Junior Full-Stack Engineer (Python / React)

Location: Warsaw, Masovian Voivodeship, pl Department: BU001 (o6pBm) Employment Type: {'id': 'permanent', 'label': 'Full-time'}

Company Description

Join a team developing a large-scale cloud-native platform for a leading telecommunications company serving millions of users worldwide. We are looking for a Junior Full-Stack Engineer with strong Python skills and practical experience with React who is eager to grow in a modern engineering environment.

You will contribute to a data-intensive product focused on APIs, integrations, and scalable distributed systems while collaborating with international teams in an Agile setup. We at Sigma Software create opportunities for engineers to work with modern technologies, gain mentorship from experienced specialists, and build solutions used in global markets.

This role offers hands-on experience with cloud infrastructure, Kubernetes, modern Front-end and Back-end technologies, and enterprise-scale architecture in a supportive and growth-oriented environment.

CUSTOMER

Our Customer is a leading Swedish telecommunications company delivering innovative technology solutions across complex infrastructure environments. Operating internationally and serving millions of users, the company focuses on scalable digital ecosystems, cloud-native transformation, and reliable integration between distributed systems.

PROJECT

The project is a Product Information Service — a scalable cloud-native platform designed to manage product-related data and support integration across multiple enterprise systems. The solution enables efficient data management, API development, and seamless interoperability between platforms while ensuring reliability and scalability for large volumes of information.

The team develops both Front-end and Back-end components of a modern web-based application and follows Agile practices with close collaboration across engineering and business teams.

Key Technologies: Python, React, TypeScript, PostgreSQL, Kubernetes, GitLab CI, Microsoft Azure, REST APIs

Job Description

Contribute to the development and maintenance of Back-end and Front-end components of a data-intensive platform

Assist in designing and implementing REST APIs and integrations with internal systems

Develop and maintain database-related functionality and data processing logic

Write and maintain unit and integration tests

Participate in code reviews and improve coding practices based on feedback

Collaborate with developers, QA engineers, and stakeholders in an Agile environment

Participate in sprint planning, backlog grooming, estimations, and other Agile ceremonies

Support technical documentation and knowledge-sharing activities

Continuously improve technical skills with mentorship from senior engineers

Qualifications

2+ years of professional software development experience with Python

Experience working with SQL databases, preferably PostgreSQL

Working knowledge of TypeScript and React

Understanding of REST APIs and web application architecture

Basic understanding of cloud infrastructure and application deployment

Familiarity with Kubernetes and containerized applications

Basic knowledge of CI/CD practices and tools such as GitLab CI

Experience working in Agile development environments

Strong problem-solving and communication skills

Intermediate or higher English level

WILL BE A PLUS

Experience with Next.js

Experience with Microsoft Azure, especially AKS

Familiarity with MCP and RAG-based systems

Mathematical background

Additional Information

PERSONAL PROFILE

Eager to learn and develop within a collaborative engineering team

Responsible and proactive in daily work

Strong attention to detail and code quality

Good communication and teamwork skills

Open to feedback and continuous improvement