Senior Software Engineer (Node.js/React)
ZartisRemote
Full Time
Posted February 6, 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, with a focus on building reliable systems in the digital mental health sector. The role involves technical leadership, collaboration, and continuous improvement within a distributed, remote team.
Key Responsibilities
- Design, build, and operate Node.js backend services and React-based web and mobile applications.
- Take end-to-end ownership of features from conception to production deployment.
- Maintain and enhance legacy platforms through proactive support and incremental improvements.
- Contribute to system design and architectural evolution.
- Lead by example in trunk-based development, automated testing, CI/CD, and infrastructure-as-code practices.
- Ensure system performance, resilience, observability, security, and accessibility.
- 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 incident response and system reliability improvement efforts.
- Continuously improve systems and apply industry best practices in engineering and architecture.
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 database technologies such as PostgreSQL, and experience in delivering a web or native mobile application.
- Solid understanding of modern system architecture and the ability to contribute to its evolution.
- Commitment to quality, with experience shipping maintainable, scalable, and well-tested code.
- 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.
- Participation in the out-of-hours on-call rota and involvement in improving system reliability and incident response processes.
- Ability to design, build, and operate backend services, web apps, and mobile experiences that form the backbone of the platform.
- Experience taking end-to-end ownership of features, from idea through to production, with a strong sense of accountability and user impact.
- Experience ensuring the impact of legacy platforms through proactive maintenance, strategic incremental enhancements, and high-quality technical support.
- Ability to contribute to system design and architectural evolution.
- Experience leading by example in trunk-based development, automated testing, CI/CD, and infrastructure-as-code principles.
- Ability to take ownership of performance, resilience, observability, maintainability, security, and accessibility of systems.
- Experience continuously improving systems by applying a thoughtful and pragmatic approach to technical challenges.
Benefits & Perks
100% Remote Work
Monthly WFH allowance
Time allocated during the week for tech training (online courses, English classes, books, conferences, events)
Mentoring Program (opportunity to become a mentor or receive mentorship)
Career development program with 360º feedback
Access to Zartis Wellbeing Hub and Kara Connect platform with sessions with mental health professionals, nutritionists, physiotherapists, fitness coaches, and webinars
Flexible Working schedule
Participation in tech events, webinars, parties, online team-building games and contests
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