Full Stack Engineer (Java & JavaScript)

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: Software Development / AI & Code Intelligence

Client Location: Israel

Company size: 11–50

Founded in: 2015

An Israeli technology company developing an AI-powered platform for understanding and modernizing complex and legacy codebases. The company helps businesses analyze existing systems, reverse engineer code, plan modernization, and transform legacy applications into modern, AI-ready solutions. The environment is product-focused, engineering-driven, and centered around innovation and practical use of AI.

What makes this project exciting?

We're looking for a Senior Full Stack Developer to join our engineering team and help build and improve an AI-powered platform for code analysis and modernization. You’ll work with complex legacy codebases, using your expertise in Java and modern architectures to reverse engineer existing systems and help transform them into modern, scalable solutions.

This role combines software engineering, AI, and product thinking. You’ll work hands-on with the platform, provide feedback on its capabilities, and help shape new features and workflows for modernizing legacy applications.

What makes you a great fit

• 5 years of full-stack development experience, with strong backend experience in Java.
• Experience working with legacy systems and large or poorly documented codebases.
• Experience with a modern frontend framework, such as React, Vue or Angular.
• Experience with migrations, upgrades or monolith-to-microservices projects.
• Strong testing experience: characterization tests, parity checks, safe refactoring
• Daily use of AI coding tools, with the ability to evaluate their output critically.s.
• At least Upper-Intermediate level of English

Nice to Have:

• Experience with MCP servers or building context for AI agents
• Experience with gradual migration techniques, such as moving functionality piece by piece and switching between old and new code safely
• JavaScript/TypeScript, COBOL or mainframe exposure
• Experience working on client sites or inside a client’s team

Your day-to-day in this position

• Analyze and understand legacy and unfamiliar codebases using the company’s AI-powered platform.
• Validate the platform’s analysis and provide detailed feedback on its results and capabilities.
• Work on code modernization, including migrations, architectural improvements and monolith-to-microservices transformations.
• Use the platform and AI tools to explore how existing systems can be reverse-engineered and forward-engineered.
• Help identify missing functionality and suggest product improvements based on real engineering experience.
• Collaborate closely with the product and engineering teams to improve the process of working with legacy codebases.

Why work with us?

• People-first management with minimal bureaucracy
• A friendly company culture, proven by employees who choose to return
• Flexible working hours
• Full financial and legal support for independent contractors
• Free English classes, with native speakers or Ukrainian teachers
• Dedicated HR support

Our next steps

✅ Intro call with a Recruiter — ✅ Intro with the client — ✅ Home assignment — ✅ Offer

Requirements