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.

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.

Available Work Location: Shanghai, China 

What you’ll do

You are the technical keystone through the entire sales cycle - pre and post sales. You will work closely with our Enterprise prospects and customers in Greater China region to educate, empower, and ensure their success on the Cloudflare platform. You will leverage your technical expertise in Cloudflare’s global distributed network and technology to find best-fit solutions for prospects, to train and onboard new customers via video-conference, in person, or through documentation, and to support the long-term success of the customer. As an expert on web/mobile security and performance, you are a trusted source for developing new firewall rules from log files, crafting performance caching and delivery strategies, and creating or repurposing internal tools and scripts for customers.

As a Solutions Engineer, you are the technical customer advocate within Cloudflare. To aid your customers, you will work closely with every team at Cloudflare, from Sales and Product to Engineering and Customer Support. Your goal of customer success should drive you through the entire organization as you seek out and create scalable solutions for your customer’s needs.

What we're looking for 

Our Solutions Engineers come from a wide range of backgrounds: financial consulting, engineering, software development, product management, customer support & project delivery. We're serious about building a diverse team. When hiring we look for diversity of experience combined with genuine curiosity for our technology.

Ultimately, you are passionate about technology and have the ability to explain complex technical concepts in easy-to-understand terms. You are naturally curious, and an avid builder who is not afraid to get your hands dirty. You appreciate the diversity of challenges in working with customers, and look forward to helping them realize the full promise of Cloudflare. On the Solutions Engineering team, you will find a collaborative environment where everyone brings different strengths and jumps in to help each other.

Additional experience might include a combination of the skills below:

• Ability to manage a project, work to deadlines, and prioritize between competing demands;
• Hands on technically.
• Understanding of “how the internet works”. For example:
• Know the differences between TCP & UDP, and understand what kinds of applications may favor one over the other;
• Can explain the difference between authoritative DNS & recursive DNS;
• You understand the role of a firewall, why TLS (SSL) plays an increasingly important role on today's Internet, a solid understanding of HTTP and a willingness to dive deeper into the quirks of clients & servers alike;

Bonus Points

• Previous experience in a sales or consulting role covering East China region. 
• Fluency in Mandarin and English to support regional customers;
• Demonstrated experience with a scripting language (e.g. Python, JavaScript, Bash) and a desire to expand those skills;
• You've built a web application before, or contributed to an existing application in a meaningful way;
• You can describe the differences between CSRF, XSS and SQLi in detail, and Cloudflare's role in defending against them;
• Understanding of, or experience with, regulatory requirements such a PCI DSS, HIPAA, and SOC-2;

Software has moved to play a central role in network technology. From outstanding routing implementations like Bird and FRR to overlay networking technology such as OVN/OVS and Cilium, from kernel with SwitchDev to userspace with DPDK, from P4 to OpenFlow, the relationship between network innovation and software continues to deepen. We are building teams to bring the very best open source networking software to market in a well integrated and opinionated stack that brings the latest hyperscaler innovation to end users and enterprise customers.

We work with networking silicon providers to optimize Ubuntu and related applications for their ASICs, boards and appliances. We aim to provide a complete open source stack for data center networking, from bare metal through virtualization, container and serverless, and also to address IoT networking systematically.

You will have a good chance of success if you are an outstanding software engineer, passionate about networking, with a special interest in the interface of hardware ASICs for acceleration and software for innovation and control. We value experience in open switch initiatives such as SoNIC and DENT, and upstream experience with components such as routing, kernel networking, eBPF, DNS, firewalls and load balancers. Our selection process is rigorous and requires work from the candidate as six to eight interviews over a period of months. We look for excellent academic results and a commitment to quality, resilience, documentation, security and performance in your work.

At Canonical you will have the opportunity to engage with the broader open-source community and industry leading partners in developing future-proof networking solutions. We're looking for individuals who can help build a thriving community, contribute to a broad range of technologies, and contribute to the deployment of Ubuntu, Ubuntu Core, Private Clouds, MAAS and Kubernetes across a broad range of devices and use cases.

Location: we have network software engineering roles in APAC (Top-of-Rack switches) and Americas (SmartNIC/DPU) time zones.

