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Contract: Staff Full-Stack Engineer

Sorry, this job was removed at 04:14 p.m. (EST) on Friday, Nov 21, 2025
Remote or Hybrid
Hiring Remotely in USA
Remote or Hybrid
Hiring Remotely in USA

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Upwork ($UPWK) is the world’s work marketplace. We serve everyone from one-person startups to over 30% of the Fortune 100 with a powerful, trust-driven platform that enables companies and talent to work together in new ways that unlock their potential.  

 Last year, more than $3.8 billion of work was done through Upwork by skilled professionals who are gaining more control by finding work they are passionate about and innovating their careers. 

This is an engagement through Upwork’s Hybrid Workforce Solutions (HWS) Team. Our Hybrid Workforce Solutions Team is a global group of professionals that support Upwork’s business. Our HWS team members are located all over the world.

Are you a Software Engineer who is passionate about design and building highly performant, robust systems to create outstanding user experiences and helping impact the professional lives of millions of independent professionals and clients around the world? Do you relish solving important problems? Do you enjoy identifying potential scalability issues, implementing solutions that follow engineering standard methodologies, and coming up with creative solutions to both technical and product challenges? If so, we’d love to hear from you!

This is a contract position with the potential for contract renewal based on project needs and accomplishment towards deliverables.

General Requirements:
  • Self-motivation, self-organization, and self-education skills;
  • Great communication and collaboration skills (English at least B1 level);
  • Availability for full-time project work, 40 hours per week;
  • Availability for live meetings 8-11 am Pacific Time, 5 days per week.
Work/Project Scope:
  • You will be working with the CX&Trust Engineering leadership, CX&T Engineering teams, other Engineering teams and stakeholders, Product Managers, and Designers to build systems and mechanisms that improve Trust and Safety on Upwork’s Platform and increase efficiency in the Customer Experience/Customer Support.
  • You will have an impact across teams, as well as vertically up into the leadership of engineering organizations. There are four Core Domain teams/areas (CX&T Platform, CX&T Tooling, CX Support, TnS Detection, CX&T IAM) and a supporting QA & Test Automation Domain in CX&T Engineering; you will have the opportunity to support all of these areas. 
  • You will be a champion for Engineering Excellence in CX&T Engineering, driving internal initiatives to improve our overall efficiency and performance. You’ll share the ownership of our code domain and will actively work to increase its quality and reduce technical debt.
  • Our setup requires collaborative work, which includes business requirement analysis, system designs, quick prototyping and coding, code reviews, and writing supporting documentation.
  • Project Types: Initiates projects, initiates and manages PoCs end-to-end, drives vendor assessments, cross-team leadership, and mentors junior/mid-level engineers.
Must Haves (Required Skills):
  • Professional Experience: 10+ years;
  • Solid software development experience using Java;
  • Deep knowledge of modern JavaScript (ES6+), CSS, and HTML;
  • Experience with a modern JS framework, such as Vue, React, or Angular;
  • Extensive knowledge of REST;
  • Experience in writing well-structured, easily maintainable unit tests (such as JUnit, Mockito, etc), integration tests, and e2e tests;
  • Experience with relational databases;
  • Consistent track record of collaborating with large, distributed teams of engineers over documentation and code;
  • A desire to learn new technologies and continually develop your professional skills;
  • Comfortable working with AWS;
  • Experience building / supporting high-load web applications and solving scalability issues;
  • Strong distributed system design skills.

Upwork is proudly committed to fostering a diverse and inclusive workforce. We never discriminate based on race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical condition), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.

To learn more about how Upwork processes and protects your personal information as part of the application process, please review our Global Job Applicant Privacy Notice

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  • Notable Investors: Summit Partners, Volition Capital, Bain Capital Ventures, MassVentures, Highland Capital Partners
  • Research Centers and Universities: MIT, Harvard University, Boston College, Tufts University, Boston University, Northeastern University, Smithsonian Astrophysical Observatory, National Bureau of Economic Research, Broad Institute, Lowell Center for Space Science & Technology, National Emerging Infectious Diseases Laboratories

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