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 Software 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# or Java, 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. 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.

Job Title: Ruby on Rails Developer Position Type: Full-Time, Remote Working Hours: U.S. client business hours (with flexibility for sprint reviews, deployments, and on-call support) About the Role: Our client is seeking a Ruby on Rails Developer to build and maintain applications using the Rails framework. This role involves designing back-end systems, integrating APIs, managing databases, and collaborating with front-end teams to deliver end-to-end features. The Rails Developer ensures applications are secure, performant, and scalable, while contributing to a culture of clean code and best practices. Responsibilities: Application Development: - Build and maintain Rails applications, APIs, and background jobs. - Implement business logic with ActiveRecord models, controllers, and views. - Integrate front-end frameworks (Stimulus, React, Vue) into Rails apps where required. Database Management: - Design, migrate, and maintain schemas in PostgreSQL or MySQL. - Optimize queries for performance and scalability. - Implement indexing, caching, and background jobs (Sidekiq, Resque). Testing & Quality Assurance: - Write and maintain unit, integration, and system tests (RSpec, Minitest, Capybara). - Ensure CI/CD pipelines are configured for automated testing and deployment. - Maintain ≥80% code coverage and enforce style/linting rules (RuboCop, StandardRB). Security & Compliance: - Implement user authentication/authorization (Devise, OmniAuth). - Enforce security best practices (CSRF protection, input validation, OWASP). - Ensure compliance with data privacy laws (GDPR, HIPAA as applicable). Performance & Monitoring: - Optimize page load times, API response times, and background job throughput. - Monitor systems with tools like New Relic, Datadog, Honeybadger, or Rollbar. - Troubleshoot issues and deploy hotfixes with minimal downtime. Collaboration & Documentation: - Work with product managers and designers to scope and prioritize features. - Participate in sprint ceremonies and provide accurate story estimates. - Document code, APIs, and workflows for long-term maintainability. What Makes You a Perfect Fit: - Deep knowledge of the Rails ecosystem and conventions. - Strong problem-solver who can balance speed and scalability. - Passion for clean, maintainable, and well-tested code. - Effective communicator, comfortable collaborating across teams. Required Experience & Skills (Minimum): - 3+ years Ruby on Rails development experience. - Proficiency in Ruby, Rails, ActiveRecord, and MVC architecture. - Experience with PostgreSQL/MySQL and background job frameworks (Sidekiq, Resque). - Familiarity with Git workflows and CI/CD tools. Ideal Experience & Skills: - Experience with front-end integration (Stimulus, React, Vue). - Deployed Rails apps to Heroku, AWS, or GCP. - Familiarity with caching (Redis, Memcached). - Industry exposure in SaaS, fintech, healthcare, or e-commerce. What Does a Typical Day Look Like? A Rails Developer’s day revolves around building features, maintaining systems, and ensuring performance. You will: - Review sprint tasks, picking up new feature tickets from the backlog. - Write code for Rails applications, implementing business logic and integrating APIs. - Run and review tests, ensuring new code meets quality standards. - Collaborate with front-end and product teams, aligning features with user requirements. - Optimize performance by tuning queries, adding caching, or fixing bottlenecks. - Monitor error dashboards (Honeybadger, Rollbar) and deploy fixes as needed. - Document changes and update repos to keep the codebase maintainable. In essence: you ensure applications are reliable, scalable, secure, and continuously improving. Key Metrics for Success (KPIs): - Features delivered on time and aligned with requirements. - Error rates and downtime minimized (≥99.9% uptime). - Test coverage maintained ≥80%. - Reduced technical debt and improved code maintainability. - Positive stakeholder feedback on feature quality and performance. Interview Process: - Initial Phone Screen - Video Interview with Pavago Recruiter - Technical Assessment (e.g., build a small Rails API with models, endpoints, and tests) - Client Interview with Engineering Team - Offer & Background Verification

