Backend Developer

Hello, all. StoneLab is a rapidly growing startup which possesses and advances novel techs for digital bio-healthcare and lifestyle solutions, with a focus on digital diagnostics (bio-analytics) and digital therapeutics (mental health). As our unique products move toward broader global market adoption, we are looking for SW professionals who enjoy observing our contribution to real-world healthcare and lifestyle innovation. With the reinforcement of our service capabilities proportional to the increasing market, we are currently hiring for the following full-time positions: Mid-Level Backend DeveloperSenior Backend Developer We welcome applications from candidates with diverse professional backgrounds who meet the role requirements. Responsibilities Design, develop, deploy, and maintain backend services and web applicationsBuild scalable and reliable APIs, ensure application performance, scalability reliabilityImplement secure authentication, authorization, and API security best practicesContribute to infrastructure, deployment pipelines, and cloud-based environmentsWrite clean, maintainable, and well-tested code Requirements 3+ years of backend development experience.Strong experience with REST APIs and relational databases.Experience working with cloud platforms such as AWS, Google Cloud, or Azure.Experience with enterprise-grade applications and production environments.Solid understanding of authentication and authorization systems (OAuth2, JWT, session management, etc.)Experience with Docker and containerized environments.Experience with Infrastructure as Code tools such as Terraform.Familiarity with caching technologies and strategies (Redis, Memcached).Experience optimizing API and database performance using profiling and benchmarking tools.Good understanding of backend security practices, including: API security, Secure credential and secret management, HTTPS/TLS and secure communication, rate limiting, input validation, and access control Experience with CI/CD pipelines and automated deployment workflows Preferred Qualifications Experience with monitoring and observability tools.Experience with Python-based frameworks such as Django and FastAPI. Why Join StoneLab? Collaborate on impactful digital healthcare and lifestyle technology products.Contribute to AI solutions with potential real-world impact.Take on challenging technical problems in a collaborative startup environment.Grow through continuous learning, technical ownership, and professional development.Enjoy flexible working hours and employee benefits.Receive compensation based on role, experience, qualifications, and internal compensation standards. How to Apply Please apply through LinkedIn and refer to stonelab.aiYou may also send your CV, portfolio, publications, or GitHub profile to: careers@stonelab.aiQualified candidates will be contacted by email regarding the next steps in the hiring process. Privileges Housing support (up to KRW 20 mil for deposit, 50% of a monthly rent) and meal support are provided in accordance with internal regulation.Annual monthly health checkup and personalized clinical program support. Coverage of medical insurance and employee accident insurance.Access to high quality R&D resources for retraining: latest equipment provision (mac, 4K monitor, AI service subscription, etc.)Seminar/conference/fair participation and travel support (accommodation, transportation, expenditures)Engagement in workshops and communication with our worldwide research partners. Equal Opportunity Statement StoneLab is committed to fair and job-related hiring practices. Hiring decisions are based on qualifications, skills, experience, and business needs. We do not make hiring decisions based on characteristics unrelated to job performance or any status protected by applicable law.