Critical Mass is a team of 1,800 inspired folks based in 12 offices around the world, providing full-service digital capabilities for the greatest brands on Earth. Our secret sauce is our uncompromising design standards, our relentless focus on customers, and an ability to put powerful new technologies to work for our clients. We work with the best—Apple, Nike, Mars Wrigley, Nissan, Diageo, Airbnb, BMW, BNY Mellon, Johnson &amp; Johnson, and many more—brands who strive for connected digital ecosystems and unparalleled experiences. We help them get there by gaining deep insight into their consumers and orchestrating data, AI, design, media, and tech stacks around human stories. We’re a global agency founded in Canada, but digital is our home. If you know us, then you know we’re a special, quirky place that attracts big talent and tiny egos. (We actually give out a “so f-n nice” award—lots of them). But just because we’re friendly doesn’t mean we’re not a force to be reckoned with. We’re driven. Relentless. And we live our values. We’re Critical Mass, but our friends call us CM. Please call us CM!

Critical mass

Quality Assurance Specialist

Senior Project Manager

Senior Media Planner, Retail

Senior Copywriter

Group Creative Director

Creative Director, Design

Senior Data Engineer

Ello

Product Engineer (Mobile)

ElevenLabs

Performance Marketing Lead

Ello seeks a Product Engineer (Mobile) to bridge design and engineering, focusing on seamless mobile front-end experiences.  Responsibilities include developing and integrating front-end components using React & Flutter, owning features end-to-end, acting as a liaison between design and engineering, building new components, and managing production workflows.  The ideal candidate possesses strong UI/UX design skills, mobile development experience (Flutter or native Android), and a computer science/engineering background.  They'll bring Ello's AI tutoring to life through character development and game interactions, ensuring engaging and educational experiences for children.

The world’s first AI reading coach that works with real books.

Tech Lead, Machine Learning

Senior Mobile Engineer (Flutter)

Senior Designer, New Products

Mobile Engineer (Flutter)

Design Engineer (Mobile)

