Jobs at Critical Mass

Positions 735,996

Critical Mass is a San Francisco‑based data‑science powerhouse that builds real‑time analytics engines for the financial sector. Its flagship product, MassFlow, processes millions of transactions per second using a microservices architecture on Kubernetes. The company has earned recognition for its open‑source contributions to the Apache Arrow community and for securing a Series C round that valued it at over $1 billion.

Critical Mass hires full‑stack engineers, data scientists, DevOps specialists, product managers and security analysts. New hires expect rigorous peer‑review coding, cross‑functional sprint ceremonies, and a culture of continuous learning that includes quarterly hackathons and paid certifications. The company offers a remote‑first policy, a 100‑hour annual training budget, and a transparent equity grant program.

Job Transparency’s listings provide Critical Mass candidates with real‑time salary ranges, interview difficulty ratings and employee sentiment scores. By comparing the disclosed compensation against the market benchmark and reading recent reviews, applicants can negotiate better offers and choose roles that match their career goals.

Freelance Copywriter

Company: Critical Mass

Location: Chicago IL

Posted Sep 01, 2022

The job description is for a freelance Copywriter who loves to collaborate with creatives and strategists. The role involves working on various projects, including video, activations, and experiential, and requires exceptional writing skills, attention to detail, and the ability to work on multiple projects simultaneously.

Creative Engineering Director

Company: Critical Mass

Location: Silicon Valley CA

Posted Sep 03, 2022

The job description is looking for a Creative Engineering Director with excellent problem-solving skills, creative thinking, and experience in a creative or marketing organization. The role involves developing strategic and measurable social and digital programs, recruiting and growing opportunities, and establishing a creative culture within the design team.

Senior Account Manager

Company: Critical Mass

Location: Portland OR

Posted Sep 03, 2022

The job description is for a Senior Account Manager position at Critical Mass, a company that values diversity and inclusion. The role involves managing client relationships, leading project teams, and providing strategic guidance. The company offers a range of benefits and perks, including flexible work arrangements and opportunities for professional development.

Technology Lead

Company: Critical Mass

Location: Other US Location

Posted Sep 01, 2022

The job posting is for a Technology Lead position at Critical Mass, a company that values diversity and inclusion. The role involves leading a team of developers, collaborating with other teams, and working on fast-paced projects. The company offers remote work options and provides equal opportunities for all employees.

Senior Developer

Company: Critical Mass

Location: Chicago IL

Posted Sep 01, 2022

Critical Mass is looking for a senior web developer to join their team. The role involves collaborating with design and UX, mentoring other developers, and ensuring compatibility across devices. The company uses the latest technologies and prioritizes web performance and accessibility.

Developer, PACE, Front End

Company: Critical Mass

Location: Other US Location

Posted Aug 13, 2022

Critical Mass is looking for an AEM developer to join a new team building a dynamic solution for one client who owns multiple brands. The company values collaboration, solution-oriented work environment and fast-paced development. The job requires solid experience in AEM, Java, and related technologies.

Sr. Technology Lead, DevOps

Company: Critical Mass

Location: Other US Location

Posted Aug 15, 2022

The Development Tools Lead role at Critical Mass is a challenging position that requires a strong background in system administration, technical projects, and leadership. The role involves leading and mentoring DevOps Engineers, participating in planning client technical operations solutions, and advocating for compliance needs.

Sr. Social Strategist

Company: Critical Mass

Location: Silicon Valley CA

Posted Sep 01, 2022

Critical Mass is seeking a Sr. Social Strategist to join their growing team. The ideal candidate has social media knowledge and a genuine interest in providing strategic leadership. The role involves developing, implementing, and executing social media strategies for various brand handles.

Associate Creative Project Manager

Company: Critical Mass

Location: South Bay

Posted Aug 15, 2022

The job posting is for an Associate Digital Project Manager at Critical Mass, a company that creates digital experiences for clients. The role involves managing client relations, project delivery, and team communication. The ideal candidate has experience in digital project management, is a creative and strategic thinker, and has a passion for delivering digital experiences.

Senior Copywriter

Company: Critical Mass

Location: Other US Location

Posted Sep 02, 2022

The Critical Mass team creates applications for one of the world's most trafficked websites, helping their client connect with consumers globally through mobile, digital, and in-store experiences. They are looking for a Senior Copywriter with 5-8+ years of experience in an agency or client-side environment, exceptional writing skills, and a keen understanding of Web trends and technologies. The role involves collaborating with UX designers, art directors, and technology developers to bring digital experiences to life, working on multiple projects simultaneously, and maintaining high standards of copywriting.

Account Manager

Company: Critical Mass

Location: Nashville, TN

Posted Sep 03, 2022

The job description is for an Account Manager who will manage client relationships, lead projects, and provide strategic guidance. The role requires experience in account management, customer loyalty initiatives, and digital marketing. The company is an equal opportunity employer committed to diversity and inclusion.

Account Director

Company: Critical Mass

Location: Silicon Valley CA

Posted Aug 14, 2022

The job description highlights the importance of managing client relationships, providing strategic direction, and leading internal teams. The candidate should have experience in digital marketing, advertising, and online media, as well as strong leadership and communication skills.

Frequently Asked Questions

What is it like to work at Critical Mass?
Working at Critical Mass means joining a collaborative, data‑driven environment that values experimentation. You’ll participate in daily stand‑ups, bi‑weekly hackathons, and monthly tech talks. The team embraces remote‑first flexibility, but also meets weekly in the San Francisco office for design sprints. Employees receive a 100‑hour training stipend and can earn equity through a quarterly grant schedule. Open‑source contributions are encouraged and often recognized in performance reviews.
What types of positions does Critical Mass offer?
Critical Mass has openings across engineering, product, and operations. Popular roles include Senior Backend Engineer (Python/Golang), Machine Learning Engineer, Cloud Infrastructure Architect, Product Manager (Analytics), and Security Analyst (Threat Intelligence). The company also hires Data Engineers, Front‑end Engineers, UX Researchers, and DevOps Specialists. Each role offers a hybrid work model and a competitive benefits package.
How can I stand out as an applicant for Critical Mass?
Showcase a portfolio that demonstrates real‑time data processing or distributed system design. Contribute to the company’s open‑source projects on GitHub or publish a blog post about a relevant tech topic. Provide metrics in your resume—e.g., reduced latency by 30% or improved throughput by 50%. Highlight experience with Kubernetes, Apache Arrow, or large‑scale analytics. Prepare for the interview by mastering system design, coding challenges, and aligning your answers with the company’s mission of delivering fast, trustworthy insights to financial clients.

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