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Our mission at Duolingo is to develop the best education in the world and make it universally available. It’s a big mission, and that’s where you come in! At Duolingo, you’ll join a team that cares about finding innovative solutions to complex technical problems , running countless experiments (300+ at a time!) with our massive user base to make data-driven decisions, and educating our users and employees alike. You’ll have limitless learning opportunities, mentorship and collaboration with world-class minds, and a variety of projects with large scopes — while doing work that’s both fun and meaningful. Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world. We’re looking for backend engineers who have experience building and operating reliable, scalable systems. Your background may be in product engineering, infrastructure, platform engineering, or a combination of these. What matters most is strong backend fundamentals, sound systems thinking, and the ability to take ownership of complex technical problems from design through production. Below you can find more information about the team we're hiring for: Ads: Duolingo's Monetization pillar builds the systems that fund our mission — from subscription packaging and advertising to ML-powered personalization. As a Backend Engineer on the Ads team, you'll work on a product engineering team responsible for growing and scaling Duolingo's ads business: high-quality ads that delight learners, fit seamlessly into the product experience, and meaningfully contribute to our bottom line. The team owns ad serving, mediation and demand, in-product ad formats and surfaces, and more. You'll work cross-functionally with product, design, data science, machine learning, and ad operations. 🧠 You will... • Collaborate on software projects with product design and backend aspects • Develop, release, and maintain backend services and/or infrastructure • Lead individual project priorities, milestones, and ensure we're always shipping ✅ You have... • A Bachelor’s degree in Computer Science or a related technical field • Strong competencies in data structures, algorithms, and software design • Experience programming in Java, Python, or Kotlin • Solid understanding of one or more database technologies ⭐ Exceptional candidates will have... • Industry experience building high-traffic APIs using public cloud providers • Experience with industry observability technology, such as OpenTelemetry, Grafana, Prometheus, or DataDog. The offered salary is dependent upon several factors, including work experience, skills, and internal peer comparisons. The posted range is subject to change in the future. For this role, base salary is supplemented by equity compensation. We encourage you to talk with your recruiter for more information related to compensation for this role! Salary Range: $182,800 — $247,300 USD Benefits: Take a peek at how we care for our employees' holistic well-being with our benefits here . Job Alerts: Sign up for job alerts <a href="http://my.greenhouse.io/users/sign_in?job_board=

Senior Software Engineer, Backend

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