Software Engineer for Duolingo AI Pets | Hangzhou

KirinHangzhou

On-site Full-time

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Experience Level

Experience

Qualifications

QualificationsAt least 5 years of professional software development experience with a strong emphasis on backend systems. Proficient in Python, TypeScript, and React/Next.js frameworks. Experience with FastAPI, Django, or Flask, as well as modern frontend development tools. Deep understanding of REST design principles, microservice architectures, and PostgreSQL data management. Familiarity with cloud platforms like AWS, GCP, or Azure, along with containerization and automated deployment pipelines. Bonus: Exposure to AI/ML APIs, real-time gaming or simulation systems, and voice/chat integrations. Excellent problem-solving and communication skills; a passion for pets, gaming, or virtual companionship is a plus.

About the job

Join our innovative studio as we develop a captivating range of AI-powered virtual pets, companions that evolve, learn, and engage with users in real-time. We are in the crucial 0→1 phase of our product journey and are seeking a skilled engineer who can seamlessly integrate robust backend systems with enchanting frontend experiences.

Our initial product is Hadi

Design and implement a scalable full-stack architecture utilizing Python/TypeScript for the backend and React/Next.js for the frontend.
Create and maintain real-time pet simulations, managing elements such as feeding, mood, growth, and event loops.
Develop and optimize REST/WebSocket APIs, microservices, and PostgreSQL schemas to ensure smooth operations.
Incorporate AI behavior trees, voice synthesis, and conversational models to imbue pets with unique personalities.
Write clean, maintainable code and conduct comprehensive tests; lead code reviews and provide mentorship to junior developers.
Collaborate closely with product, design, and gameplay teams to refine core pet interactions.
Champion best practices in performance, security, observability, and CI/CD processes using Docker and Kubernetes.
Explore and introduce new technologies (such as FastAPI, tRPC, edge functions) to enhance our capabilities and speed.

Qualifications

At least 5 years of professional software development experience with a strong emphasis on backend systems.
Proficient in Python, TypeScript, and React/Next.js frameworks.
Experience with FastAPI, Django, or Flask, as well as modern frontend development tools.
Deep understanding of REST design principles, microservice architectures, and PostgreSQL data management.
Familiarity with cloud platforms like AWS, GCP, or Azure, along with containerization and automated deployment pipelines.
Bonus: Exposure to AI/ML APIs, real-time gaming or simulation systems, and voice/chat integrations.
Excellent problem-solving and communication skills; a passion for pets, gaming, or virtual companionship is a plus.

About Kirin

Kirin is a pioneering studio dedicated to creating immersive and emotionally engaging AI virtual pets, enabling users to interact, nurture, and develop bonds with their digital companions anytime and anywhere.

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Software Engineer for Duolingo AI Pets | Hangzhou

Kirin

Full-time|On-site|Hangzhou

Join our innovative studio as we develop a captivating range of AI-powered virtual pets—companions that evolve, learn, and engage with users in real-time. We are in the crucial 0→1 phase of our product journey and are seeking a skilled engineer who can seamlessly integrate robust backend systems with enchanting frontend experiences.Our initial product is HadiDesign and implement a scalable full-stack architecture utilizing Python/TypeScript for the backend and React/Next.js for the frontend.Create and maintain real-time pet simulations, managing elements such as feeding, mood, growth, and event loops.Develop and optimize REST/WebSocket APIs, microservices, and PostgreSQL schemas to ensure smooth operations.Incorporate AI behavior trees, voice synthesis, and conversational models to imbue pets with unique personalities.Write clean, maintainable code and conduct comprehensive tests; lead code reviews and provide mentorship to junior developers.Collaborate closely with product, design, and gameplay teams to refine core pet interactions.Champion best practices in performance, security, observability, and CI/CD processes using Docker and Kubernetes.Explore and introduce new technologies (such as FastAPI, tRPC, edge functions) to enhance our capabilities and speed.QualificationsAt least 5 years of professional software development experience with a strong emphasis on backend systems.Proficient in Python, TypeScript, and React/Next.js frameworks.Experience with FastAPI, Django, or Flask, as well as modern frontend development tools.Deep understanding of REST design principles, microservice architectures, and PostgreSQL data management.Familiarity with cloud platforms like AWS, GCP, or Azure, along with containerization and automated deployment pipelines.Bonus: Exposure to AI/ML APIs, real-time gaming or simulation systems, and voice/chat integrations.Excellent problem-solving and communication skills; a passion for pets, gaming, or virtual companionship is a plus.

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Senior Backend Engineer - System Integration

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Our JourneyFounded in 2014, ShopBack emerged from an inspiring late-night idea by Henry and Joel. Our mission extends beyond just creating a Cashback platform; we aim to transform the connection between brands and consumers. Armed with their experience as former advertisers, Henry and Joel recognized the constraints of traditional marketing and identified a unique opportunity to enhance value for both parties. This vision quickly materialized into action, with the first prototype being developed over a weekend with our co-founders. Today, ShopBack proudly serves over 50 million users across 13 markets, collaborates with more than 20,000 merchants, and facilitates over half a million transactions every day. We are on a quest to create The World’s Most Rewarding Way to Shop, and we're inviting passionate, dynamic individuals to join our journey.About the RoleAt ShopBack, our engineering teams are dedicated to building scalable and efficient platforms that cater to eCommerce and travel traffic across the region, ensuring world-class product experiences. You will become part of a diverse and talented group of engineers driven to redefine how users discover, compare, and book travel products.We are expanding our Travel engineering team and are in search of seasoned engineers with experience in developing large-scale travel or OTA (Online Travel Agency) systems. If you have expertise in flight, hotel, or activities search platforms, pricing engines, real-time availability systems, or GDS integrations, we would love to hear from you.We seek individuals who are resilient, self-motivated, and eager to see the tangible impact of their work on a daily basis. Your passion for your craft and continuous pursuit of innovative solutions to complex challenges will be key to your success.

