At DraftKings, AI is becoming an integral part of both our present and future, powering how work gets done today, guiding smarter decisions, and sparking bold ideas. It's transforming how we enhance customer experiences, streamline operations, and unlock new possibilities. Our teams are energized by innovation and readily embrace emerging technology. We're not waiting for the future to arrive. We're shaping it, one bold step at a time. To those who see AI as a driver of progress, come build the future together. The Crown Is Yours As a Senior Backend Engineer, you'll build the high-scale backend systems that power real-time experiences for millions of customers. From day one, you'll ship production-ready code, deliver features with speed and consistency, and own services end-to-end in a fast-moving, always-on environment. You'll work alongside passionate engineers, architects, and product leaders who value quality, speed, and impact. Your ideas will shape what comes next and your growth won't slow down. What You'll Do - Design and develop scalable back-end systems and APIs that power high-impact applications used by a large, engaged user base around the clock. - Deliver production-ready code, driving forward new features and capabilities in a 24/7 sports betting environment. - Prioritize agility and scalability equally to support rapid product rollouts while ensuring systems are built to pivot and perform at scale. - Own the full software development lifecycle, from initial design through long-term maintenance, performance tuning, and reliability improvements. - Triage, investigate, and resolve production issues with urgency, contributing to a culture of continuous improvement and operational excellence. - Ensure all components are built to withstand high volume and real-time demands, optimizing for speed and efficiency. - Collaborate cross-functionally to align technical execution with product goals, mentoring peers and driving quality standards across the team. What You'll Bring - Bachelor's degree in Computer Science or any relevant combination of education, experience, and training. - At least 3 years of professional experience in object-oriented backend development using languages such as C#, with deep knowledge of OOP principles, design patterns, and backend system architecture. - Proven success designing and building scalable distributed systems in Cloud environments such as AWS or Google Cloud Platform (GCP). - Advanced proficiency in writing and maintaining automated test suites, including unit, integration, and performance tests, for large-scale backend services. - A demonstrated ability to mentor and grow other engineers through code reviews, design reviews, and collaborative debugging. #LI-TK1 #LI-REMOTE Join Our Team We're a publicly traded (NASDAQ: DKNG) technology company headquartered in Boston. As a regulated gaming company, you may be required to obtain a gaming license issued by the appropriate state agency as a condition of employment. Don't worry, we'll guide you through the process if this is relevant to your role.

At Mountain Warehouse, we understand that IT is core to our success as a business, so we invest heavily in our in-house team. The development department is divided into product-based teams, all using variants on Kanban for project prioritisation and a focus on continuous delivery, mostly with usage of microservices. **** We are a collaborative team with a strong culture of code reviews, occasional pair programming and plenty of unit testing. We’re keen to write code following best practices and to continuously find ways to improve. The work is a mixture of greenfield and legacy projects (much like any mature organisation) using React, React Native, Typescript, C#, and MongoDB. However, our microservices approach allows us to alter the technology as appropriate. ****

• Design, build, and improve high-performance APIs and services for the Caspar Health app • Design, build, and improve LLM-powered workflows • Collaborate with Product, UX, DevOps, and Engineering teams • Champion best practices in code quality and test automation

• Develop and maintain responsive, modular, and high-quality Angular applications. • Implement UI components using TypeScript, HTML5, CSS/LESS/SCSS, and RxJS reactive patterns. • Manage application state using NgRx or similar state management libraries. • Write robust unit tests using Jest to ensure code quality and maintainability. • Optimize applications for speed, accessibility, and cross-browser compatibility. • Design and implement scalable and secure ASP.NET Core Web APIs. • Write clean and maintainable C# code following SOLID principles and clean architecture practices. • Build unit and integration tests using xUnit. • Develop efficient data-access layers using EF Core. • Collaborate on API architecture, versioning, and documentation. • Design relational database schemas and write optimized SQL for SQL Server. • Perform data modeling to support complex business domains. • Optimize queries and ensure application-level data integrity. • Containerize applications using Docker. • Build and maintain CI/CD pipelines for automated deployments. • Use Git and collaborative branching strategies. • Work closely with DevOps teams to ensure reliable delivery and infrastructure stability.