Senior Software Engineer

Senior Software Engineer

DraftKings

Sofia or Remote, Bulgaria

The Crown Is Yours

As a Senior Software Engineer, you'll lead the development of seamless, high-impact user experiences across our customer-facing products. You'll own key aspects of frontend architecture, drive performance improvements, and shape technical direction across teams. Collaborating with engineers, designers, and product managers, you'll turn complex challenges into scalable, reliable solutions that power millions of user interactions. In this role, your decisions will impact and shape the future of our platform.

What you’ll do as a Senior Software Engineer

• Design and develop performant, scalable frontend systems for real-time, high-traffic applications.
• Take ownership of core frontend architecture, advocating for and implementing best practices in code quality, performance, and accessibility.
• Ship production-grade code that enhances user flows, improves speed, and strengthens cross-platform stability.
• Lead design and code reviews, mentor junior engineers, and promote a culture of technical excellence.
• Collaborate across teams to translate business needs into intuitive, impactful features.
• Drive improvements in our design systems, tooling, and frontend infrastructure to support long-term growth.
• Investigate and resolve complex bugs and performance bottlenecks across browsers and devices.

What you’ll bring

• At least 3 years of professional experience building modern frontend applications using frameworks such as React, Vue, or Angular.
• Strong expertise in JavaScript, HTML, and CSS, with deep knowledge of browser behaviors and rendering performance.
• Solid understanding of object-oriented programming, software design principles and data structures and algorithms.
• Proven experience delivering performant, responsive, and accessible interfaces at scale.
• Proficiency in writing and maintaining test suites for frontend applications, including unit, integration, and end-to-end tests.
• A strong collaborator with experience mentoring teammates and leading technical discussions.
• Ability to break down complex problems, make data-informed decisions, and thrive in a fast-paced environment.
• A mindset focused on user impact, maintainability, and continuous improvement.
• Good level of verbal and written English for clear communication within a global team.