Jan 15, 2026

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Backend Engineer at Meshy | Shanghai

Meshy

Full-time|On-site|Shanghai

About MeshyBased in the heart of Silicon Valley, Meshy stands at the forefront of 3D generative AI technology, committed to Unleashing 3D Creativity by revolutionizing the content creation process. Our platform empowers both seasoned artists and enthusiastic creators to effortlessly design unique 3D assets, transforming text and images into breathtaking 3D models in mere minutes. Tasks that once required weeks and substantial investment now take just 2 minutes and $1.Our exceptional team comprises leading specialists in computer graphics, AI, and art, featuring alumni from prestigious institutions such as MIT, Stanford, and Berkeley, along with veterans from Nvidia and Microsoft. With a diverse and innovative workforce spanning North America, Asia, and Oceania, we are united in overcoming global 3D challenges. Supported by top-tier venture capital firms like Sequoia and GGV, we have successfully raised $52 Million in funding.As the industry leader, Meshy is recognized as the No.1 choice among 3D AI tools (according to 2024 A16Z Games) and ranks No.1 in web traffic (according to SimilarWeb, with 3 Million monthly visits). Our platform boasts over 5 Million users and has produced 40 Million models.Our founder and CEO, Yuanming (Ethan) Hu, holds a Ph.D. in graphics and AI from MIT, where he pioneered the acclaimed Taichi GPU programming language (27K stars on GitHub, utilized by over 300 institutions). His influential work has garnered numerous accolades, including an honorable mention for the SIGGRAPH 2022 Outstanding Doctoral Dissertation Award and over 2,700 research citations.What You’ll Do:Collaborate with cross-functional teams to deliver high-quality features on time.Execute detailed design, coding, and unit testing based on specifications and design documents.Engage in code reviews, share best practices, and enhance the team's technical expertise.Create and maintain distributed, robust, and scalable applications deployed in Kubernetes environments serving hundreds of millions of users.Provide support and debug production issues through on-call rotations.What We're Looking For:A minimum of 3 years' experience in backend development.Proficient with SQL databases (MySQL, PostgreSQL, etc.).Strong expertise in one or more backend programming languages, including Golang, TypeScript, and Python.

Jan 9, 2026

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Senior Backend Engineer - Travel Product

ShopBack

Full-time|On-site|Shenzhen, China

Join Our MissionAt ShopBack, we are redefining the eCommerce landscape since our inception in 2014. Our founders, Henry and Joel, envisioned not merely a Cashback platform but a transformative approach to how brands and consumers engage with one another. Recognizing the shortcomings of traditional marketing, they seized the opportunity to offer more substantial value to both consumers and brands. This vision quickly became reality, leading to the creation of our first prototype over a weekend with our co-founders. Today, ShopBack boasts over 50 million users across 13 markets, partners with more than 20,000 merchants, and facilitates over half a million transactions every day. We are on a mission to create the world’s most rewarding shopping experience, and we are looking for innovative and driven individuals to join our journey.Position OverviewWe are expanding our Travel engineering team and are in search of seasoned engineers with experience in developing large-scale travel or Online Travel Agency (OTA) systems. If you have a background in building flight, hotel, or activities search platforms, pricing engines, real-time availability systems, or GDS integrations, we want to hear from you. You will collaborate with a talented team of engineers who are passionate about revolutionizing the way users discover, compare, and book travel products.We are looking for resilient, self-driven, and highly motivated individuals who are eager to see the impact of their work daily. If you have a passion for problem-solving and continuously seek better ways to tackle challenges, you will find a fulfilling career with us.

Dec 10, 2025

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Backend Engineer (Golang&PHP)

Xsolla

Full-time|On-site|Beijing, China

ABOUT USXsolla is a leading global commerce platform dedicated to empowering game developers with innovative tools and services that address the unique challenges within the gaming industry. From indie studios to major AAA titles, we partner with developers to facilitate funding, distribution, marketing, and monetization of their games. With a strong belief in the evolution of gaming, Xsolla is committed to connecting opportunities and continually providing invaluable resources for creators. Headquartered in Los Angeles, California, we operate as the merchant of record and have successfully assisted over 1,500 game developers in expanding their reach and enhancing their business growth worldwide. Our mission is to provide developers with diverse avenues for profitability and success.For further details, please visit xsolla.com.ABOUT YOUWe are seeking a highly skilled Senior Backend Engineer to join our Technical Integration Team in China. This team is dedicated to fostering innovation and delivering customized solutions for our key partners in the region through bespoke integration projects, localized enhancements, and specialized technical support tailored to meet the distinct demands of the local market.If you are driven, not afraid of tackling complex challenges, eager to develop your skills, and have a passion for the video game industry, this position may be the ideal fit for you.

Mar 10, 2025

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