• Lead the migration of services from our monolithic codebase to a distributed microservices architecture—designing for scalability, reliability, and long-term maintainability. • Design and build microservices that integrate cleanly into our broader distributed system, with strong attention to observability and fault tolerance. • Apply sound architectural patterns across APIs, database schemas, and event-driven systems—making decisions that won’t box the team in as we scale. • Anticipate where architectural decisions create downstream risk, raise them early, and bring a concrete path forward. • Deliver production-ready code at a high cadence—contributing meaningfully within the first 30 days and sustaining that pace as scope grows. • Write advanced, adaptable code that captures the core essence of the solution and holds up as requirements evolve. • Identify and resolve production issues—individually or as part of a team—and take technical ownership of the health of systems you touch. • Distinguish reversible from irreversible decisions and act accordingly: move fast where it’s safe to, slow down where it matters. • Serve as a technical partner in cross-functional settings—representing the engineering perspective to technical and non-technical audiences with clarity. • Work collaboratively with product, design, and data science to ship solutions that meet patient and business needs. • Communicate progress, blockers, and risks proactively—not at the deadline. • Mentor and coach mid-level and senior engineers—helping them grow their craft through direct feedback, pairing, and code review. • Role model high technical, cultural, and process standards: quality is the baseline, not the goal. • Continuously build and share domain expertise—turning what you learn into leverage for the team. • Actively use AI tools (e.g., ChatGPT, Claude, Gemini) to accelerate design, code generation, debugging, and documentation—with a clear point of view on where AI helps and where human judgment is non-negotiable. • Review AI-generated outputs critically before acting on them—take personal accountability for everything you ship, regardless of how it was produced. • Share what’s working and what isn’t with your team—AI fluency grows collectively, not just individually.

Role Description We are seeking a skilled and motivated Fullstack Developer to join our team. In this role, you will be responsible for designing, developing, and maintaining both front-end and back-end applications that deliver high-quality user experiences and scalable system performance. The ideal candidate is passionate about technology, problem-solving, and building efficient web applications. You will collaborate closely with cross-functional teams including product, design, and engineering to develop innovative solutions that align with business objectives and user needs. This position requires strong technical expertise, attention to detail, and the ability to work effectively in a fast-paced and collaborative environment. Key Responsibilities - Develop, maintain, and optimize front-end and back-end web applications - Build responsive and user-friendly interfaces using modern front-end frameworks - Design and manage APIs, databases, and server-side functionality - Collaborate with product managers, designers, and developers to deliver high-quality features - Write clean, scalable, and maintainable code following best practices - Troubleshoot, debug, and resolve technical issues across the application stack - Optimize application performance, security, and scalability - Participate in code reviews, testing, and deployment processes - Integrate third-party services, APIs, and cloud-based solutions - Maintain technical documentation and contribute to process improvements Qualifications - Proven experience as a Fullstack Developer, Software Engineer, or similar role - Strong proficiency in front-end technologies such as HTML, CSS, JavaScript, and modern frameworks like React, Vue, or Angular - Experience with back-end technologies such as Node.js, Python, PHP, Java, or similar languages - Familiarity with RESTful APIs, database management, and server-side architecture - Experience with SQL and/or NoSQL databases - Understanding of version control systems such as Git - Experience working with cloud platforms and deployment environments is a plus - Strong problem-solving and analytical skills - Ability to work independently and collaboratively within a team environment - Excellent communication and organizational skills Requirements - Experience with TypeScript, Next.js, or modern fullstack frameworks - Familiarity with Docker, CI/CD pipelines, and DevOps practices - Experience in SaaS, startup, or agile development environments - Knowledge of testing frameworks and software development best practices - Bachelor’s degree in Computer Science, Software Engineering, or a related field preferred Core Competencies - Problem-solving and critical thinking - Collaboration and teamwork - Adaptability and continuous learning - Attention to detail and code quality - Time management and accountability - Innovation and technical curiosity By applying to this position, we’ll create your Simera Professional Key (SPK) — a unique key that helps you connect with employers, stand out, and secure the right match.

• Implement and maintain WebExtensions APIs and Addon Management, balancing power, safety, and performance, as well as user interfaces in Firefox. • Debug and fix issues affecting extensions in Firefox. • Collaborate with product managers, QA, and the AMO engineering team to deliver features end-to-end. • Contribute to Mozilla-owned extensions and system add-ons. • Participate in open source workflows: code reviews, pull requests, and discussions in Bugzilla/GitHub. • Support extension developers by helping diagnose issues and improving tooling/documentation.

• Implement and maintain WebExtensions APIs and Addon Management, balancing power, safety, and performance, as well as user interfaces in Firefox • Debug and fix issues affecting extensions in Firefox • Collaborate with product managers, QA, and the AMO engineering team to deliver features end-to-end • Contribute to Mozilla-owned extensions and system add-ons • Participate in open source workflows: code reviews, pull requests, and discussions in Bugzilla/GitHub • Support extension developers by helping diagnose issues and improving tooling/documentation