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Sigma IT Poland

Back-end Developer

Sigma IT Poland
Poland · Full-time · Mid-Senior
Holisticon Connect is a division within NEXER GROUP - a custom software development company. We started in Poland in 2017 and are now a team of over 140 people. We have the opportunity to work with world-renowned brands from Scandinavia, the UK, and Western Europe. Our goal is to grow stronger, in competence rather than in numbers. If you like what we do, check out our offer, maybe we will have the pleasure of meeting you! 😊

We are looking for a Backend Developer to join an international product team building a large-scale internal system used daily across multiple markets. The product plays a key role in an ongoing digital transformation and is built as a set of scalable, event-driven microservices running in a cloud environment. You will work in a cross-functional team with Frontend Developers, UX Designers, and a Product Owner, contributing to backend services that require high reliability, performance, and clean architecture.

We Offer a Competitive Renumeration

  • B2B: 110 – 145 PLN net/hour + VAT

Key Responsibilities

  • Design, develop, and maintain backend services using Kotlin and Spring Boot;
  • Build and evolve microservices with asynchronous communication patterns;
  • Implement and integrate event-driven solutions using Apache Kafka;
  • Work with relational databases, primarily PostgreSQL, ensuring data consistency and performance;
  • Develop and consume REST APIs used by frontend and other services;
  • Write unit, integration, and end-to-end tests within the Kotlin ecosystem;
  • Deploy and operate services in a cloud-native environment (AWS, Kubernetes);
  • Participate in code reviews and contribute to backend standards and best practices;
  • Use AI tools responsibly to improve development efficiency and code quality.

You might be the perfect match if you are / have:

  • At least 5 years of experience working as a Backend Developer;
  • Excellent knowledge of Kotlin and Spring Boot, with a solid understanding of SQL (PostgreSQL preferred);
  • Very good command of English (C1), both written and spoken;
  • Hands-on experience designing services in a microservices architecture;
  • Experience working with Apache Kafka and asynchronous communication;
  • Ability to work in a cloud environment, including AWS and Kubernetes;
  • Practical experience with Git and building REST APIs;
  • Understanding of system design fundamentals in distributed systems;
  • Experience writing unit, integration, and end-to-end tests in the Kotlin ecosystem;
  • A strong focus on clean, maintainable, and readable code;
  • A proactive, communicative team player with an open and collaborative mindset;
  • Based in Poland, with availability for occasional in-person team meetings.

Moreover, We Appreciate Skills In These Areas

  • Experience with Kubernetes and container orchestration;
  • Hands-on experience with cloud platforms, especially AWS;
  • Familiarity with event-driven and message-based architectures;
  • Experience working on large-scale or enterprise-level systems;
  • Willingness to take ownership and influence technical decisions.

By Joining Us, You Gain The Following

  • Opportunity to work on exciting, international projects in cutting-edge industries like Automotive, Biotech, IoT;
  • Possibility to develop in cloud technologies;
  • Becoming part of a team that believes that the next step to a promising future is to put your heart into it and make it happen;
  • Respect for your private life so you don't have to work overtime or on weekends;
  • Team Events budget to socialize outside of work;
  • Company Events to celebrate smaller and bigger successes (Summer Party, Programmer's Day, and trips abroad – so far we've been in South Africa, Are, and Barcelona).

Perks And Benefits

  • Fully remote work or in our office in Wrocław;
  • Benefits such as Luxmed, Multisport, and life insurance in Nationale Nederlanden;
  • Attractive referral system (9,5k for senior, 6k for mid, 2,5k for junior);
  • Personal Training Budget with additional paid hours;
  • Passion Day - an extra day off for your hobby to spend as you please;
  • Flexible working hours with no micro-management approach. Our core hours are 9-15, the rest of the working time is up to you;
  • We provide high-quality work equipment + 2 additional monitors and accessories.

If you apply for this position and match our expectations, then:

  • You will be invited to an HR Screening with our IT Recruiter.
  • You will have a technical interview.
  • You will meet with a client.

Submit your application online in one easy step! Apply now!

You Will Earn

  • B2B: 110 – 145 PLN net/hour + VAT

Key Skills

Ranked by relevance

cloud kotlin microservices postgresql apache aws product owner spring boot kubernetes ai tools kafka git sql ai ux
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Country Guide

Poland

Fast-growing Central European IT hub

Posted
Feb 06, 2026
Type
Full-time
Level
Mid-Senior
Location
Wrocław
Company
Sigma IT Poland

Industries

Information Services IT Services IT Consulting

Categories

Information Technology

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