Sr. Backend Software Engineer

Job description

**About Firework** Join Firework – Where Innovation Meets Impact Firework is redefining the future of commerce as an AI and video commerce company — combining cutting-edge technology, an exclusive network of enterprise brands and retailers, and a first-mover position to win the agentic commerce race. We've built the world's most advanced and largest video commerce platform, trusted by global brands and leading retailers. But we're more than software — our compounding network effect grows stronger with every partner we add, bringing the energy of in-store experiences online and transforming how businesses engage, convert, and build lasting customer relationships at scale. Having raised over $235M to date, led by investors such as SoftBank Vision Fund 2, and operating at global scale, we offer unparalleled opportunities to solve complex challenges and drive meaningful impact in the future of connected commerce. If you're curious, ambitious, and energized by big ideas — Firework is the place to grow, lead, and shape what comes next. Together. **Summary** Our Engineering team is growing! We’re seeking a skilled Sr. Backend Engineer to join our global team, contribute deep technical expertise and scale our high-performance backend systems. ### What you’ll be doing - Work closely with product managers, designers, and the rest of the engineering team to design, spec, and build elegant and scalable solutions across multiple platforms - Design and create new API's in the Elixir Phoenix framework to be used in our core products - Writing optimized PostgresQL and Cassandra queries and creating high performance indices - Working with in-memory data stores, such as Redis, to improve scalability and responsiveness - Debug issues across the entire stack using logging and monitoring tools - Review code by your peers, offering help and insight from your experience - Improve engineering standards, tooling, and processes - Ensure coherence of all aspects of projects as an integrated system and uphold overall technical quality - Strategize and develop ideas for new programs, products, or features by monitoring industry developments and trends - Define all aspects of development from appropriate technology and workflow to coding standards ### We’ll be excited if you have - Bachelor’s degree in computer programming, computer science, or a related field; advanced degree is a plus - 4+ years of experience with Elixir designing and building high-performance RESTful web services serving billions of requests per day - High-level experience with SQL infrastructure and data modeling - Comfortable with change: ability to demonstrate comfort with ambiguity, adapt quickly and be effective in new situations in a highly dynamic setting - Data-driven but also imaginative and intuitive in coming up with ideas and solutions - Must possess a start-up mindset: hunger to learn quickly and the ability to balance multiple priorities in a fast-paced team environment ### A BIG PLUS if you have - Experience with GoLang or Python - Expertise with video streaming libraries such as FFmpeg or GStreamer - Experience working with video/audio codecs - Experience working with live streaming encoders and WebRTC - Experience working with AI/ML models and applications - Experience in building large-scale applications with Python - Experience writing GraphQL queries and mutations