Full-Stack Senior

Senior Full Stack Engineer (Frontend Focus)

Location: Sarajevo, BiH (Hybrid / Sarajevo HQ)
Type: Full-time
Sector: Technology / E-commerce Infrastructure

About the Client

Our client is a fast-growing, AI-driven software group on a mission to power the infrastructure of modern global enterprises. With over $200M in venture funding and 16 successful acquisitions in just four years, they build and scale innovative products that enable businesses to thrive globally.

With a high-performing team spread across Sarajevo, London, and Milan, they combine diverse global perspectives to create software that handles massive scale. They offer a vibrant, product-led culture where engineering excellence is at the forefront.

The Role

We are seeking a Senior Full Stack Engineer with a strong Frontend focus. In this pivotal role, you will elevate frontend engineering practices while maintaining a holistic view of the entire codebase.

This position is ideal for a technical leader who is not only hands-on in building scalable, high-quality applications but is also passionate about mentoring junior and mid-level engineers, guiding projects from inception, and shaping the long-term technical direction.

What You'll Do

• Lead Frontend-heavy Development: Drive development across multiple products while maintaining a full-stack perspective.
• Mentorship & Leadership: Guide junior and mid-level developers through code reviews, pair programming, and active knowledge sharing.
• Standard Setting: Define and implement best practices for frontend development to ensure quality, maintainability, and scalability.
• Architectural Contribution: Contribute to architectural decisions and provide a holistic view of the codebase across both frontend and backend layers.
• Innovation: Drive the creation of project templates and starter frameworks to accelerate new initiatives.
• Full Ownership: Take ownership of projects ranging from greenfield builds to complex rewrites and migrations.
• Cross-functional Collaboration: Work closely with product managers, designers, and backend engineers to deliver seamless end-to-end features.

What Were Looking For

• 6+ years of experience as a Full Stack or Frontend-focused Engineer.
• Technical Mastery: Deep proficiency in JavaScript/TypeScript and modern frameworks (React, Vue.js).
• Backend Proficiency: Solid experience with technologies such as Node.js, Express, NestJS, or similar.
• System Knowledge: Strong understanding of APIs, databases (SQL/NoSQL), and cloud platforms.
• Mentorship Track Record: Proven ability to guide and grow less experienced engineers.
• Project Scaffolding: Experience building applications from scratch and setting up project templates.
• Communication: Strong English communication skills and the ability to collaborate across distributed global teams.

Preferred Qualifications

• Familiarity with GraphQL.
• Previous experience leading frontend initiatives in SaaS or product-led companies.
• A keen interest in performance optimization and system scalability.
• Experience within the Shopify ecosystem is a significant plus.

Why You'll Love Working Here

• Impact: Your work directly influences products used by businesses worldwide.
• Culture: Join a team that values ownership, continuous learning, and genuine collaboration.
• Environment: A vibrant Sarajevo office hub with a flexible hybrid setup.
• Growth: Opportunities to work across a diverse portfolio of global products and lead innovation.