Junior Full-Stack Engineer (Python / React)

Sigma Software; Warszawa; On-site; PLN 70,000 - 90,000; Full time

Job summary

Sigma Software in Warsaw, Poland, is seeking a Junior Full-Stack Engineer to join a cloud-native platform project. You will contribute to both backend and frontend, develop REST APIs, and work with databases and testing in an Agile, mentor-supported environment.

The role emphasizes modern tech like Kubernetes, cloud infra, and scalable data systems, offering growth and hands-on experience across the stack.

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

Responsibilities

• 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

Skills

Python

SQL (PostgreSQL)

TypeScript

React

REST APIs

Cloud infrastructure

Kubernetes

CI/CD (GitLab CI)

Agile

English communication

Tools

Next.js

Azure AKS

MCP

Job description

• 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.

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

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