Full Stack Developer (Node.js, React)

Why This Role Matters

We’re looking for a Principal Engineer to lead the architecture and execution of our GenAI-powered, self-serve marketing platforms. You will work directly with the CEO to shape, build, and scale products that change how marketers interact with data and AI. This is intrapreneurship in action — not a sandbox innovation lab, but a real-world product with traction, velocity, and high stakes.

What You'll Do

• Co-own product architecture and direction alongside the CEO.
• Build GenAI-native, full-stack platforms from MVP to scale — powered by LLMs, agents, and predictive AI.
• Own the full stack: React (frontend), Node.js/Python (backend), GCP (infra), BigQuery (data), and vector databases (AI).
• Lead a lean, high-caliber team with a hands-on, unblock-and-coach mindset.
• Drive rapid iteration with rigor, balancing short-term delivery with long-term resilience.
• Ensure scalability, observability, and fault tolerance in multi-tenant, cloud-native environments.
• Bridge business and tech — aligning execution with evolving user and market insights.

What You Bring

• 8–12 years of experience building and scaling full-stack, data-heavy or AI-driven products.
• Fluency in React, Node.js, and Google Cloud (Functions, BigQuery, Cloud SQL, Airflow, etc.).
• Hands-on experience with GenAI tools (LangChain, OpenAI APIs, LlamaIndex) is a bonus.
• Track record of shipping products from ambiguity to impact.
• Strong product mindset — your goal is user value, not just elegant code.
• Architectural leadership with ownership of engineering rigor and scaling best practices.
• Startup or founder DNA — you’ve built things from scratch and know how to move fast without breaking things.

Who You Are

• A former founder, senior IC, or tech lead who’s done zero-to-one and 1-to-n scaling.
• Hungry for ownership and velocity — frustrated by bureaucracy or stagnation.
• You code because you care about solving real problems for real users.
• You’re pragmatic, hands-on, and grounded in first principles.
• You understand that great software isn't just shipped — it's hardened, maintained, and evolves with minimal manual effort.
• You’re open to evolving into a founding engineer role with influence over the tech vision and culture.

What You Get

• Equity in a high-growth product-led startup.
• A chance to build global products out of India with full-stack and GenAI innovation.
• Access to high-context decision-making and direct collaboration with the CEO.
• A tight, ego-free team and a culture that values clarity, ownership, learning, and candor.

Why YOptima?

YOptima is redefining how leading marketers unlock growth through full-funnel, AI-powered media solutions. As part of our growth journey, this is your opportunity to own the growth charter for leading brands and agencies globally and shape the narrative of a next-generation marketing platform.

Ready to lead, build, and scale?

We’d love to hear from you.

Job Overview:

We are seeking a skilled Senior Python Full Stack Developer with a strong background in application architecture and design. The ideal candidate will be proficient in Python, with extensive experience in web frameworks such as Django or Flask along with front-end technologies- React, JavaScript. You'll play a key role in designing scalable applications, collaborating with cross-functional teams, and leveraging cloud technologies.

Key Responsibilities:

• Backend Development:
• - Architect, develop, and maintain high-performance backend systems using Python or Golang.
• - Build and optimize APIs and microservices that power innovative, user-focused features.
• - Implement security and data protection measures that are scalable from day one.
• - Collaborate closely with DevOps to deploy and manage applications seamlessly in dynamic    cloud environments.
• Frontend Development:
• - Work hand-in-hand with front-end developers to integrate and harmonize backend systems with React-based applications.
• - Contribute to the UI/UX design process, ensuring an intuitive, frictionless user experience that aligns with the startup’s vision.
• - Continuously optimize web applications to ensure they are fast, responsive, and scalable as the user base grows.

Qualifications:

• Bachelor’s or Master’s degree in Computer Science, Engineering, or a related field.
• 7+ years of experience in backend development, with proficiency in Python and/or Golang.
• Strong experience in front-end technologies, particularly React.
• Familiarity with cloud platforms (AWS, GCP, or Azure) and containerization tools like Docker and Kubernetes.
• Knowledge of Apache Spark is highly preferred.
• Solid understanding of database technologies, both relational (e.g., PostgreSQL, MySQL) and NoSQL (e.g., MongoDB, Cassandra).
• Experience with CI/CD pipelines and automated testing frameworks.
• Excellent problem-solving skills and a proactive attitude toward tackling challenges

Job Description :

- Strong understanding of the Ruby programming language and Rails framework

- Proficiency in Javascript including experience with React, Angular or Vue

- Database understanding (Postgres/MySQL)

- Previous experience maintaining production applications

- Focus on writing clear, maintainable, tested code.

