Full Stack Software Engineer

About Cala At Cala, we’re working to free people from the burden of chronic disease. We began by creating the first non-invasive prescription therapy for hand tremor. After years of careful fine-tuning and improvements, we released Cala kIQ — our most sophisticated therapy yet. Our products have empowered thousands of people to get back to their lives with confidence and ease. But we won’t stop there. Our pioneering technology can be applied across neurology, cardiology, and so much more. It’s all part of our mission to help people in their struggle with chronic disease. We’re only just getting started. Role Overview We are seeking a versatile Full Stack Software Engineer to join our engineering team. Reporting to the Software Engineering Manager, this is a hands-on role requiring comfort and confidence in working across the entire stack, with a particular emphasis on user-facing frontend experiences. While the baseline expectation is full-stack competency, the nature of our product cycles means your focus will shift. Assignments may prioritize frontend interface design, backend logic, or a seamless combination of both based on product needs. You will be a key player in bridging the gap between complex backend logic and modern, interactive interfaces. Candidates across the US are encouraged to apply. Proximity to headquarters in the San Francisco Bay Area is preferred but not required. Applicants must be currently authorized to work in the United States on a full-time basis. Cala will not sponsor applicants for work visas. The compensation range for this role is market driven, with a salary range of $125,000 - $160,000. Additionally, we offer a robust benefits package. This offering is aligned with our overall compensation philosophy. AI Disclaimer: Cala does not permit the use of AI during interviews and technical testing so that we can property assess thought process and skillset. Specific Responsibilities Web & Mobile Development: Build delightful, performant, and accessible user experiences for our consumer-facing applications across Web and Mobile using React and React Native . End-to-End Ownership: Contribute across the stack, owning features end-to-end from frontend implementation through backend integration and experimentation. API Development: Develop and maintain robust REST APIs using Python frameworks such as FastAPI . Database Management: Design and manage databases, including relational databases like MySQL and PostgreSQL , and NoSQL databases like DynamoDB or MongoDB . Code Quality: Write well-tested, maintainable code across frontend, backend, and integration layers. System Design: Participate in technical discussions around system design, performance tradeoffs, and long-term maintainability. Collaboration: Collaborate with cross-functional teams (Product, Design) to gather requirements, design solutions, and deliver high-quality applications. Technical Strategy: Contribute to technical decision-making regarding architecture, libraries, and tools to optimize performance and developer experience. Skills and Experience Bachelor’s degree in Computer Science, Software Engineering, or a related field, or equivalent professional experience. 3 to 6 years of professional software engineering experience in building production systems across both frontend and backend. Strong proficiency in Python; hands-on experience with the FastAPI REST framework & Database ORM’s . Highly proficient in JavaScript/TypeScript; hands-on experience building modern frontend applications with React . Must have a strong grasp of HTML5 and CSS3. Experience working with relational databases (MySQL, PostgreSQL) and NoSQL databases (DynamoDB, MongoDB). Proficiency in writing and executing unit tests using frameworks like pytest, React Testing Library, or similar tools. Experience integrating LLM APIs ( OpenAI , Anthropic , or Gemini ) into production applications. You understand how to manage context, prompts, and API costs. Strong familiarity wi