthermore, there is afleet of jet skis and kites located at the beach in Chałupy.

Would you recommend any IT specialist we could hire? Share the contact and gain abonus if we hire them.

Start the day without haste.
At Jit, we begin and finish the day of work within acertain time frame, in stead of fixed hours.

Bonuses for content creators

We provide bonuses to those willing to participate in industry events as public speakers, and to content creators writing articles for our blog.

Mental health support

Mental health is fundamental. Take advantage of psychologists and psychotherapists’ support and reach for psychoeducational content on the wellbeing platform

We provide our teams with high-quality gear necessary to work. Choose between MacOs or Windows and work the way you prefer.

Teambuilding events

Meet new, interesting people. We’re dedicated to building human relations and often host informal events that bound our team members.

Classes conducted for small groups, lectured
by our teachers, guarantee rapid results.

Take care of your wellbeing. Members of Jit Team, gain access to awide range of medical plans provided by Medicover or PZU.

We provide Multisport and Medicover Sport gym cards so that you can improve your physical condition.

Life insurance

Increase your safety. No matter the form of employment, we provide life insurance plans to our colleagues.

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