• Be a Software Engineer, not just an "intern". • Ship many different projects during your summer. • Engineers at Twilio solve problems in distributed computing, real-time DSP (audio processing), virtualization performance, distributed messaging, busses and more. • During your internship, you will be given responsibility for core features and services that ship to our users. • You will be expected to embrace these challenges, learn fast and deliver great results. • You will bring a willingness to learn and grow, and we will reciprocate with ample opportunity to do just that, in a friendly, fun and exciting startup environment! • Learn to develop beautiful and profitable applications. • Demonstrate consistent improvement in your coding skills, issue-tracking and source control systems, and agile development mentality. • Participate in code reviews, bug tracking and project management with the rest of the Twilio Team.

• Plan and deliver major features and architectural improvements across the Add-ons stack, including automated moderation pipelines, Reviewer tools, and DevHub. • Partner with Engineering management to set Operations Engineering standards (SLOs, incident management, observability baselines). • Mentor engineers, sharing knowledge and delegating responsibilities to help others grow. • Improve platform reliability through deployments, monitoring, and incident response. • Help keep the platform safe and trustworthy, with attention to security and user trust. • Step in to resolve issues impacting users and developers, from small bugs to larger incidents. • Collaborate with designers, product managers, QA, and community contributors to deliver end-to-end improvements. • Contribute in the open through pull requests, code reviews, and discussions. • Work on: Full stack development: React/TypeScript frontends, Django backend, MySQL datastore; Platform reliability: deployments, monitoring, and incident response on Google Cloud; Feature development: submission flows, trust and safety signals, DevHub and Reviewer tools modernization; Ecosystem moderation: abuse report management, policy compliance, and ecosystem safety; Open collaboration: We work in the open, with contributions from Mozilla staff and community members.

• You will work closely with other teams to understand their main pain points and translate them into self-serve and reliable solutions. • You are expected to mentor other team members and be a champion of engineering excellence. • You will be part of a small team, with a large amount of ownership and autonomy for managing things directly. • You will have the freedom to suggest and drive organization-wide initiatives.

Role Description We are seeking a skilled Full Stack Developer with experience in C#, .NET, TypeScript, and React.js to build scalable, high-quality web applications. The ideal candidate understands modern front-end and back-end development practices and has working knowledge of web accessibility (ADA / WCAG), ensuring our applications are usable for all users, including those with disabilities. - Design, develop, and maintain web applications using C#/.NET on the back end and React.js (TypeScript) on the front end. - Build and consume RESTful APIs and integrate with internal and external services. - Implement responsive UI components with high performance and maintainability. - Collaborate with product managers, designers, and QA engineers to deliver high-quality features. - Participate in code reviews, architectural discussions, and process improvements. - Optimize existing systems for scalability, performance, and security. Accessibility (ADA/WCAG) Responsibilities - Ensure all front-end code adheres to WCAG 2.1 / 2.2 Level A & AA accessibility standards. - Implement semantic and accessible HTML structures, ARIA attributes, keyboard navigation support, and proper focus management. - Collaborate with QA to resolve accessibility defects discovered through automated or manual accessibility testing. - Utilize accessibility testing tools in development workflows, including: - axe DevTools - WAVE - Siteimprove Accessibility Checker - Collaborate with UX/UI designers to ensure accessible design patterns (contrast, hierarchy, navigation, alt texts, etc.). - Validate components for screen reader compatibility (NVDA, JAWS, VoiceOver). - Advocate accessibility-first engineering across the development lifecycle. Qualifications - Bachelor’s degree in Computer Science, Software Engineering, Information Technology, or related field (or equivalent practical experience). - 5+ years of professional experience as a Full Stack Developer. - MUST have hands-on experience of web accessibility standards (ADA / WCAG 2.1/2.2). - Strong experience with: - C#, .NET Core/.NET 6+ - TypeScript - React.js and modern React patterns (hooks, context API, reusable components) - Strong understanding of HTML5, CSS3, Flexbox, Grid, and modern UI development. - Experience with SQL and/or NoSQL databases. - Familiarity with CI/CD pipelines, Git, and DevOps practices. - Understanding of REST APIs, microservices, and integration patterns. - Ability to diagnose and fix accessibility issues—keyboard traps, missing alt text, poor focus management, etc. - Experience with screen reader testing (NVDA/VoiceOver) is a plus. - Strong problem-solving, debugging, analytical, and communication skills. Benefits - We have an amazing team of 700+ individuals working on highly innovative enterprise projects & products. - Our customer base includes Fortune 100 retail and CPG companies, leading store chains, fast-growth fintech, and multiple Silicon Valley startups. - Focus on processes and culture. - ISO certifications: ISO 9001:2015 (QMS), ISO 27001:2022 (ISMS), ISO 20000-1:2018 (ITSM), ISO 14001:2015 (EMS), ISO 45001:2018 (OHSMS). - A vibrant culture of learning via collaboration and making the workplace fun. - Work with cutting-edge technologies while contributing success to the company as well as to yourself.