Senior Engineer: AI-Driven Code Modernisation

B2B Network; Gdynia; On-site; PLN 120,000 - 180,000; Full time

Job summary

B2B Network is seeking an engineer to join the team building a Tech Modernisation Framework. You will design and improve agent workflows, prompts and tooling to migrate legacy code onto modern stacks. You will connect migrations to the CI/CD and deployment platform (Tekton, ArgoCD, Ansible).

The role blends software engineering, platform automation and applied AI. You will work hands-on with Claude Code and the Maister project, using various LLM providers.

Qualifications

• Proven Python development experience.
• Solid software engineering basics: Git, code review, testing.
• Working knowledge of CI/CD concepts and containerised environments (Docker, Kubernetes basics).
• Hands-on experience with, or strong interest in, LLMs and AI-assisted development (prompting, agents, tool use).
• Able to read and understand code in several languages, including legacy code (e.g. Java).
• Analytical, structured approach to problem-solving, comfortable with ambiguity and experimentation.
• Good communication skills in English and a collaborative attitude.

Responsibilities

• Design and improve agent workflows, prompts and tooling for migrations.
• Connect migrations to CI/CD and deployment platforms (Tekton, ArgoCD, Ansible).
• Work hands-on with agentic coding tools and AI-assisted development.
• Collaborate with application teams to turn real migration cases into repeatable automation.

Skills

Python

Git

CI/CD

Docker

Kubernetes

LLMs / AI-assisted development

Legacy code reading (Java)

English communication

Tools

Claude Code

Tekton

ArgoCD

Ansible

Job description

B2B Network is seeking an engineer to join the team building a Tech Modernisation Framework. You will design and improve agent workflows, prompts and tooling to migrate legacy code onto modern stacks. You will connect migrations to the CI/CD and deployment platform (Tekton, ArgoCD, Ansible).

The role blends software engineering, platform automation and applied AI. You will work hands-on with Claude Code and the Maister project, using various LLM providers.