Junior Full-Stack Engineer (Python / React)

Posted 4 Days Ago
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Hiring Remotely in Warsaw, Warszawa, Masovian, POL
In-Office or Remote
Junior
Software
The Role
Develop and maintain front-end and back-end components for a cloud-native product information platform. Build REST APIs, integrations, database functionality, and data-processing logic using Python, React, and related technologies. Write tests, participate in code reviews and Agile ceremonies, support documentation, and collaborate with international engineering and business teams while developing skills through mentorship.
Summary Generated by Built In
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

    Skills Required

    • 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
    • Experience with Next.js
    • Experience with Microsoft Azure, especially AKS
    • Familiarity with MCP and RAG-based systems
    • Mathematical background
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    The Company
    HQ: New York, New York
    1,516 Employees

    What We Do

    Sigma Software Group, an award-winning and trusted IT partner, has been serving customers for over 21 years, providing comprehensive IT solutions to various businesses, ranging from startups to established software product houses. As one of Europe's substantial IT consultancies, it brings together a dedicated workforce of over 2,100 professionals in 40 offices across 19 countries. With a diverse client base, including more than 300 enterprises, including Fortune 500 stalwarts, Sigma Software Group is a preferred choice for developing solutions that help businesses create cutting-edge products while meeting their unique needs. Sigma Software Group operates as a dynamic ecosystem of tech companies, offering 25 ready-to-implement innovative products and 40+ value-added services. Furthermore, Sigma Software Group is committed to fostering innovation through initiatives such as the Sigma Software Labs business incubator, Sigma Software University, the SID Venture Partners VC Fund, UA Tech Network, Techosystem, the European Business Association, and other collaborative efforts. Since 2015, Sigma Software Group has consistently earned recognition on the IAOP's prestigious World's Top 100 Outsourcing list. The company's accomplishments have also been acknowledged by prominent global media outlets such as Forbes, CNBC, The Times, and Reuters

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