Senior FullStack Engineer-- Onsite-- Seattle,WA-- Direct client

We are looking for a highly skilled Senior Full Stack Engineer to design, develop, and deliver scalable, secure, and high-performing web applications. The ideal candidate has strong expertise across front-end and back-end technologies, enjoys end-to-end ownership, and thrives in collaborative, fast-paced environments.

Key Responsibilities

• Design, develop, and maintain end-to-end web applications using modern front-end and back-end technologies
• Build scalable, reusable UI components using React
• Develop robust backend services and APIs using Java, Node.js, or similar technologies
• Design and integrate RESTful APIs and backend services
• Work closely with product managers, UX designers, and translate requirements into technical solutions
• Ensure application performance, security, scalability, and reliability
• Participate in architecture and design discussions; contribute to technical decisions
• Write clean, maintainable, well-tested code following best practices
• Review code, mentor junior engineers, and uphold engineering standards
• Support production releases, troubleshooting, and on-call rotations as needed

Required ualifications

• 5 8 years of experience in full-stack software development
• Strong experience with React, JavaScript (ES6+), HTML, CSS
• Backend experience with Java (Spring Boot) or Node.js
• Strong understanding of REST APIs, microservices, and distributed systems
• Experience working with relational and/or NoSQL databases (PostgreSQL, DynamoDB, etc.)
• Familiarity with authentication, authorization, and security best practices
• Experience with Git, CI/CD pipelines, and automated testing
• Solid understanding of cloud-native application development

Preferred Qualifications

• Experience with TypeScript
• Exposure to Next.js or modern frontend frameworks
• Experience with AWS (EC2, ECS/EKS, Lambda, RDS, DynamoDB, S3)
• Familiarity with containerization (Docker, Kubernetes)
• Experience with event-driven architectures (Kafka, SNS/SQS)
• Background in retail, POS, or enterprise systems

Soft Skills

• Strong ownership mindset and accountability
• Excellent communication and collaboration skills
• Ability to balance speed with quality
• Experience working in agile / Scrum environments
• Passion for learning and improving engineering practice