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#137810 - Senior Backend Engineer

Upwork • English • Artificial Intelligence • Design & Creative • Bachelor's Degree • Java • Kotlin • 8 hours ago

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Salary

≈ $91k – $209k per year (Estimated)

Location

Remote (LATAM, PT hours)

Seniority

Middle · 2+ years exp

Employment

Contractor

Confirmed on the employer's own hiring board on Oct 5, 2026. First seen by Alion on Oct 5, 2026. Upwork scores B on the Alion truth index.

Overview

Company

Impact

Profile match

Upwork

Upwork is an American freelance marketplace formed in 2015 from the merger of Elance and oDesk, and it connects businesses with independent professionals in software development, design, writing, marketing and increasingly artificial intelligence work. Its revenue comes from taking a percentage of what clients pay freelancers, which means it has spent years balancing take rate against the incentive for established pairs to leave the platform and transact directly. Headquartered in San Francisco and listed on Nasdaq, it has been positioning itself around higher-value professional work rather than competing at the commodity end of the market.

upwork.com • HQ: San Francisco, United States • Design & Creative • Sales & Marketing • Artificial Intelligence • 1001-5000 employees • Est. 2015

Tech stack of Upwork

Backed by Garage Capital, DAG Ventures, Jackson Square Ventures

We are seeking a Senior Backend Engineer to design, build, and maintain shared backend platforms, services, and products operating at significant scale. You will use AI-assisted coding tools and collaborate with engineering, data science, product, design, and business partners to deliver reliable, high-quality software.

Enterprise experience is strongly preferred.

Key Responsibilities

Design, build, and maintain scalable, reliable, and high-performance software systems.
Contribute to system architecture and technical design, validating solutions through data and experimentation where appropriate.
Participate in code and design reviews to uphold high engineering standards.
Own and support applications during business hours, ensuring system health and reliability.
Use metrics, logging, and analytics to make data-informed decisions and improve system performance.
Collaborate across engineering, product, data science, and design teams to deliver effective solutions.
Contribute to cross-team initiatives and support other engineers through mentorship and knowledge sharing.

Must-Have Skills

A bachelor's degree in Computer Science, Mathematics, Computer Engineering, Electrical Engineering, or a related field with at least 2 years of related experience; or an advanced degree with no prior experience.
Proficiency in one or more modern backend programming languages, such as Java, Kotlin, or similar.
Experience building and operating large-scale, high-performance, and resilient systems.
Excellent communication and collaboration skills in English, with the ability to work effectively across teams.
Curiosity and a willingness to learn, adapt, and take on new challenges.

Required Tools & Platforms

One or more modern backend programming languages, such as Java, Kotlin, or similar.
AI-assisted coding tools; no specific product is prescribed.
Metrics, logging, and analytics tools; no specific platform is prescribed.

Location, Time & Engagement