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-Haves:

• 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.
• 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-Haves:

• Experience with C++ API development for high-performance services or native integrations.
• Familiarity with Carbon Design System or other enterprise-grade component libraries.