Backend Developer (Monetization Team)
We’re growing the Sheet Music Plus team and looking for a Senior Backend Developer to join our Monetization team and help build a dynamic, powerful ecosystem that empowers millions of creators worldwide through the world’s largest sheet music selection.
You will play a key role in maintaining platform stability, supporting ongoing product development, and improving delivery speed and quality across the product ecosystem.
Sheet Music Plus is a physical and digital sheet music store selling over 2.2 million licensed sheet music titles.
What is in for you?
- High load product: build tools used by millions of musicians globally - from hobbyists to professionals.
- Remote-first culture: work from anywhere.
- Radical ownership: you’ll see the direct impact of your work by owning decisions and contributing to product initiatives.
- Creative synergy: collaborate with passionate technologists, musicians, and designers in a mission-driven environment.
Key responsibilities
- Design and develop monetization features and payment processing solutions using PHP
- Integrate and optimize payment systems: Braintree, Stripe, App Store Billing, Google Play Billing
- Build and maintain integrations with internal services (analytics, warehouse, payment service, etc.)
- Generate and implement ideas to drive ARPU, LTV, and Revenue growth
- Optimize database queries, APIs, caching, and background jobs for performance and scalability
- Monitor production systems, resolve incidents, and reduce technical debt
- Collaborate closely with cross-functional teams to deliver product improvements.
Required experience
- 5+ years of experience with modern PHP (8.0+)
- Strong experience with Yii2
- Solid knowledge of MySQL: database design, profiling, indexes, query optimization
- 1+ year of experience integrating payment systems (Stripe, Braintree, App Store / Google Play Billing, or similar PSPs)
- Experience with webhooks, idempotency, refunds, and chargebacks
- Experience working with high-load production systems
- Understanding of PCI / PII compliance basics
- Experience with Git workflows, code reviews, CI/CD
- Ability to independently lead projects from design to production
- Strong prioritization skills: understanding when to deliver fast vs. when to build for long-term scalability
- English level B2+
Nice to have
- Experience with e-com projects
- Experience with Clickhouse
Benefits
Creativity every day: Make inspiring products for musicians, artists and creators – no day is the same.
Impactful work Influence the future of the music industry and change the lives of millions worldwide.
Work set up: We’ll make sure you’re set up for success with the right work equipment, whether that’s company-provided hardware or an equipment allowance.
Growth and development: Receive specialized training, language lessons, conferences and learning materials.
Team well-being: Support for your mental health and wellbeing, including confidential help during life’s tougher moments.
Muse Group empowers music makers
We create the worldʼs most popular apps for playing, recording and composing music. Through our innovative learning tools, expansive music catalogs and free open-source software, we make it easier for millions — from beginners to experienced musicians — to be creative every day. Our talented team of music lovers collaborates all over the globe, from Limassol to Seoul and Boston to Berlin.
We’re an ambitious company with the drive and culture of a startup — with many more exciting Muse Group developments to come. Hal Leonard, which joined Muse Group in 2023, is the world leader in sheet music publishing and music education. The company has a storied history of providing music learners with the very best methods and arrangements of popular music for over 70 years. Hal Leonard is also a major distributor of popular brands of instruments, gear, and software to the music trade worldwide.