Skills Required :

- Navigating and understanding a large codebase

- Experience with Git continuous integration and regular deployments

- Understanding and appreciation for UX and usability

- Excellent communication skills and diligent ability to contribute to the team by performing code reviews,

- Writing tests using Rspec and Capybara.

• Efficiently realize the UI/UX needs and deliver excellent front-end features.
  
• Maintain quality of our SAAS platform and ensure responsiveness of applications/cloud-run services.
  
• Collaborate with the rest of the teams to design and launch additional/new features and services.
  
• Develop and maintain the source codes.
  
• Optimize and stabilize the overall service architecture (front) from both engineering and commercial point of view.

• Should be highly skilled in the MERN (MongoDB, Express, React, Node)stack.
  
• Should have knowledge of different React Hooks, and should be able to develop custom hooks.
  
• Should have an understanding of making good-looking plots, an understanding of D3.js is preferred.

• Solve complex performance problems and architectural challenges
• Troubleshoot, test and maintain the core product software and databases to ensure strong optimization and functionality.
• Help team in technical challenges
• Code review and deployment
• Technical documentations
• Thorough understanding of React.js and its core principles.
• Familiarity with Restful APIs.
• Build efficient, testable, and reusable PHP modules.
• Should be able to understand the requirements & Develop web application.
• Ability to work on multiple projects at the same time and complete tasks in a timely manner.

Essential duties and responsibilities include the following. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions.

• Work on a remote cross-functional team where you’ll play a critical role in designing, planning, development, deployment and observing your code in production.   
• Develop high performance, highly scalable and accessible web applications. Our web app is used by over 20 million educators, students and parents worldwide.  
• Meet tight deadlines in a rapid application development environment.  
• Collaborate with Product Management, Design, and Operations teams to create and deliver tested features to production.  
• Collaborate with specialists across web, mobile, and operations to achieve a better user experience for our product.  
• Be able to assess and bring in industry information into your decisions and learn new technologies: AWS is releasing new tools every day, there are new open source libraries to vet and you will be a party to helping us vet and pick the best tool for the job.  
• Be willing to work in any area of the codebase if needed, this can include JavaScript/TypeScript/Node, PHP, Java or other technologies.  
• Help staff, build, and form the culture around a team of 5 engineers, a product manager, designer, QAs and associated supporting roles.

Qualifications include:

• Strong CS fundamentals including familiarity with data structures and especially the asynchronous challenges that face JavaScript developers today.   
• Experience developing in at least 2 server side languages (PHP, node.js, …)  
• Experience developing in at least 1 client side JS framework (ReactJS, Angular, …)  
• Experience testing software in alignment with the Test Pyramid.  
• Experience with datastores, either SQL (MySQL preferred) or NoSQL, and the ability to talk deeply about them.  
• Able to identify the source of complex problems occurring as a result of multiple systems interacting (experience with observability tools such as datadog/newrelic is a plus).   
• Experience working on a team of 5 engineers plus supporting roles (e.g. QA, design, etc), preferably as a Senior Software Engineer.  
• Experience with code review, being able to sign-off on another team member’s code ensuring high quality standards.  
• Be self-sustained even when tackling the highest profile, most difficult work across the organization.  
• Willingness to accept responsibility and be accountable not only for your own work but the work of the team as a whole.  
• Experience working with other people’s code, how to dig into it and make tactical changes with minimal side effects.  
• A solid understanding of how to break down user stories and give estimates that include accessibility and security requirements.  
• Be able to see roadblocks far ahead, across many vectors of risk  
• Be a true team player! Ensuring their knowledge and expertise is shared amongst other team members and even cross-team and be willing to seek out opportunities to mentor teammates.  
• A commitment to learning about anything you don’t know on your own and without much supervision.  
• Superior communications, organization and relationship building skills — you’re going to be working on cross-team efforts, so this is essential.  
• Self-motivation as well as ability and desire to learn new technologies, applications, processes, and environments.  
• A belief that delivering code to production is just one step in the process. Observing and owning the code you wrote goes hand in hand with construction.  
• A desire to take on whatever challenge is most important. This could be tackling something you are familiar with, or it could require a deep dive into a whole new world. The key is having the right attitude.   

• 2+ years of experience participating in the delivery of technology services.
• A proven ability to learn new applications & innovate in technology
• Strong Experience in technologies like Node, Webservices and Microservices
• Experience with cloud components and services and containerization technologies is desirable
• Exposure to ReactJS mandatory
• Experience working with multiple types of datastores: Mongo DB, SQL
• Experience in integrating, designing and developing solutions is desirable
• Experience with CI/CD and TDD is desirable
• Frameworks - Express , Hapi , feathers
• Strong knowledge in Javascript