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Senior Full Stack Engineer
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Offer summary

(Summary generated by AI based on the full job description)

The project concerns large-scale technology modernization in financial services focusing on enterprise system transformation, data migration, and Generative AI. Responsibilities include designing and developing full stack applications, building scalable APIs, legacy system modernization, and cloud-native development. Required skills involve microservices, CI/CD, enterprise applications, and cloud technologies. Benefits include support for sports activities and private medical care.

newquick applyyou can start ASAP

Senior Full Stack Engineer

Company: SQUARE ONE RESOURCES sp. z o.o.

from: 14 September 2026
to: 14 October 2026
150 - 180 złnet (+ VAT)/ hr.B2B contract (full-time)
Salary details
basic salary
Offer parameters
level:senior
working mode:remote
location:Warszawa, Masovian
Warszawa, Masovian

Requirements

Expected technologies

Fullstack

Our requirements

  • Full Stack software development in enterprise environments.
  • Modern backend and frontend application development.
  • Designing and developing REST APIs and integrations.
  • Cloud and cloud-native technologies.
  • Microservices and distributed systems.
  • Enterprise-scale applications and high-availability systems.
  • Legacy application modernization or technology transformation projects.
  • CI/CD and modern software development practices.
  • Working effectively with cross-functional and international teams.

Optional

  • Previous experience in banking or financial services.
  • Experience with legacy or mainframe modernization.
  • Experience integrating modern applications with legacy systems.
  • Knowledge of cloud migration and application transformation.
  • Experience with Generative AI / LLM integrations, Azure OpenAI, AWS Bedrock, RAG or similar technologies.
  • Experience working on large-scale international transformation programs.

Your responsibilities

  • Design, develop, and maintain modern enterprise applications.
  • Work across both backend and frontend development.
  • Build scalable and secure APIs and system integrations.
  • Develop cloud-native applications and services.
  • Contribute to the modernization of legacy applications and enterprise systems.
  • Participate in the transformation of existing systems into modern architectures, including microservices and event-driven solutions.
  • Collaborate with Solution Architects, Technical Leads, DevOps, Data, Cloud, and Mainframe teams.
  • Support application and data migration initiatives.
  • Ensure high standards of code quality, performance, security, and maintainability.
  • Participate in technical discussions and contribute to architectural decisions.
  • Work in an Agile environment with distributed engineering teams.

About the project

Large-scale technology modernization program within the financial services sector.
Program focuses on transforming enterprise systems through modern application development, cloud transformation, legacy and mainframe modernization, data migration, modern software architecture, and Generative AI.

This is how we work on a project

  • Continuous Deployment
  • Continuous Integration
Company

Benefits

  • sharing the costs of sports activities
  • private medical care

SQUARE ONE RESOURCES sp. z o.o.

At Square One Poland we link IT experts with the business. With over 25 years of experience, we specialize in recruitment processes on a global scale. Despite years of experience, we still have a startup DNA and this is our advantage. Our offices are located in London and Warsaw, however, we can reach clients from all over the world, from start-ups to big worldwide corporations.

This is how we work

Senior Full Stack Engineer
150–180 zł / hr. (B2B)
I apply to:
SQUARE ONE RESOURCES sp. z o.o.
Warszawa, Masovian

Need more information?

  • Make sure the body of the offer doesn’t already include what you’re looking for.
  • Ask a question if you need more information you’re interested in.
  • We’ll forward your question to the employer and aim to provide a response within 3 business days.

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