<div class="_descriptionText_4fqrp_201">Engineering, full-timeSan Francisco (Relocation assistance available)Salary range: $140,000 - $210,000 + EquityAt Ello, our mission is to maximize the potential of all children. Our first product, Read with Ello, is an AI reading teacher that listens to children read out loud. Ello uses speech recognition to help them when they get stuck, makes up stories using generative AI, and inspires a love for reading.We’re now building on the success of Read with Ello and putting together the pieces of the world’s first complete AI teacher for all children. Together, we believe we can close the primary school education gap worldwide.Ello has been recognized on Fortune’s “Change the World” and Time’s 2024 Best Inventions lists. We are well-funded, backed by world-class investors, and ready to recruit new talent to help us achieve our vision.Who you’ll be joiningEllo is a rapidly growing, series A startup focused on revolutionizing the way children learn and interact with technology. You will work directly with Ello’s Co-founder &amp; CTO, Catalin Voss, on a small team (&lt;10) of engineers, learning designers, and PMs to develop new products. We work in-person out of our San Francisco office and we’re big believers in face-to-face collaboration.About the roleWe’re looking for a Product Engineer to bridge the gap between design and engineering, focusing on creating seamless front-end experiences on mobile platforms. You will own feature development from start to finish, at times acting as your own product manager, and collaborating closely with product and engineering teams. You don’t need to be an illustrator, but you’re able to take an existing component library and build new frontend tools from scratch on the frontend (React &amp; Flutter) without a designer. You’re responsible for bringing Ello’s tutoring AI to life through character development and game interactions. You pay attention to the details. You want to build products that delight users.We welcome candidates from both design and engineering backgrounds, but we prioritize strong technical foundations and demonstrated execution speed.Responsibilities<ul style="min-height:1.5em"><li>Develop and integrate front-end components for mobile and web platforms, leveraging existing design systems and brand guidelines.</li><li>Own features end-to-end, from concept to delivery</li><li>Serve as a bridge between design and engineering, moving fluidly between UX/UI and technical problem-solving.</li><li>Build new components and maintain consistency within the app.</li><li>Set up basic infrastructure, manage production workflows, and handle continuous integration and app store delivery/release processes.</li></ul> Required Experience<ul style="min-height:1.5em"><li>Design:<ul style="min-height:1.5em"><li>Proven UI/UX design skills, with experience across both mobile and web interfaces</li><li>Very high level of attention to detail. For example, you see how small changes in a character’s facial expression or the shading of a background affect the emotional impact of the end product</li><li>Demonstrated ability to work within existing design systems and brand standards to build new front-end components</li><li>Cross-functional skills, having either picked up engineering from a design domain or design skills from a computer science background</li></ul></li><li>Engineering:<ul style="min-height:1.5em"><li>Experience with object-oriented programming and production-grade mobile development</li><li>Computer science/engineering background or equivalent extensive front-end engineering experience</li><li>Knowledge of front-end development platforms (web and mobile)</li><li>Understanding of mobile app architecture, design patterns, and performance optimization techniques</li><li>Experience with Flutter or native Android development in Java/Kotlin</li><li>Familiarity with Git flow, basic infrastructure setup, and production workflows</li><li>Exposure to continuous integration, app store delivery, and release processes</li><li>Exposure to agile development methodologies and project management tools, version control systems, and collaborative development tools</li></ul></li></ul> Nice to have experience<ul style="min-height:1.5em"><li>Experience as a product manager or in a role with significant ownership over features or components.</li><li>Experience with game development</li><li>Experience with generative AI applications</li><li>Experience with designing products for children</li></ul>We look for candidates who<ul style="min-height:1.5em"><li>Have something to teach us</li><li>Want to do work they are proud of to ship products they are proud of</li><li>Have an urge to make a real impact on child development at scale</li><li>Take initiative and full ownership of their work</li><li>Prefer open and direct communication grounded in empathy to beating around the bush</li><li>Exemplify integrity in their actions, decisions, and communication</li><li>Want to build meaningful relationships at work</li></ul>Here are some reasons to be a part of our team<ul style="min-height:1.5em"><li>Immerse yourself in a collaborative environment surrounded by an A+ team</li><li>Dive deep into the rapidly evolving world AI and interactive learning.</li><li>Experience the joy of turning your designs and code into engaging and educational experiences for children worldwide.</li><li>Work in tandem with our engineering teams to harness the full power of technology to reimagine education.</li></ul>About ElloEllo is a public benefit corporation on a mission to maximize the potential of all children. We’re currently around 45 people, headquartered in San Francisco, with offices in São Paulo, Brazil; Nairobi, Kenya; and New York.Our team has deep expertise in artificial intelligence, K-12 education, and child development across institutions such as Stanford, Berkeley, Google, Apple, and more. We were part of Y Combinator’s W20 batch and are funded by world-class investors including Goodwater Capital, Homebrew, Reed Hastings, Common Sense Growth, Ravensburger, Project A Ventures, Reach Capital, Khosla Ventures, WndrCo, Visible Ventures, and K9 Ventures.We’re a small, collaborative team that takes each other’s voices very seriously. Because our mission is to support all children, it is critical that our team is representative of the communities we work in; we place significant emphasis on ensuring diversity in our team and inclusion in our culture.We feel enormously privileged to be one of the few companies that has the opportunity to take a shot at truly revolutionizing education with AI at this inflection point in technology. We don’t take it for granted, so we work quite hard to turn that vision into reality with urgency. We want to create an environment in which we can all be our best selves, use our strengths to take Ello forward, and develop our own skills. We want to have fun while working hard to do impactful things that we’re proud of – and we believe it’s possible to do both.At Ello, we view diversity as a moral imperative and a competitive advantage. We do not discriminate on the basis of race, religion, skin color, national origin, gender, sexual orientation, age, marital status, veteran status, or disability status. We plan and structure our interviews to directly assess skills and experience. If you need any accommodations throughout the interview process, please reach out to jackie@ello.com.Compensation Range: $140K - $210K</div>

As a Quality Assurance Specialist at Critical Mass, you will be responsible for ensuring the quality of our projects by working closely with the QA Lead, Subject Matter Experts, and other team members. Your role will involve creating and executing test plans, writing test cases, identifying and tracking defects, and collaborating with developers to resolve issues. You will also be responsible for communicating test results, issues, and risks to the project team and management.

