Senior Full Stack Engineer

At Sapia.ai, we're pioneering the future of ethical, AI-powered hiring. With millions of candidates engaging with our Chat Interview every year, we are redefining how talent is discovered, assessed, and nurtured. Our products are trusted by some of the world's most innovative companies, and we're just getting started.

Why this role exists: We’re building the world’s first fully AI-led hiring platform, and great software is at the heart of making that experience feel effortless and human. This role exists to help us scale that magic—through clean, resilient code and thoughtful systems that power millions of candidate conversations every day.

You will be joining a fast-paced, innovation-driven team where ownership is high and learning never stops. It’s a role for builders who thrive on curiosity, care about craft, and want to help shape the future of fair hiring.

What You'll Do:

• End-to-End Product Ownership: Design (contribute to design process), build, test, and deploy entire features across the stack, from our React/TypeScript frontend to our backend services.
• Architect for Scale: Evolve our core application architecture, making key decisions to ensure our platform is performant, reliable, and scalable on AWS.
• AI-Powered Feature Development: Collaborate closely with our Machine Learning team to seamlessly integrate cutting-edge NLP and generative AI capabilities into the product.
• UI/UX Craftsmanship: Work hand-in-hand with product and design to translate vision into technically sound solutions and an exceptional user experience.
• Technical Mentorship: Elevate the entire engineering team by sharing your expertise, mentoring other engineers, and championing software engineering best practices.
• Accelerate with AI: Leverage AI assistant tools to accelerate development and debugging, while applying critical judgment to ensure all code meets our high standards for quality, security, and integrity.
• Adaptable & Curious: In a tech landscape that evolves at lightning speed, you have a deep-seated curiosity and a drive to continuously learn. You are quick to adapt, embracing new tools and technologies to solve problems and find a way through any challenge.

What You Bring:

• 3+ years in a Full Stack Engineer or similar role, with a track record of shipping and maintaining complex web applications in a production environment.
• Familiar with both RESTful and GraphQL API and experience designing, building, and maintaining APIs that are scalable and secure.
• Understanding of microservices architecture and distributed systems and how to design services that are modular, maintainable, and resilient.
• Hands-on experience with the AWS platform. Comfortable working with core services like ECS for container orchestration, Lambda, and various database services.
• Experience with NoSQL databases (e.g., MongoDB), with strong SQL skills considered a bonus.
• An execution-obsessed mindset and a pragmatic approach to problem-solving, with a bias for action to deliver results in a fast-paced environment.
• A deep sense of ownership and accountability; you care about the entire lifecycle of a feature, from idea to impact.
• You know how to move fast by leveraging AI tools like Cursor, Claude, or Code ChatGPT to generate code, troubleshoot issues, and accelerate development workflows.
• Good to Have: Experience with caching services like Redis or search platforms like Elasticsearch to optimise performance and data retrieval.
• Hands-on experience building AI agents, chatbots, or conversational flows using LLMs.
• Python skills for data processing, scripting, or working with AI/ML libraries.
• Experience with CI/CD pipelines and DevOps practices (Docker, GitHub Actions, etc.).

How we hire: We believe there’s more to you than your CV. So, we start with a chat interview, our very own, designed to uncover your potential and give you the space to share who you are in your own words. You’ll answer 5-6 role-relevant questions over chat and submit a short video answer. It’s untimed and mobile-friendly. Afterwards, you’ll get personalised insights from the interview, based on your responses. Our hiring team will reach out to you directly if they’d like to move forward.