Full-stack Developer (Angular + Java)

Xfive is scouting for a talented Full-Stack Developer (Angular + Java) to power up our engineering crew.

Job Summary

We’re looking for a mid- to senior-level engineer who’s equally at home crafting Angular front ends and Java back-end APIs. In this full-time freelance role, you’ll do more than just code; you’ll communicate directly with clients and help shape the architecture of our solutions.

What We Offer

We’re all about building a team where you can thrive and do your best work. Here’s what you’ll love about working with us:

• Freelance opportunity: Enjoy the flexibility of a freelance contract and earn between $25 and $35 USD per hour, depending on your experience and expertise.

• Room to grow: We support continuous learning and professional development to help you advance your career.

• Make an impact: Your ideas and work will directly influence our direction and help drive meaningful change.

• Diverse projects: Work on exciting projects for startups, agencies, and companies based in the US, UK, and Australia.

• Work your way: Choose to work from home, your favorite coffee shop, or our Kraków office (we’ve got a nice parking space too!).

• Set your schedule: Work the hours that suit you best, as long as there's some overlap with the team and clients.

• Transparency: We’re open and honest about the company’s decisions, direction, and performance, so you’re always in the loop.

• Supportive team: You’ll never be left alone. Our team is collaborative and always ready to help each other.

• Great vibes: Join a team of open-minded, fun, and friendly people who enjoy what they do.

• Stay connected: Participate in social events, both online and in person, to stay engaged and build connections.

Requirements

Must-Have:

• At least 5 years of professional software development experience, including:

• 3+ years with Angular

• 3+ years with Java Spring Boot.

• Strong verbal and written English communication skills (B2+ level), with the ability to talk directly with clients in online meetings.

• Basic Polish communication skills (A2+ level) to communicate with our local Team.

• Ability to deliver high-quality service and work independently.

• Availability of at least 40 hours per week.

• Solid programming fundamentals and understanding of best practices (e.g., DRY, KISS, abstraction, refactoring, optimization, security).

Frontend (Angular):

• Strong knowledge of Vanilla JavaScript (ES6+).

• Advanced proficiency with Angular v18+.

• Deep understanding of Dependency Injection and Angular Signals.

• Experience with new Angular Control Flow (@if, @for, @switch).

• Familiarity with Standalone Components and NgModule-free architecture.

• Experience with @defer and performance-focused reactive patterns.

• Proficient with RxJS and state management.

Backend (Java):

• Strong command of Java and Spring Boot.

• Familiarity with non-relational databases like MongoDB.

• Experience building RESTful APIs and working with microservices.

• Understanding of Java concurrency and multi-threading.

• Experience with testing frameworks like JUnit and Mockito.

• Familiarity with Spring Security for authentication and authorization.

• Proficiency with build tools such as Maven or Gradle.

• Experience with containerization (Docker) and orchestration platforms (e.g., Kubernetes).

• Good understanding of logging and monitoring tools for Java apps (e.g., SLF4J, Logback, ELK stack).

Nice-to-Have:

• Experience with C++ API development for high-performance services or native integrations.

• Familiarity with Carbon Design System or other enterprise-grade component libraries.