Senior Staff Software Engineer

NewtonX (600+ clients like TikTok, Microsoft, Salesforce, Bain, Figma and many more) is a research intelligence company helping organizations make better business decisions and train better AI models through verified human intelligence. We turn specialized human expertise into reliable business decisions (e.g., product launches, marketing strategy, brand reputation tracking, M&A due diligence) and AI training data (frontier model improvements and evals). We have several million domain experts that we have sourced over the last few years (150+ industries including finance, legal, coding, tax & accounting, healthcare, semiconductors, cybersecurity, STEM and more). We have worked with AI Labs and Enterprises on topics ranging from sourcing senior electrical and SW engineers for a chip design benchmark to pediatricians and psychiatrists for clinical data to ML engineers and PhD-level statisticians proficient in 3D modeling. ABOUT THE ROLE We are looking for a Senior Staff Software Engineer with deep expertise in React on the frontend and Python/Django on the backend. You’ll help build and scale high-performing applications used by global teams, with a strong focus on delivering an exceptional user experience. As a Senior Staff Engineer, you will own organization-wide technical initiatives. WHAT WE’RE LOOKING FOR - 6+ years full-stack engineering experience - Strong React skills — modern React (hooks, Context API), reusable component libraries, building robust web apps across multiple projects - Strong Python/Django expertise — Django + Django Rest Framework, designing and consuming REST APIs - Solid experience in JavaScript (ES6+), TypeScript, HTML, CSS/SCSS - Experience building scalable systems (race conditions, idempotency, backpressure) - Strong SQL knowledge with relational databases (postgres) - Unit + integration testing mindset (Jest/React Testing Library, pytest/unittest) Comfortable with Git and Agile workflows - A strong, demonstrable commitment to developing secure software, including the ability to identify, defend against, and mitigate common application security vulnerabilities, especially those related to the OWASP Top 10. BONUS SKILLS (NICE-TO-HAVES) - State management (Redux, Zustand, Thunk) Responsive design with Material-UI, Bootstrap, or Tailwind - Cloud + infra experience: GCP, Kubernetes, Docker, Terraform Messaging/queueing systems (Pub/Sub, Kafka, RabbitMQ, SQS) - SOLID design principles WHAT YOU’LL DO - Lead development of React-based UIs that are performant, scalable, and user-friendly - Build and maintain Python/Django REST APIs and backend services - Collaborate on architecture, design decisions, and code reviews - Maintain and improve test coverage across the stack - Debug, resolve technical debt, and improve code quality - Contribute to technology/tooling choices and best practices Mentor teammates and help shape engineering processes WHAT WE OFFER - Excellent medical, dental, and vision insurance. - 401k match with immediate vesting. - Generous Paid time off: vacation, holidays, sick, and parental leave. - A diverse, collaborative, and positive culture where we invest in and celebrate each other’s success. Flexible work environment where we work hard but have fun (happy hours, team projects, and retreats). NewtonX is proud to be an equal opportunity workplace. We do not discriminate based upon race, religion, color, national origin, sex, sexual orientation, gender identity/expression, age, status as a protected veteran, status as an individual with a disability, or any other applicable legally protected characteristics.