Senior Full Stack Engineer

MWDN; Warszawa; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Flexible working hours

29 days PTO

Free English classes

HR support

Independent contractor legal support

Job summary

MWDN is a global IT outstaffing company delivering teams for clients across Israel, the USA, Great Britain, and Western Europe. We are seeking a Senior Full Stack Engineer to design, develop, and maintain scalable web apps with .NET and React, collaborating with Product, QA, UX/UI, and other engineering teams to deliver high-quality solutions.

You will focus on architectural design, code quality, API development, and system performance while following Agile practices and contributing to best

Qualifications

• 5+ years of experience in full-stack software development.
• Strong experience with .NET / C#.

Responsibilities

• Design, develop, and maintain scalable full-stack applications using .NET and React.
• Build high-quality, reusable, and maintainable code for both backend and frontend components.
• Develop and integrate RESTful APIs and backend services.
• Collaborate with Product, UX/UI, QA, and other development teams to deliver end-to-end solutions.
• Participate in system design, architecture discussions, and technical decision-making.
• Optimize application performance, scalability, and security.
• Troubleshoot, debug, and resolve technical issues across the full stack.
• Work with Docker, deployment pipelines, and monitoring tools to support reliable application delivery and operations.
• Conduct code reviews and mentor junior developers.
• Follow Agile development methodologies and software development best practices.

Skills

Full-stack development

.NET / C#

React

JavaScript/TypeScript

REST APIs

SQL databases

Git

CI/CD

OO design

Problem solving

Independent work

English

Tools

Docker

Git

CI/CD

Job description

MWDN is a global IT outstaffing company with 23+ years of experience that connects exceptional tech talent with leading companies across Israel, the USA, Great Britain, and Western Europe. We offer opportunities to work on international products in a stable and professional environment.

Why does MWDN rock?

Here’s what you can expect when you join MWDN:

• Security: We carefully vet our clients to minimize risks and ensure reliability and timely payments - no fraud or unpleasant surprises.
• Career support: If a project isn’t the right fit, we support you and actively help find new opportunities that match your skills and career goals.
• Legal assistance: We provide guidance on legal matters, including opening and managing your independent contractor or sole proprietorship status, taxes, and related processes.
• Professional development: We offer English courses and professional growth opportunities, as well as team-building events.

Why choose us? MWDN is ranked among the top 5 IT employers in our region according to DOU. We take pride in our transparency and strong commitment to our team. Curious to learn more? See what our employees say about working with us on DOU.

What is your new project?

Domain: Financial Services

Client Location: Europe

Company size: 200-500 employees

Founded in: 2006

What makes this project exciting?

We are seeking a Senior Full Stack Engineer to join our Development team. In this role, you will design, develop, and maintain scalable web applications, working across both frontend and backend technologies. You will collaborate closely with Product, QA, UX/UI, and other engineering teams to deliver high-quality solutions while contributing to technical design, architecture, and best practices.

What Makes You a Great Fit

• 5+ years of experience in full-stack software development.
• Strong experience with .NET / C#.
• Strong experience with React and modern JavaScript/TypeScript.
• Experience building and consuming REST APIs.
• Experience with SQL databases.
• Experience with Docker, deployment configurations, and monitoring tools.
• Experience with Git and CI/CD workflows.
• Strong understanding of object-oriented design principles and software architecture.
• Excellent problem-solving and analytical skills.
• Ability to work independently and collaborate effectively in a cross‑functional team.
• Good written and spoken English.

Your Day-to-day In This Position

• Design, develop, and maintain scalable full-stack applications using .NET and React.
• Build high-quality, reusable, and maintainable code for both backend and frontend components.
• Develop and integrate RESTful APIs and backend services.
• Collaborate with Product, UX/UI, QA, and other development teams to deliver end-to-end solutions.
• Participate in system design, architecture discussions, and technical decision-making.
• Optimize application performance, scalability, and security.
• Troubleshoot, debug, and resolve technical issues across the full stack.
• Work with Docker, deployment pipelines, and monitoring tools to support reliable application delivery and operations.
• Conduct code reviews and mentor junior developers.
• Follow Agile development methodologies and software development best practices.

Why work with us?

• People-first management with minimal bureaucracy
• A friendly company culture, proven by employees who choose to return
• Flexible working hours
• 29 days of PTO (18 working days per year pluse all national holidays)
• 10 paid recovery days
• Full financial and legal support for independent contractors
• Free English classes, with native speakers or Ukrainian teachers
• Dedicated HR support