Senior Software Engineer - Typescript | React | Nextjs

Trivelta

Barcelona, Spain (Barcelona) permanent

Posted: March 5, 2026

Required Skills

Job Description

Trivelta builds the technology that powers a modern online sports betting & casino platform that operators use to launch and offer their own fully customized branded, legally compliant iGaming platforms and products that drive engagement, retention, and revenue. Through our proprietary sports-book and casino engine, we enable partners to offer real social interactions, predictive gameplay, and casino entertainment in one unified experience.

The Role

As a Senior Frontend Software Engineer, you’ll play a critical role in shaping the core product platform. This platform powers our sportsbook and casino experiences, ensuring a seamless, engaging, and high-performing user journey. You’ll translate product and design concepts into clean, production-ready code while building scalable systems that serve as the foundation for our growth. This role is ideal for someone eager to influence product direction, iterate quickly, and deliver experiences that reach thousands of users from day one.

Key Responsibilities

• Build and maintain user-facing features in React and TypeScript, optimizing for responsiveness, performance, and cross-device compatibility.

• Collaborate with designers and backend engineers to deliver polished interfaces and intuitive user flows that scale with our product.

• Establish and maintain a reusable component library and design system to accelerate development and ensure consistency across the platform.

• Lead technical discussions on frontend architecture, performance tuning, and best practices to support a rapidly evolving product.

• Contribute ideas that shape product direction and deliverables, balancing speed with quality in a fast-paced startup environment.

Qualifications

• Strong proficiency with React, TypeScript, and modern frontend tooling.

• Experience designing and implementing complex product flows and interactive user interfaces.

• Demonstrated ability to think about scalability, maintainability, and performance in frontend architecture.

• Proven track record of ownership across the full feature lifecycle in dynamic, startup-like environments.

Requirements

• Based in Barcelona

• Fluent in English

• Minimum 4 years of relevant experience

• EU work authorization required — no visa sponsorship

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