Senior JavaScript Developer

This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior JavaScript Developer (MarTech) in Bulgaria. This role is an exciting opportunity to build and maintain high-performance marketing technology platforms in a fast-paced, international environment. As a Senior JavaScript Developer, you will primarily focus on backend development while contributing to full-stack projects that power landing pages, experimentation platforms, and analytics tools. You will work with modern technologies such as Node.js, TypeScript, MongoDB, Kafka, and ClickHouse, designing REST-like APIs and ensuring system reliability and scalability. The position offers collaboration with distributed teams, ownership over CI/CD pipelines, and involvement in performance optimization and testing strategies. Your contributions will directly impact marketing automation capabilities and the performance of high-traffic digital products. Accountabilities Lead backend and full-stack development efforts for marketing technology platforms, including REST-like APIs and experimentation tools. Maintain and optimize high-performance landing pages platforms with features like A/B testing and multi-armed bandits. Develop and maintain CI/CD pipelines using tools such as GitHub Actions. Build and support systems using Node.js, TypeScript, MongoDB, Kafka, ClickHouse, and Cloudflare Workers. Write unit and integration tests to ensure robust and reliable software delivery. Collaborate with cross-functional teams to design scalable, maintainable, and high-load applications. Ensure backend performance, stability, and adherence to modern web architecture best practices. Requirements 5+ years of experience in JavaScript/TypeScript development with a strong backend focus. Deep understanding of modern web application architecture and REST-like APIs. Hands-on experience with Node.js, TypeScript, and backend frameworks for high-throughput applications. Familiarity with Docker and container orchestration for development and deployment. Knowledge of frontend basics: HTML, CSS, layout, and vanilla JavaScript. Experience with CI/CD tools and maintaining pipelines (e.g., GitHub Actions). Experience working with NoSQL databases and query optimization principles. Ability to develop, maintain, and optimize high-load systems with a focus on performance and reliability. Excellent communication skills and ability to work with international, distributed teams. Benefits Fully remote work opportunity with global flexibility. 28 calendar days of vacation per year plus 7 wellness days for personal time or recovery. Referral bonuses up to $5,000 for successful candidate recommendations. 50% coverage for professional training, conferences, and international meetings. Corporate discount for English lessons. Health benefits or reimbursement up to $1,000 annually for medical expenses. Reimbursement for home or coworking workspace setup up to $1,000 every 3 years. Access to an internal gamified gratitude system for peer bonuses redeemable for merchandise or activities. Why Apply Through Jobgether? We use an AI-powered matching process to ensure your application is reviewed quickly, objectively, and fairly against the role's core requirements. Our system identifies the top-fitting candidates, and this shortlist is then shared directly with the hiring company. The final decision and next steps (interviews, assessments) are managed by their internal team. We appreciate your interest and wish you the best Why Apply Through Jobgether? Data Privacy Notice: By submitting your application, you acknowledge that Jobgether will process your personal data to evaluate your candidacy and share relevant information with the hiring employer. This processing is based on legitimate interest and pre-contractual measures under applicable data protection laws (including GDPR). You may exercise your rights (access, rectification, erasure, objection) at any time. #J-18808-Ljbffr