Senior Frontend Engineer

Hybrid, Bucharest, Romania

JOB OVERVIEW

Legion is a high-performance, data-driven enterprise platform that supports complex forecasting, scheduling, and optimization capabilities. It also provides the services required by our web and mobile frontend applications.

RESPONSIBILITIES AND DUTIES

As a Senior Frontend Software Engineer, you will be a member of the team responsible for the implementation and evolution of these applications.
You will need to be able to write secure, efficient, enterprise-quality code and have a deep understanding of the techniques and technologies necessary for scalability and performance.
Plan and conduct architecture sessions, design and build enhancements and extensions, and create plans for integration and unit testing.
Collaborate independently across frontend, backend, product, design, and quality engineering teams to resolve dependencies and make well-informed technical decisions.
Design and maintain highly available, reliable, and performant frontend applications that meet defined service-level agreements (SLAs) and service-level objectives (SLOs).
Manage difficult situations in a calm, structured, and timely manner.
Remain adaptable and prepared to respond effectively as priorities and requirements change.
Participate in Agile and Scrum ceremonies and contribute to planning, estimation, delivery, and continuous improvement.
Apply AI-assisted software development lifecycle (AI SDLC) practices across requirements, design, coding, testing, documentation, and automation to improve delivery velocity and quality.
Please note that this role involves active participation in an on-call rotation for critical support activities.

REQUIRED SKILLS AND QUALIFICATIONS

5–7 years of experience working with React and related frontend technologies.
Experience with React is essential. Experience with AngularJS and migrating AngularJS applications to React is preferred.
Strong experience with HTML5, CSS, JavaScript, TypeScript, and responsive, cross-browser frontend development. Familiarity with Bootstrap and jQuery is helpful when working with legacy applications.
Experience integrating frontend applications with REST APIs using modern state-management, data-fetching, caching, and error-handling patterns (e.g., Redux, Zustand, or TanStack), and writing automated frontend and end-to-end tests with Playwright.
Experience building software products and managing the complexities of multiple configurations in a cloud-based product, rather than consulting or webpage/portal development.
Bachelor’s or master’s degree in computer science, engineering, mathematics, or a similar field.

PREFERRED QUALIFICATIONS AND ATTRIBUTES

Experience with mobile application development, including native iOS or Android applications; familiarity with React Native is a plus.
Our application runs on AWS, so experience with containerization and cloud deployments is preferred.
Familiarity with Java-based backend development and working with backend services and APIs is desirable.

ABOUT LEGION

Join Legion's mission to turn hourly jobs into good jobs. We're a mission-driven team seeking exceptional talent to propel this vision. Embrace a culture that's collaborative, fast-paced, and entrepreneurial. With us, you'll grow your skills, work closely with experienced executives, and contribute significantly to our mission.

Our award-winning AI-native workforce management platform is intelligent, automated, and employee-centric and proven to deliver 13x ROI. We help labor-intensive organizations maximize labor efficiency and employee engagement simultaneously.

Legion has earned recognition for its innovation, including spots on the Inc. 5000 list, Forbes’ Next Billion Dollar Startups, and awards for our AI technology. Backed by leading investors such as Norwest Venture Partners, Stripes, First Round Capital, XYZ Ventures, Webb Investment Network, Workday Ventures, and NTT DOCOMO Ventures, we're making real change.

If you're ready to make an impact and grow your career, Legion is where you belong. Join us in making hourly work rewarding and fulfilling.