Full-stack Developer

Summary

Join Xfive's engineering team as a talented Full-Stack Developer (Angular + Java) in a full-time freelance role. You will craft Angular front ends and Java back-end APIs, communicate directly with clients, and help shape solution architecture. This freelance opportunity offers flexibility, earning potential between $25 and $35 USD per hour, and room for professional growth. You'll work on diverse projects for clients in the US, UK, and Australia, with the option to work remotely or from the Kraków office. The company fosters a supportive, transparent, and collaborative team environment with opportunities for social engagement. Your work will directly impact the company's direction and contribute to meaningful change.

Requirements

• At least 5 years of professional software development experience
• 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)
• 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
• 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)

Responsibilities

• Develop Angular front ends
• Craft Java back-end APIs
• Communicate directly with clients
• Help shape the architecture of solutions

Preferred Qualifications

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

Benefits

• 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