Senior Staff Software Engineer

NewtonX · New York City

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About NewtonX

NewtonX is a B2B insights company trusted by the world's most innovative companies to make high-stakes decisions with confidence. We combine a verified network of business professionals with AI-powered research tools to deliver research intelligence faster, more precise, and more defensible than traditional methods.

Our clients include Google, Microsoft, TikTok, DoorDash, Stripe, and Coinbase. Our research has been cited by Fortune, Forbes, TechCrunch, Adweek, and the Wall Street Journal.

NewtonX has raised $47M from investors including Two Sigma Ventures, Third Prime, XFund, and Citi Ventures.

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.

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