What your day will look like

• Work with the most advanced operating systems and network application technologies available
• Participate upstream and deliver the Ubuntu SoNIC stack
• Collaborate with public clouds and network silicon providers
• Design and implement the best software-defined networking experience for the data center
• Write high-quality, well-designed, fast, secure and well-documented software
• Debug issues and produce high-quality fixes
• Collaborate proactively with a globally distributed organization
• Contribute to technical documentation to make it the best of its kind
• Display technical leadership internally, towards our partners, and in the open source communities
• Influence open-source projects and communities
• Work from home, with global travel twice a year for company events of up to two weeks duration

What we are looking for in you

• An exceptional academic track record
• Undergraduate degree in Computer Science or STEM, or a compelling narrative about your alternative path
• Drive and a track record of going above-and-beyond expectations
• Knowledge of networking: architecture, design, and protocols
• Understanding of Linux networking, from kernel to user space
• Fluency in C/C++ and at least one of Rust, Python or Golang
• Professional written and spoken English 
• Experience with Linux
• Excellent interpersonal skills, curiosity, flexibility, and accountability 
• Passion, thoughtfulness, and self-motivation 
• Excellent communication and presentation skills 
• Result-oriented, with a personal drive to meet commitments 
• Ability to travel twice a year, for company events up to two weeks each

Additional skills that you might also bring

• Familiarity with existing open source networking technologies: SONIC / SAI, kernel (e.g. eBPF, AF_XDP), DPDK, Switchdev, OVN, Open vSwitch.
• Familiarity with data path hardware acceleration protocols and interfaces, such as RDMA, RoCE, iWARP, NVMe, SR-IOV
• Computer architecture knowledge of x86, ARM, and RISC-V
• Experience in complex IP network engineering and implementation
• Experience with virtualization technologies, e.g., QEMU, KVM, etc.
• Previous contribution to open source projects and community involvement
• Performance engineering and security experience

What we offer you

We consider geographical location, experience, and performance in shaping compensation worldwide. We revisit compensation annually (and more often for graduates and associates) to ensure we recognise outstanding performance. In addition to base pay, we offer a performance-driven annual bonus. We provide all team members with additional benefits, which reflect our values and ideals. We balance our programs to meet local needs and ensure fairness globally.

• Distributed work environment with twice-yearly team sprints in person
• Personal learning and development budget of USD 2,000 per year
• Annual compensation review
• Recognition rewards
• Annual holiday leave
• Maternity and paternity leave
• Employee Assistance Programme
• Opportunity to travel to new locations to meet colleagues
• Priority Pass, and travel upgrades for long haul company events

About Canonical

Canonical is a pioneering tech firm at the forefront of the global move to open source. As the company that publishes Ubuntu, one of the most important open source projects and the platform for AI, IoT and the cloud, we are changing the world every day. We recruit on a global basis and set a very high standard for people joining the company. We expect excellence - in order to succeed, we need to be the best at what we do. Canonical has been a remote-first company since its inception in 2004.​ Working here is a step into the future, and will challenge you to think differently, work smarter, learn new skills, and raise your game.

Canonical is an equal opportunity employer

We are proud to foster a workplace free from discrimination. Diversity of experience, perspectives, and background create a better work environment and better products. Whatever your identity, we will give your application fair consideration.

#LI-remote

Key Responsibilities:

• Responsible for the infrastructure construction of the company’s internal security operation platform SOC and subsequent security incident management, incident discovery, analysis, emergency response, etc.
• Responsible for general 0day vulnerability analysis, penetration analysis and intrusion detection, timely discovering security risks and taking effective protective measures.
• Responsible for penetration testing, confrontation drills, and assessment of various security products and defense capabilities in intranet, public network, and cloud environments.
• Responsible for risk asset management, automated response orchestration SOAR, tracking and traceability functions, vulnerability emergency response, etc.
• Responsible for the operation of SRC and follow-up of related vulnerability repairs.

Key Requirements

• Bachelor’s degree in Computer Science, Information Security, or a related field.
• More than 1 year of experience in incident response, system security, network monitoring, vulnerability management, or related fields.
• Familiarity with best practices in security engineering, including network security, security operations, system security, and incident response.
• Proficiency in specialized technical areas such as intrusion detection, deception detection, digital forensics, malware analysis, and threat tracking.
• Ability to identify and remediate security vulnerabilities, and knowledge of common techniques used by attackers and security defense measures.
• Familiarity with commonly used security monitoring, log analysis, and forensic tools, and the ability to effectively apply them in the investigation and analysis of security events.
• Proficiency in at least one scripting language, such as Python, Perl, or Bash, with experience in automating security tasks and tool development.
• Good communication and coordination skills, strong sense of ownership.