Senior Frontend Software Engineer(React.js)

At Avenga, we believe that human creativity empowers technology that matters. Operating globally, our 6000+ specialists provide a full spectrum of services, including business and tech advisory, enterprise solutions, CX, UX and Ul design, managed services, product development, and software development.

This is the job

We are looking for a Senior Frontend Engineer (React) to join our project with a leading US product company in the restaurant technology industry. The client develops a cloud-based platform that powers digital ordering, payments, delivery, and guest engagement for hundreds of well-known restaurant brands, processing millions of transactions every day.

As a Senior Front-End Engineer, you will work on customer-facing products used at scale, helping to build modern, responsive, and reliable web applications. You will collaborate closely with cross-functional teams, contribute to technical decisions, and help deliver high-quality software in a fast-paced product environment.

This is you

• 5+ years of commercial experience in Front-End development
• Strong hands‑on experience with React and Next.js, with both being the primary technologies used in recent commercial projects
• Experience with Node.js, NPM, Vite, Git, and CI/CD principles
• Experience with front-end state management solutions
• Experience building and maintaining client‑facing APIs and SDKs
• Experience writing automated tests (unit, component, integration, and end‑to‑end)
• Solid understanding of front‑end architecture, design patterns, and application structure
• Strong communication skills and ability to work in a collaborative team environment

Nice‑to‑have skills:

• Experience building or maintaining component libraries and design systems
• Experience collaborating closely with UX/UI teams
• Experience leading technical initiatives or acting as a Lead Developer
• Experience providing L2 production support

This is your role

• Design, develop, and maintain scalable React and Next.js applications used by millions of end users
• Build clean, maintainable, and well‑tested front‑end solutions
• Develop and maintain customer‑facing APIs and SDKs
• Collaborate with designers, product managers, back‑end engineers, and UX teams to deliver new features
• Participate in code reviews and contribute to engineering best practices
• Provide thoughtful and constructive feedback to teammates while actively incorporating feedback from others
• Take ownership of features throughout the entire development lifecycle
• Work effectively in a small, collaborative engineering team
• Communicate technical decisions clearly, advocate for engineering needs, and provide regular updates to stakeholders
• Participate in an L2 support rotation (approximately once every 8-9 weeks)
• Continuously improve application performance, maintainability, and user experience

The team collaborates closely with colleagues in the United States, so candidates are expected to have a daily overlap with the US time zone and be available until approximately 1:00 PM EST (around 8:00-9:00 PM Istanbul time) during the initial period. Over time, the required overlap is expected to become more flexible and move closer to 12:00 PM EST.

What awaits you at Avenga?

At Avenga, everyone matters. We provide equal opportunities in recruitment, career development, and leadership, regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to fostering a work environment where our diverse community of employees, candidates, and business partners actively shapes our growth. By bringing together people from different backgrounds and experiences, we build a workplace where everyone feels free to be themselves while honoring the boundaries of others.