Senior Python Developer Gdańsk, Gdynia, Warszawa B2B 1 000 – 1 200 PLN/day

Jit; Polska; Hybrid; PLN 180,000 - 280,000; Full time

Job summary

Jit seeks an experienced engineer to drive AI-powered legacy code modernization. You will design agent workflows, build automated analysis and migration tooling, and implement Python-based solutions with clean code practices.

The role integrates AI-driven workflows with CI/CD platforms like Tekton and ArgoCD, operating in Docker/Kubernetes environments. You will work with LLMs, prompt engineering and agentic tooling to transform codebases, collaborating with enterprise teams to create repeatable

Qualifications

• Strong programming in Python.
• Solid understanding of software engineering principles (Git, code reviews, testing, clean code).
• Practical knowledge of CI/CD and containerisation (Docker, Kubernetes).
• Hands-on experience with LLMs, prompt engineering, AI-assisted development.
• Knowledge of agentic AI concepts (agents, tool use, agent workflows).
• Ability to read/understand code in multiple languages including legacy Java.
• Experience with Tekton or ArgoCD; knowledge of Ansible or IaC tools.
• Familiarity with agentic coding tools and MCP.

Responsibilities

• Design, develop and improve AI-powered agent workflows for legacy code modernisation.
• Build tooling for automated code analysis, migration and refactoring.
• Develop Python-based solutions following clean, maintainable software practices.
• Integrate AI workflows with CI/CD and deployment platforms such as Tekton, ArgoCD and Ansible.
• Work with LLMs and agentic coding tools to support migrations.
• Analyse legacy codebases and transform them into modern stacks in collaboration with teams.
• Collaborate with enterprise teams to turn migration cases into repeatable automation.
• Experiment with different LLM providers and models in a vendor-agnostic setup.
• Work in containerised environments using Docker and Kubernetes.

Skills

Python

LLMs

Agentic AI concepts

CI/CD

GitOps

Tools

Docker

Kubernetes

Tekton

ArgoCD

Ansible

Git

Java

Spring

Job description

Work model: hybrid from Gdynia / Gdańsk / Warszawa (2/3 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 project focused on modernising legacy applications through AI-driven code migration and automation. The project aims to analyse existing codebases and transform them into modern, platform-approved technology stacks using agentic AI workflows, while integrating the process with CI/CD and deployment platforms.

Responsibilities you’ll have

Design, develop and improve AI-powered agent workflows for legacy code modernisation

Build and maintain tooling for automated code analysis, migration and refactoring

Develop solutions in Python following clean, maintainable software engineering practices

Integrate AI-driven workflows with CI/CD and deployment platforms such as Tekton, ArgoCD and Ansible

Work with LLMs, prompting, agentic coding tools and tool-use workflows

Analyse legacy codebases and help transform them into modern, platform-approved technology stacks

Collaborate with application teams to turn real migration cases into reliable and repeatable automation

Experiment with different LLM providers, models and approaches in a vendor-agnostic environment

Contribute to testing, evaluation and continuous improvement of AI-generated migrations

Work with containerised environments using Docker and Kubernetes

Expected competences and knowledge

Strong programming skills in Python

Solid understanding of software engineering principles, including Git, code review, testing and clean code

Practical knowledge of CI/CD and containerisation, with Docker and Kubernetes

Hands-on experience with or strong interest in LLMs, prompt engineering and AI-assisted development

Understanding of agentic AI concepts, including agents, tool use and agent workflows

Ability to read and understand code written in different programming languages, including legacy technologies such as Java

Experience with CI/CD and GitOps tools such as Tekton or ArgoCD

Knowledge of Ansible or other Infrastructure as Code tools

Familiarity with agentic coding tools such as Claude Code or similar solutions

Knowledge of LLM evaluation, context engineering or Model Context Protocol (MCP)

Experience with legacy modernisation, code migration or large-scale refactoring is a strong advantage

Familiarity with Java/Spring, frontend technologies or other modern target stacks is a plus

Experience working in enterprise or regulated environments, preferably banking

Strong analytical and problem-solving skills, with a structured approach to experimentation

Good communication skills in English and ability to work effectively in a collaborative team

Technologies you’ll work with

Python

LLMs

MCP

Tekton

ArgoCD

Ansible

Docker

Git

Java

Spring

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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