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 Coordinator

Company: Critical Mass

Location: Other US Location

Posted Oct 02, 2024

The job description highlights the company's commitment to diversity and inclusion, with a focus on employee well-being and professional development. The role requires strong computer skills, written and verbal communication skills, and the ability to multitask in a fast-paced environment.

Project Manager - Contract

Company: Critical Mass

Location: Other US Location

Posted Oct 03, 2024

The job description is for a Project Manager position at Critical Mass, a company that values diversity and inclusion. The role involves managing digital projects, working with multidisciplinary teams, and communicating with clients. The company offers competitive benefits, flexible work arrangements, and opportunities for growth and development.

Front-End Developer (Contract)

Company: Critical Mass

Location: Other US Location

Posted Oct 04, 2024

The job posting is for a contract Frontend Developer position at Critical Mass, a company that values diversity and inclusion. The job requires experience in HTML5, CSS3, Vanilla JavaScript, and React, as well as proficiency in responsive HTML and CSS. The company offers competitive benefits, flexible work arrangements, and a commitment to fostering diversity and inclusion.

Developer, Front End

Company: Critical Mass

Location: Other US Location

Posted Oct 02, 2024

The job posting is for a developer position at Critical Mass, an experience design agency. The company is looking for an inspired and motivated developer with experience in React, JavaScript, and other technologies. The job requires collaboration with design and UX teams, ensuring code compatibility, and optimizing page performance. The company offers competitive benefits, diversity and inclusion initiatives, and a commitment to fostering a positive work environment.

Home Hospital Physician for Hybrid Work Model with Mass General Brigham

Company: Mass General Brigham Community Physicians

Location: Massachusetts

Posted Oct 02, 2024

Mass General Brigham is expanding its Home Hospital program, offering full-time and part-time opportunities for physicians interested in delivering exceptional patient care in a hybrid work model. The program focuses on patient-centered care, healthcare delivery innovation, health equity, digital health technology, and acute care medicine. Home Hospital Physicians provide hospital-level acute care in patients' homes, collaborating with an interdisciplinary team. Responsibilities include medical decision-making, patient evaluations, documentation, oversight of the team, and being on call for patient needs. The program values interdisciplinary teamwork, patient-centered care, and innovative clinical settings.

Senior Email Developer

Company: Critical Mass

Location: South Bay

Posted Oct 04, 2024

The job posting is for a Senior Email Developer position at Critical Mass, a company that values diversity and inclusion. The job requires experience in HTML, CSS, and email development, as well as the ability to work independently and as part of a team. The company offers competitive compensation and benefits packages, as well as opportunities for professional growth and development.

Developer, Front End

Company: Critical Mass

Location: Los Angeles, CA

Posted Oct 02, 2024

The job posting is for a developer position at Critical Mass, an experience design agency. The job requires experience with React, JavaScript, and other technologies. The company offers competitive compensation and benefits packages, as well as a diverse and inclusive work environment.

Senior Project Manager

Company: Critical Mass

Location: Other US Location

Posted Oct 04, 2024

The job posting is for a Senior Project Manager at Critical Mass, a marketing agency. The ideal candidate has experience in marketing agencies, is adaptable, strategic, and ready to tackle data-driven projects. The company offers competitive benefits, flexible work arrangements, and a commitment to diversity and inclusion.

Developer, Front End

Company: Critical Mass

Location: South Bay

Posted Oct 02, 2024

The job posting is for a developer position at Critical Mass, an experience design agency. The job requires experience with React, JavaScript, and other technologies. The company offers competitive compensation and benefits packages, as well as a diverse and inclusive work environment.

Front-End Developer (Contract)

Company: Critical Mass

Location: Other US Location

Posted Oct 04, 2024

The job posting is for a contract Frontend Developer position at Critical Mass, a company that values diversity and inclusion. The job requires experience in HTML5, CSS3, Vanilla JavaScript, and React, as well as proficiency in responsive HTML and CSS. The company offers competitive benefits, flexible work arrangements, and a commitment to fostering diversity and inclusion.

Primary Care Physician Needed in Watertown, MA

Company: Mass General Brigham Community Physicians

Location: Watertown, Massachusetts

Posted Oct 04, 2024

MGB Integrated Care is a system-led entity offering a wide range of healthcare services, including outpatient surgery, imaging, primary care, behavioral health, and specialty care. They aim to be the first choice for healthcare, providing world-class care closer to home and bridging to renowned hospitals when needed. They seek team members with relevant skills, positive attitudes, flexibility, and creative mindsets. The company offers a productive team-based environment, collaborative care, a new digital platform, no after-hours call for primary care physicians, and streamlined access to the Mass General Brigham Network.

Internal Medicine Physician Needed in Lawrence, MA

Company: Mass General Brigham Community Physicians

Location: Lawrence, Massachusetts

Posted Oct 04, 2024

Mass General Brigham Community Physicians (MGBCP) is recruiting a BC/BE Internist for Pentucket Medical Associates (PMA) in Lawrence, MA. PMA, a large multi-specialty practice, offers a competitive compensation plan, dedicated NP triage, no inpatient responsibilities, fully integrated EHR (Epic), MA support, and tertiary care from Mass General Hospital and Brigham & Women’s Hospital. MGBCP values long-term relationships with patients and clinicians, prioritizing excellent patient care and collaborative decision-making.

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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