Job Title: Ruby on Rails Developer Position Type: Full-Time, Remote Working Hours: U.S. client business hours (with flexibility for sprint reviews, deployments, and on-call support) About the Role: Our client is seeking a Ruby on Rails Developer to build and maintain applications using the Rails framework. This role involves designing back-end systems, integrating APIs, managing databases, and collaborating with front-end teams to deliver end-to-end features. The Rails Developer ensures applications are secure, performant, and scalable, while contributing to a culture of clean code and best practices. Responsibilities: Application Development: - Build and maintain Rails applications, APIs, and background jobs. - Implement business logic with ActiveRecord models, controllers, and views. - Integrate front-end frameworks (Stimulus, React, Vue) into Rails apps where required. Database Management: - Design, migrate, and maintain schemas in PostgreSQL or MySQL. - Optimize queries for performance and scalability. - Implement indexing, caching, and background jobs (Sidekiq, Resque). Testing & Quality Assurance: - Write and maintain unit, integration, and system tests (RSpec, Minitest, Capybara). - Ensure CI/CD pipelines are configured for automated testing and deployment. - Maintain ≥80% code coverage and enforce style/linting rules (RuboCop, StandardRB). Security & Compliance: - Implement user authentication/authorization (Devise, OmniAuth). - Enforce security best practices (CSRF protection, input validation, OWASP). - Ensure compliance with data privacy laws (GDPR, HIPAA as applicable). Performance & Monitoring: - Optimize page load times, API response times, and background job throughput. - Monitor systems with tools like New Relic, Datadog, Honeybadger, or Rollbar. - Troubleshoot issues and deploy hotfixes with minimal downtime. Collaboration & Documentation: - Work with product managers and designers to scope and prioritize features. - Participate in sprint ceremonies and provide accurate story estimates. - Document code, APIs, and workflows for long-term maintainability. What Makes You a Perfect Fit: - Deep knowledge of the Rails ecosystem and conventions. - Strong problem-solver who can balance speed and scalability. - Passion for clean, maintainable, and well-tested code. - Effective communicator, comfortable collaborating across teams. Required Experience & Skills (Minimum): - 3+ years Ruby on Rails development experience. - Proficiency in Ruby, Rails, ActiveRecord, and MVC architecture. - Experience with PostgreSQL/MySQL and background job frameworks (Sidekiq, Resque). - Familiarity with Git workflows and CI/CD tools. Ideal Experience & Skills: - Experience with front-end integration (Stimulus, React, Vue). - Deployed Rails apps to Heroku, AWS, or GCP. - Familiarity with caching (Redis, Memcached). - Industry exposure in SaaS, fintech, healthcare, or e-commerce. What Does a Typical Day Look Like? A Rails Developer’s day revolves around building features, maintaining systems, and ensuring performance. You will: - Review sprint tasks, picking up new feature tickets from the backlog. - Write code for Rails applications, implementing business logic and integrating APIs. - Run and review tests, ensuring new code meets quality standards. - Collaborate with front-end and product teams, aligning features with user requirements. - Optimize performance by tuning queries, adding caching, or fixing bottlenecks. - Monitor error dashboards (Honeybadger, Rollbar) and deploy fixes as needed. - Document changes and update repos to keep the codebase maintainable. In essence: you ensure applications are reliable, scalable, secure, and continuously improving. Key Metrics for Success (KPIs): - Features delivered on time and aligned with requirements. - Error rates and downtime minimized (≥99.9% uptime). - Test coverage maintained ≥80%. - Reduced technical debt and improved code maintainability. - Positive stakeholder feedback on feature quality and performance. Interview Process: - Initial Phone Screen - Video Interview with Pavago Recruiter - Technical Assessment (e.g., build a small Rails API with models, endpoints, and tests) - Client Interview with Engineering Team - Offer & Background Verification

• Trabajar sobre sistemas existentes, entendiendo su comportamiento antes de hacer cambios. • Leer y analizar código como parte central del trabajo, no como paso previo opcional. • Implementar cambios pequeños y seguros, validando impacto antes de escalar. • Colaborar de forma cercana con otros engineers en decisiones técnicas y resolución de problemas. • Participar en dinámicas de trabajo conjunto (pairing, revisión activa, discusión de soluciones). • Detectar riesgos antes de que lleguen a producción. • Priorizar soluciones simples que puedan evolucionar, en lugar de diseños complejos desde el inicio. • Asegurar calidad a través de testing, validación continua y criterio técnico.