Senior Fullstack Software Engineer (Java & React)

Inetum Polska is part of the global Inetum Group and plays a key role in driving the digital transformation of businesses and public institutions. Operating in cities such as Warsaw, Poznan, Katowice, Lublin, Rzeszow, Lodz the company offers a wide range of IT services. Inetum Polska actively supports employee development by fully funding training, certifications, and participation in technology conferences. Additionally, the company is involved in local social initiatives, such as charitable projects and promoting an active lifestyle. It prides itself on fostering a diverse and inclusive work environment, ensuring equal opportunities for all. 

Globally, Inetum operates in 19 countries and employs over 28,000 professionals. The company focuses on four key areas: 

• Consulting (Inetum Consulting): Strategic advisory services that help organizations define and implement innovative solutions. 

• Infrastructure and Application Management (Inetum Technologies): Designing and managing IT systems tailored to clients’ individual needs. 

• Software Implementation (Inetum Solutions): Deploying partner solutions from industry leaders like Microsoft, SAP, Salesforce, and ServiceNow. 

• Custom Software Development (Inetum Software): Creating unique software solutions to meet specific client needs. 

With strategic partnerships with major technology giants, including Microsoft, SAP, Salesforce, and ServiceNow, Inetum delivers advanced technological solutions tailored to customer requirements. In 2023, Inetum reported revenues of €2.5 billion, underscoring its strong position in the digital services market. 

Inetum distinguishes itself by offering a comprehensive range of benefits that meet the diverse needs of employees, providing flexibility, support and commitment. Here's what makes working at Inetum unique: 

Flexible and hybrid work: 

• Flexible working hours.  

• Hybrid work model, allowing employees to divide their time between home and modern offices in key Polish cities. 

Attractive financial benefits: 

• A cafeteria system that allows employees to personalize benefits by choosing from a variety of options. 

• Generous referral bonuses, offering up to PLN6,000 for referring specialists. 

• Additional revenue sharing opportunities for initiating partnerships with new clients. 

Professional development and team support: 

• Ongoing guidance from a dedicated Team Manager for each employee. 

• Tailored technical mentoring from an assigned technical leader, depending on individual expertise and project needs. 

Community and Well-Being: 

• Dedicated team-building budget for online and on-site team events. 

• Opportunities to participate in charitable initiatives and local sports programs. 

• A supportive and inclusive work culture with an emphasis on diversity and mutual respect. 

We are looking for aSenior Fullstack Software Engineer (Java & React) to join a team developing a large-scale digital commerce platform based onmicroservices and micro-frontends.

You will work end-to-end withJava 25, Spring Boot 4, Spring WebFlux, React, TypeScript and Kubernetes, building new features, integrating backend services and helping modernize the existing platform through legacy migration and technical debt reduction.

A key part of the project isAI-driven development, with coding agents and GitHub Copilot becoming part of everyday engineering. We are looking for someone who actively uses AI coding tools and is interested in shaping how they can improve software development.

Main tasks

• Develop and evolve a distributed online platform based onmicroservices and micro-frontends.
• Takeend-to-end ownership of features, working across both backend and frontend within the same service.
• Build and maintain backend services usingJava, Spring Boot and Spring WebFlux, including REST APIs and integrations with internal and backend systems.
• Develop frontend functionality usingReact, TypeScript, JavaScript, HTML and NPM.
• Work with content delivered through aCMS and related content delivery services.
• Implement new platform features and support the migration of legacy applications to the modern architecture.
• Improve the existing codebase throughrefactoring, technical debt reduction and resolution of long-standing technical issues.
• Contribute to the adoption of new API standards, includingTM Forum Open APIs.
• Work with containerized applications usingKubernetes and Docker, including deployment, operation, monitoring and troubleshooting.
• UseAI coding agents and AI-assisted development workflows as part of your daily work and contribute to improving these practices within the team.
• Work on multiple initiatives of different sizes, from short tasks to larger projects.
• Participate in knowledge-transfer activities, keep technical documentation up to date and actively share knowledge with other developers.

Requirements

• Several years of professional experience in developing modern web applications, withstrong backend expertise and the ability to work independently at Senior level.
• Strong practical knowledge ofJava 8+ and Spring Boot, as well as REST API design with JSON.
• Familiarity with current versions of the Java/Spring ecosystem and a strong understanding ofreactive programming, supported by hands-on experience withSpring WebFlux, Project Reactor or a comparable reactive stack.
• Hands-on frontend experience withReact, TypeScript, JavaScript, HTML and NPM, with the confidence to work across frontend and backend within the same service.
• Experience withJUnit, Mockito, WireMock, Git, JPA/Hibernate and XML processing technologies such asXSLT, XPath and XQuery.
• Hands-on experience withKubernetes and Docker, including deployment, operation, monitoring and troubleshooting of containerized applications in cloud-native environments.
• Experience developing and evolvingmicroservice-based and distributed systems, including working with established, long-running codebases.
• Practical experience withAI-driven software development, for example GitHub Copilot, OpenCode, coding agents, context management, harness engineering or spec-driven development.
• Regular use ofAI coding agents in software development, including adapting prompts or skills to your needs and using AI to generate a meaningful part of your code. You should be able to explain how these tools improve your development workflow.
• Ability to take ownership of features fromdesign through production and make sound technical decisions within a distributed architecture.
• A proactive, analytical and quality-oriented approach, with a focus on continuous improvement and practical problem-solving.
• Willingness to challenge existing approaches, contribute your own ideas, review code, share knowledge and support other developers.
• Ability to work effectively in anAgile, distributed and international environment.
• English and Polish, both written and spoken (minimum B2).

Nice to have

• Experience withmicro-frontend architectures.
• Knowledge ofHelm charts and Jenkins CI/CD pipelines.
• Experience withheadless or content-driven systems, particularly NEOS CMS.
• Experience migrating legacy applications to modern platforms.
• Experience with larger refactoring and technical debt reduction initiatives.
• Previous experience working in distributed, multinational and remote teams.
• Knowledge ofBDD and test automation beyond unit testing, for example Playwright.

This position offers ahybrid or remote work model. Office location:Warszawa, Poznań, Lublin

Please be advised that we will contact only selected candidates

We hereby inform you that Inetum Polska sp. z o.o. has implemented an internal reporting (whistleblowing) procedure. The content of the procedure and the possibility to submit an internal report are available at:

https://inetum.whispli.com/speakup?locale=pl