<div>An Intermediate QA reports to a QA Lead. Works closely with QA lead, QA Subject Matter Experts, other QA members, Project managers, designers and developers to ensure QA standards and client satisfaction are delivered. He/She Provides execution of QA tasks with speed and great quality for the overall agility of the QA team.
<hr>
You will:
<ul>
<li>Be co-responsible for the quality of projects based on the requirements and design specifications.</li>
<li>Responsible for attending meetings providing status, taking notes and providing feedback when needed.</li>
<li>Be able to communicate test results, issues, and risks found to project team members, project managers, and QA management through the different channels.</li>
<li>Identify test data</li>
<li>Create and maintain comprehensive test plans</li>
<li>Write and maintain test cases/scripts</li>
<li>Create traceability matrix documents based upon project requirements</li>
<li>Create checklist documentation based upon project requirements</li>
<li>Perform functional and non functional testing</li>
<li>Effectively communicating statuses</li>
<li>Apply industry standard testing methodology, strategies and industry best practices</li>
<li>Create defect tickets and track issues to resolution</li>
<li>Report creation and related metrics at different levels when necessary</li>
<li>Support the team on onboarding co-workers and/or junior staff members</li>
<li>Should be able to execute regression tests based on design specifications and requirements</li>
<li>Expected to support QA estimations if needed.</li>
<li>Expected to fully understand project life cycle and industry standards.</li>
<li>Expected to fully understand testing methodologies</li>
<li>Expected to ask all necessary questions when tasks, requirements or information isn’t clear or missing</li>
<li>Identify and raise risks</li>
<li>Should be able to work with other team members to ensure the success of projects.</li>
<li>Should be able to analyze and understand details and requirements of projects and tickets.&nbsp;</li>
</ul>
You have:
<ul>
<li>English Proficiency (B2+/C1 reading, writing, and conversation).</li>
<li>Minimum 2 years of experience in software quality assurance.</li>
<li>Bachelor’s degree in software engineering or related field or equivalent work experience.</li>
<li>Knowledge of Agile Methodologies for software development</li>
<li>Experience managing test case management tools: Xray, TestRail, Browser Stack Test Management.&nbsp;</li>
<li>Experience working with local and offshore teams</li>
<li>Experience in task management and defect tracking tools like Jira and/or similar</li>
<li>Bug reporting: Jira</li>
<li>CMS experience: AEM or similars is a plus.</li>
</ul>
What We Offer:&nbsp;
<ul class="ul1">
<li class="li1">Maternity and parental leave extra days</li>
<li class="li1">Competitive benefits packages</li>
<li class="li1">Vacation, compassionate leave, sick days, and flex days</li>
<li class="li1">Access to online services for families and new parents</li>
<li class="li1">End-of-year closure days (not deducted from vacation balance)</li>
<li class="li1">Diversity and Inclusion Board with 12 affinity groups</li>
<li class="li1">Internal learning and development programs</li>
<li class="li1">Enterprise-wide employee discounts</li>
<li class="li1">And more…</li>
</ul>
At Critical Mass, we value our employees and offer competitive compensation and benefits packages. If you’re looking for a challenging and rewarding opportunity to make a significant impact on the lives of our employees, we encourage you to apply for this exciting position today!
The Talent Team at Critical Mass is focused on ensuring we provide the best training, onboarding, and employee experience possible! Our new hires &amp; employees are the future of our organization, and we want to set you up for long-term success. In an effort to do so, we expect our team to work from an office a minimum of 3 days a week.</div>