Senior Software Engineer (Node.js/React)

Zartis

Remote

Full Time

Posted April 7, 2026

Not Specified

Remote

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Job Description

A Senior Software Engineer responsible for designing, developing, and maintaining scalable full-stack applications using Node.js, React, and related technologies, while contributing to system architecture, ensuring quality, and mentoring team members in a remote, innovative environment focused on digital mental health solutions.

Key Responsibilities

Design, build, and operate backend services, web apps, and mobile experiences using Node.js, React, and React Native
Take end-to-end ownership of features from conception to production
Maintain and enhance legacy platforms through proactive support and incremental improvements
Contribute to system design and architectural evolution
Implement trunk-based development, automated testing, CI/CD, and infrastructure-as-code practices
Ensure system performance, resilience, security, accessibility, and maintainability
Collaborate across disciplines and mentor colleagues through code reviews and knowledge sharing
Drive understanding of user needs and business priorities to inform technical decisions
Participate in on-call rotations to improve system reliability and incident response

Requirements

At least 3 years of hands-on experience in full-stack software development in a product-oriented environment.
Proficiency in TypeScript, Node.js, and either React or React Native, as well as experience with database technologies such as PostgreSQL, and delivering a web or native mobile application.
Solid understanding of modern system architecture and the ability to contribute to its evolution.
Experience shipping maintainable, scalable, and well-tested code with a commitment to quality.
Ownership mentality with a focus on pragmatic delivery and continuous improvement.
Skilled in agile practices, data-informed decision-making, and building reliability.
Excellent communication and collaboration skills, including mentoring and inspiring peers, and building great relationships across disciplines.
Ability to participate in the out-of-hours on-call rota and contribute to improving system reliability and incident response processes.