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Senior Software Engineer @ Square One Resources
  • Warsaw
Senior Software Engineer @ Square One Resources
Warszawa, Warsaw, Masovian Voivodeship, Polska
Square One Resources
21. 10. 2025
Informacje o stanowisku

Time zone: EMEA

We are a company operating in the biotechnology and medical field, developing solutions that directly support healthcare and life sciences. Our software stack has a long history and currently includes Java (1.6/1.8), JSP, Oracle Database, GWT, Swing, Stripes, and Tomcat. We are now embarking on a strategic transformation to modernize our systems, migrate parts of a large monolithic application, and evolve towards a more scalable, maintainable architecture. We are looking for an experienced Senior Software Engineer/Tech Lead who will help us shape the technical direction, lead modernization efforts, and mentor our team through this transition.


  • 8+ years of professional software engineering experience with Java and enterprise systems.
  • Proven experience leading or significantly contributing to modernization projects (e.g., monolith-to-modular/microservices, migration to cloud, refactoring legacy systems).
  • Strong understanding of software architecture, design patterns, and system scalability.
  • Experience with web technologies, APIs, and modern frameworks (Spring Boot, Angular/React, etc.). 
  • Solid knowledge of relational databases (Oracle experience is a strong plus).
  • Familiarity with deployment environments (Tomcat, containers, CI/CD pipelines).
  • Excellent communication skills and ability to collaborate with cross-functional teams.
  • Strong problem-solving mindset and pragmatic approach to balancing technical and business priorities.
  • Experience in biotech/medical/healthcare software is a plus (but not required).
  • DevOps & Cloud: Experience with containerization (Docker, Kubernetes) is highly desirable.
  • Problem Solving: Exceptional analytical and problem-solving skills, with the ability to tackle complex technical challenges and propose innovative solutions.
  • Communication & Leadership: Excellent communication, presentation, and interpersonal skills.
  • Ability to articulate complex technical concepts to diverse audiences and effectively lead technical discussions.

Time zone: EMEA

We are a company operating in the biotechnology and medical field, developing solutions that directly support healthcare and life sciences. Our software stack has a long history and currently includes Java (1.6/1.8), JSP, Oracle Database, GWT, Swing, Stripes, and Tomcat. We are now embarking on a strategic transformation to modernize our systems, migrate parts of a large monolithic application, and evolve towards a more scalable, maintainable architecture. We are looking for an experienced Senior Software Engineer/Tech Lead who will help us shape the technical direction, lead modernization efforts, and mentor our team through this transition.

,[Lead the design and execution of modernization initiatives, including:, Refactoring and extracting functionality from a large Java monolith., Migrating legacy applications (JSP, Swing, GWT, Stripes) to modern frameworks and architectures., Evaluating and introducing new technologies aligned with business needs., Define the long-term technical roadmap for system upgrades, modularization, and scalability., Work closely with stakeholders to understand business and regulatory requirements in the biotech/medical domain., Provide hands-on technical leadership: write high-quality code, review contributions, and ensure best practices., Mentor and support other engineers during the migration and modernization journey., Collaborate with database experts on Oracle optimization and potential migration strategies. Requirements: Java, JSP, API, Oracle, GWT, Tomcat, Microservices, Cloud, Spring Boot, CI/CD Pipelines, DevOps, Docker, Kubernetes, Angular, React Tools: .

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