Freelance Next Js Developer Jobs in Seattle, WA (NOW HIRING)

At Serko, we believe something incredible happens when people come face-to-face. That's why we're on a mission to engineer a frictionless, next-generation business travel marketplace. We don't just manage travel; we are leveraging advanced AI and cutting-edge tech to eliminate the complexity of global movement.

When you join Serko, you join a global collective of passionate technologists who show up as their true selves to build world-class products. With established hubs across New Zealand, Australia, North America, India and China - your code and ideas will impact millions of corporate travelers worldwide.
If you're ready to challenge the status quo and build the future of travel tech, your next journey starts here.

We're hiring 2 x Senior Full Stack Engineer to own the end-to-end development of our next-gen AI products.

Requirements

You'll bridge the gap between complex AI capabilities and beautiful user experiences, developing the customer-facing features, high-performance APIs, and reliable backend services that make intelligent, autonomous workflows reality.

• Build Meaningful Experiences: Partner closely with a cross-functional team of designers, product managers, and ML engineers to shape and deliver thoughtful, high-quality AI-powered user experiences.
• Bridge Frontend & Backend: Co-create and refine full-stack features, utilizing React/Next.js for intuitive frontends and Python or Node.js to power robust, reliable backend services.
• Bring AI to Life: Integrate LLM APIs and innovative agentic frameworks into fluid product features-crafting interactive streaming UIs, clear tool-call results, and helpful agent status displays.
• Design Accessible Connections: Cultivate and maintain clean REST and/or GraphQL APIs that seamlessly support user data, smooth session management, and helpful agent interactions.
• Champion Quality Together: Write thoughtful unit, integration, and end-to-end tests to ensure product excellence, and engage in constructive, supportive code reviews that help the whole team grow.
• Support Team Resilience: Contribute to a shared, collaborative on-call rotation, working as a team to support production systems, document thoughtful learnings, and keep our platform running smoothly.
• Shape Our Technical Future: Share your unique perspective in architectural discussions and contribute technical proposals that help our systems scale sustainably.
  

• A Passion for Full-Stack & AI: Deep, hands-on experience building full-stack applications, with a special focus on native AI stack development.
• Core Technical Comfort: A strong foundational comfort with TypeScript (React, Next.js) on the front end, paired with Python and SQL on the backend.
• AI Integration Experience: Experience successfully bringing AI to life in production, specifically by integrating with LLM APIs or crafting intuitive AI-powered features.
• Thoughtful System Design: A clear understanding of RESTful API design, database management (such as PostgreSQL or Redis), and cloud ecosystems.
• An Eye for Real-Time UX: Familiarity with creating smooth, real-time user experiences using streaming responses (like SSE or WebSockets) so our AI feels fluid and responsive.
• DevOps Awareness: Comfort collaborating on continuous integration and delivery (CI/CD), containerization (Docker), and smooth cloud deployments.
• Empathetic Communication: Highly developed communication skills and a natural ability to listen, share ideas, and partner effectively within a cross-functional team.

• If you have experience in any of these areas, that's wonderful! If not, we are excited to support your learning on the job:
• Familiarity with agentic frameworks like LangChain or LangGraph.
• Exposure to building vector search or RAG-based capabilities.
• A background or interest in crafting interactive interfaces like chat, copilots, or workflow automation tools.

Benefits

At Serko, we aim to create a place where people can come and do their best work.  This means you'll be operating in an environment with great tools and support to enable you to perform at the highest level of your abilities, producing high-quality and delivering innovative and efficient results. Our people are fully engaged, continuously improving, and encouraged to make an impact.

Some of the benefits of working at Serko are:

• A competitive base pay
• Medical Benefits
• Discretionary incentive plan based on individual and company performance
• Focus on development: Access to a learning & development platform and opportunity for you to own your career pathways
• Flexible work policy
• The pay range is between $152,000 - $230,000 USD as a base salary offering annually.
  

A Note on Work Authorization: Applicants must be authorized to work for any employer in the U.S. At this time, we are unable to provide sponsorship or assume sponsorship for employment visa status (e.g., H-1B visa status).