Kotlin Jobs in Beijing.
All active Kotlin roles based in Beijing.
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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 educating our users, experimenting with big ideas, making fact-based decisions, and finding innovative solutions to complex problems. You’ll have limitless learning opportunities and daily collaborations with world-class minds — while doing work that’s both meaningful and fun.
Join our life-changing mission to develop education for our half a billion (and growing!) learners around the world.
Read our blog to learn more.
About the role...
We’re looking for a Software Engineer I to join our China team. In this role, you’ll build and ship features that drive user growth and deliver high-quality learning experiences to millions of learners in China. You’ll work closely with product managers, designers to create engaging, localized experiences tailored to this market.
This is an opportunity to contribute to a fast-moving, high-impact team focused on one of Duolingo’s most important growth regions. You’ll gain experience working across the stack (backend and client), running experiments, and collaborating cross-functionally to improve key metrics like daily active users (DAU).
🧠 You will...
- Collaborate with product managers and designers to drive user growth in China.
- Work with Government Relations (GR) and cross-functional partners to ensure product compliance in China
- Lead individual project priorities, deadlines, and deliverables
- Contribute to code reviews and collaborate across teams to ensure quality and scalability
✅ You have...
- Graduated or will graduate with a B.S. or M.S. degree in Computer Science or related technical field (i.e. math, physics, or data science) before summer 2026
- 0–1 years of experience programming in one or more of: Java, Python, Kotlin, or Swift
- Dedication to our mission of universally available education
- Relocation to Beijing, China. This position is based in Beijing.
⭐ Exceptional candidates will have...
- A GPA of 3.6+
- A Duolingo streak
- Proficient in both spoken and written English.
Take a peek at how we care for our employees' holistic well-being with our benefits here.
We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact accommodations@duolingo.com.
Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.
By applying for this position your data will be processed as per the Duolingo Applicant Privacy Notice.
Unfortunately, there is a rise in scammers pretending to be real Duolingo employees. Duolingo and our employees will never ask for your Social Security number, bank details, or passport info, and we’ll never ask you to deposit a check, purchase equipment, or exchange money during the interview process. Real Duolingo employees always use an email that ends in @duolingo.com or @recruiting.duolingo.com. Stay alert and double-check these details before sharing any information.
Sign up for job alerts here.
Ready to apply?
Apply to Duolingo
Android Developer (QA Focus), China
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At Branch, we power every touchpoint with links that work and insights that prove it. From click to conversion, we make growth measurable. Our unparalleled attribution, backed by AI-enhanced linking, is trusted to deliver seamless experiences that increase ROI, decrease wasted spend, and eliminate siloed attribution.
We bring the same rigor to how we build our team, by empowering our people to move fast, own outcomes, and build something that matters. We take pride in making meaningful investments in our team’s health, wealth, and growth so individuals can thrive as we scale. Our culture values smart, humble, and collaborative teammates who take accountability and drive results in an environment where their work truly moves the business forward.
We are innovative, scaling with purpose, and led by seasoned leaders who know how to build enduring companies. Trusted by brands like Instacart, Western Union, NBCUniversal, ZocDoc, and Sephora, we’re big enough to matter, small enough for you to make a real impact. If you’re excited by the grit of building, rapid learning, and shaping the future of customer growth, you’ll find your place here.
About the Company
The position is for a silicon-valley based company (Branch Metrics) that specializes in mobile attribution and app discovery. You will be joining an international team developing an in-house SDK used by many OEM phone manufacturers (Xiaomi etc).
About the Role
We are seeking a skilled Android Developer with a strong focus on (QA) to join our mobile engineering team. The ideal candidate has hands-on experience developing Android applications, as well as designing and executing test strategies to ensure high-quality releases. This hybrid role involves both feature development and test automation, ensuring reliability, performance, and a smooth user experience.
Qualifications:
- 3–5 years of Android development experience with a focus on SDKs, libraries, or frameworks.
- Strong proficiency in Kotlin, especially coroutines and Flow.
- Experience with automated testing frameworks (JUnit, Robolectric, Espresso) and mocking libraries(Mockito) .
- Strong debugging skills with tools like ADB, Perfetto, and Android Studio Profiler.
- Experience with Git and CI/CD workflows.
- Extensive experience with Jetpack libraries with Jobscheduler
- Proficiency in reading and written English skills is required as you will need to collaborate with a global team on a daily basis
Nice-to-have:
- SDK development background
- Launcher, AOSP development skills
- Exposure to mobile performance optimization, memory analysis, and ANR mitigation.
- Proficient in speaking English
The salary range provided represents base compensation and does not include potential equity, which is available for qualifying positions. At Branch, we are committed to the well-being of our team by offering a comprehensive benefits package. From health and wellness programs to paid time off and retirement planning options, we provide a range of benefits for qualified employees. For detailed information on the benefits specific to your position, please consult with your recruiter.
Branch is an equal opportunity employer. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran or disability status.
