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.

Project Manager, Digital Marketing

Company: Critical Mass

Location: Los Angeles, CA

Posted Aug 28, 2024

The job posting is for a Digital Project Manager position at Critical Mass, a company that values diversity and inclusion. The job requires experience in digital marketing, project management, and collaboration. The company offers competitive compensation and benefits packages, as well as opportunities for professional growth and development.

Home Hospital Physician for Hybrid Work Model- Full Time and Part Time Opportunities

Company: Mass General Brigham Community Physicians

Location: Braintree, Massachusetts

Posted Aug 29, 2024

Mass General Brigham, a renowned healthcare system, is expanding its Home Hospital program and seeking innovative physicians. The Home Hospital Physician will provide acute care in patients' homes, collaborating with a multidisciplinary team. The role involves medical decision-making, patient evaluations, documentation, and oversight of the team. Full-time and part-time positions are available. Qualifications include Internal Medicine BC/BE, proficiency in inpatient medicine, virtual care, and multidisciplinary team-based care. The ideal candidate is open-minded, creative, team-oriented, and an expert communicator.

Freelance Senior Art Director

Company: Critical Mass

Location: Chicago, IL

Posted Sep 07, 2024

The job description is for a Freelance Senior Digital Art Director with experience in conceptual development, marketing strategies, and interactive design solutions. The role requires strong digital craft, versatility, and leadership skills. The company, Critical Mass, is an equal opportunity employer committed to diversity and inclusion.

Senior Designer

Company: Critical Mass

Location: South Bay

Posted Sep 06, 2024

The job posting is for a Senior Designer position at Critical Mass, a company that values diversity and inclusion. The role involves designing visual elements, contributing to conceptual work, and leading the production process. The company offers competitive benefits, training, and employee experience.

Palliative Care Physician, Inpatient Palliative Care Consult Service

Company: Mass General Brigham Community Physicians

Location: Newton, Massachusetts

Posted Aug 29, 2024

The Newton-Wellesley Hospital (NWH) Division of Palliative Care is recruiting a BE/BC Hospice and Palliative Medicine physician. The role involves clinical care, teaching, supervision, and administrative work. The ideal candidate will have interest in part-time outpatient work and academic appointment at Tufts Medical School. The Division provides specialized palliative care services in inpatient consultations, ambulatory co-management, and plans to expand ambulatory services.

Project Manager, Digital Marketing

Company: Critical Mass

Location: South Bay

Posted Aug 28, 2024

The job posting is for a Digital Project Manager position at Critical Mass, a company that values diversity and inclusion. The job requires experience in digital marketing, project management, and collaboration. The company offers competitive compensation and benefits packages, as well as opportunities for professional growth and development.

Project Manager, Digital Marketing

Company: Critical Mass

Location: Portland, OR

Posted Aug 28, 2024

The job posting is for a Digital Project Manager position at Critical Mass, a marketing agency. The job requires experience in digital marketing, project management, and collaboration. The company offers competitive compensation and benefits, as well as a diverse and inclusive work environment.

Freelance Copywriter

Company: Critical Mass

Location: Chicago, IL

Posted Sep 06, 2024

The job posting is for a freelance copywriter position at Critical Mass, a company that values diversity and inclusion. The role involves working with designers, art directors, and creative directors to bring concepts to life, and requires exceptional writing skills, attention to detail, and the ability to work on multiple projects simultaneously.

Site Medical Director for Infection Control/ Infectious Disease Specialist

Company: Mass General Brigham Community Physicians

Location: Northampton, Massachusetts

Posted Aug 28, 2024

Cooley Dickinson Hospital, a member of Massachusetts General Brigham, is recruiting a Board-Certified Infectious Disease Specialist for a Site Medical Director role in Infection Control. The position involves providing inpatient and outpatient consultation services, supporting system infection prevention strategies, and maintaining strong relationships with hospital departments. The Infection Control Department is successful, data-driven, and respected within the organization. The role includes co-chairing the Infection Prevention Committee, creating an annual Infection Control Plan, and participating in Antimicrobial Stewardship Committee activities. The ideal candidate will be patient-focused, compassionate, and experienced in treating various medical conditions. The hospital offers modern therapies, a judgment-free environment, and a diverse medical staff. The role requires on-call coverage and participation in the Antimicrobial Stewardship Committee.

Project Manager, Digital Marketing

Company: Critical Mass

Location: Other US Location

Posted Aug 28, 2024

The job posting is for a Digital Project Manager position at Critical Mass, a marketing agency. The job requires experience in digital marketing, project management, and collaboration. The company offers competitive compensation and benefits, as well as a diverse and inclusive work environment.

Freelance Copywriter

Company: Critical Mass

Location: South Bay

Posted Aug 27, 2024

The job description is for a freelance copywriter position at Critical Mass, a company that values diversity and inclusion. The role requires a strong understanding of marketing, digital trends, and technologies, as well as the ability to work on multiple projects simultaneously. The company offers a competitive salary range of $60-$80 USD and a comprehensive benefits package.

Pharmacy Technician - Floor Tech/Order Entry

Company: Critical Care Rx, LLC

Location: Lisle, IL

Posted Sep 06, 2024

Must have IL pharmacy tech license and PTCB certification. Order entry technicians should have the knowledge and skills to accurately input drug orders into the…

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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