Senior Fullstack Engineer

At Upside, we're partnering with ambitious companies to solve complex problems through technology. We work in focused teams, combining engineering, product thinking, and design to deliver outcomes. You'll own the entire product experience, design and scale resilient systems, and work at the intersection of product thinking and engineering.

Requirements

• Experience: 5+ years of building complex web applications.
• Backend: Strong proficiency in Python or Ruby.
• Frontend: Mastery of Vue.js or React.js.
• Infrastructure: Solid understanding of SQL (PostgreSQL), CI/CD, and cloud environments.
• AI-Native: You use tools like Claude or Cursor to build better and faster.
• English: Fluent (C1) for direct client collaboration.

Benefits

• Built for the long run: We hire for the company, not just a project - looking for passion driven engineers who want to grow with Upside over time
• Small teams, real accountability: 3-9 people per engagement
• Mission-critical work: We handle complex projects that move the needle for international brands
• Real Ownership: You take part in the decision making process on technology and implementation
• No Micromanagement: We trust you to own your work and deliver outcomes
• Collaborative R&D: Contribute to targeted Open-source projects and internal AI research
• Growth through challenges: Complex problems and direct client exposure means you’ll grow by action
• Applied AI as a first-class discipline: You'll identify where it genuinely moves the needle and lead the implementation