If you think you'd be a good fit for this role, we'd love for you to apply! At Branch, we strive to create an inclusive culture that encourages people from all walks of life to bring their unique, diverse perspectives to work. We aim every day to build an environment that empowers us all to do the best work of our careers, and we can't wait to show you what we have to offer!
A little bit about us:
Branch is the leading provider of engagement and performance mobile SaaS solutions for growth-focused teams, trusted to maximize the value of their evolving digital strategies. The Branch platform provides a seamless experience across paid and organic, on all channels and platforms, online and offline, to eliminate friction and drive valuable action at the moments of highest intent. With Branch, businesses gain accurate mobile measurement and insights into user interactions, enabling them to drive conversions, engagement, and more intelligent marketing spend.
Branch is an award-winning employer headquartered in Mountain View, CA. World-class brands like Instacart, Western Union, NBCUniversal, Zocdoc and Sephora acquire users, retain customers and drive more conversions with Branch.
Candidate Privacy Information:
For more information on the data that Branch will collect through your application, and how we use, share, delete, and retain that information as part of our recruitment and employment efforts, please see our HR Privacy Policy.
Ready to apply?
Apply to Branch Metrics
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.
About the role...
We’re looking for founding members of the newly formed Asia Growth team. Your role will be to improve the Android user experience by leveraging your extensive experience to enhance the performance and efficiency of our Android app. This position offers an exciting opportunity to drive performance improvement initiatives that directly impact user experience and retention. Join us to make a significant impact on Duolingo’s key business metric DAU, worldwide!
🧠 You will...
- Quickly develop native Android application performance optimizations in Kotlin.
- Collaborate closely with cross-functional teams to identify performance bottlenecks and implement solutions.
- Perform experiment analysis on features and find opportunities for optimization.
✅ You have...
- A minimum of 5 years of programming experience in Android development with a strong focus on performance optimization.
- Experience in developing world-class apps with stability, performance, and scalability in mind.
- Demonstrated ability to diagnose and resolve complex performance issues, including memory leaks, UI lag, and slow network responses.
- The ability to communicate technical issues effectively to technical and non-technical stakeholders.
- A desire to make the world a better place through technology and education.
- Ability to apply user insights, data, and statistical analyses to inform decisions.
- A Bachelor’s degree in Computer Science or a related technical field.
- Ability to work from or relocate to Beijing, China.
Take a peek at how we care for our employees' holistic well-being with our benefits here.
We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact accommodations@duolingo.com.
Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.
By applying for this position your data will be processed as per the Duolingo Applicant Privacy Notice.
Unfortunately, there is a rise in scammers pretending to be real Duolingo employees. Duolingo and our employees will never ask for your Social Security number, bank details, or passport info, and we’ll never ask you to deposit a check, purchase equipment, or exchange money during the interview process. Real Duolingo employees always use an email that ends in @duolingo.com or @recruiting.duolingo.com. Stay alert and double-check these details before sharing any information.
Sign up for job alerts here.
Ready to apply?
Apply to Duolingo
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.
About the role
We’re looking for founding members of the newly formed Asia Growth team. Your role will be to improve the Android user experience by leveraging your extensive experience to enhance the performance and efficiency of our Android app. This position offers an exciting opportunity to drive performance improvement initiatives that directly impact user experience and retention. Join us to make a significant impact on Duolingo’s key business metric DAU, worldwide!
You will...
- Quickly develop native Android application performance optimizations in Kotlin.
- Collaborate closely with cross-functional teams to identify performance bottlenecks and implement solutions.
- Perform experiment analysis on features and find opportunities for optimization.
You have...
- A minimum of 5 years of programming experience in Android development with a strong focus on performance optimization.
- Experience in developing world-class apps with stability, performance, and scalability in mind.
- Demonstrated ability to diagnose and resolve complex performance issues, including memory leaks, UI lag, and slow network responses.
- The ability to communicate technical issues effectively to technical and non-technical stakeholders.
- A desire to make the world a better place through technology and education.
- Ability to apply user insights, data, and statistical analyses to inform decisions.
- A Bachelor’s degree in Computer Science or a related technical field.
- Ability to work from or relocate to Beijing, China.
Take a peek at how we care for our employees' holistic well-being with our benefits here.
We will do everything we can within reason to make sure that your interview takes place in an environment that fairly and accurately assesses your skills. If you need assistance or accommodation, please contact accommodations@duolingo.com.
Duolingo is proud to be an Equal Employment Opportunity employer. We do not discriminate based upon race, religion, color, national origin, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, status as a protected veteran, status as an individual with a disability, or other applicable legally protected characteristics.
By applying for this position your data will be processed as per the Duolingo Applicant Privacy Notice.
Unfortunately, there is a rise in scammers pretending to be real Duolingo employees. Duolingo and our employees will never ask for your Social Security number, bank details, or passport info, and we’ll never ask you to deposit a check, purchase equipment, or exchange money during the interview process. Real Duolingo employees always use an email that ends in @duolingo.com or @recruiting.duolingo.com. Stay alert and double-check these details before sharing any information.
Sign up for job alerts here.
Ready to apply?
Apply to Duolingo