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.

Senior Designer

Company: Critical Mass

Location: Portland, OR

Posted Oct 02, 2024

The job posting is for a Senior Designer position at Critical Mass, a marketing agency. The role involves leading the design process for digital marketing campaigns, collaborating with cross-functional teams, and mentoring junior designers. The company offers a competitive salary range of $75,000 to $90,000 and is committed to diversity and inclusion.

Senior Designer

Company: Critical Mass

Location: Other US Location

Posted Oct 02, 2024

The job posting is for a Senior Designer position at Critical Mass, a marketing agency. The role involves leading the design process for digital marketing campaigns, collaborating with cross-functional teams, and mentoring junior designers. The company is committed to diversity and inclusion, and the job requires a strong portfolio and experience in digital design.

Ob/ Gyn Hospitalist Physician (Laborist) for Milford Regional Medical Center

Company: Mass General Brigham Community Physicians

Location: Milford, Massachusetts

Posted Oct 01, 2024

Milford Regional Physician Group is recruiting a board certified or board eligible Ob/Gyn Hospitalist Physician for inpatient care at Milford Regional Medical Center. The Maternity Department, recognized as a Blue Distinction Center Plus, handles around 80 deliveries per month. The role involves six 24-hour shifts per month, with support from Physician Assistants. Benefits include competitive salaries, sign-on bonus, generous paid time off, retirement plans, CME allowance, and a team-based approach to patient care. The hospital system is affiliated with renowned institutions like Dana-Farber Cancer Institute and Mass General Brigham.

SVP, Strategy

Company: Critical Mass

Location: Other US Location

Posted Sep 30, 2024

The job description is looking for a Senior Vice President of Strategy to lead the planning and coordination of client brand ecosystem strategies. The ideal candidate should have expertise in brand strategy, media strategy, performance strategy, CX, social campaigns, and digital technology, with a strong leadership and facilitation experience. The job requires a passion for digital and staying up to date on technology and trends, as well as a commitment to teamwork, collaboration, and learning.

Chair of Emergency Medicine

Company: Mass General Brigham Community Physicians

Location: Salem, Massachusetts

Posted Sep 30, 2024

Mass General Brigham Salem Hospital is seeking a Board-Certified Emergency Medicine physician to serve as the Chair of the Department of Emergency Medicine. The successful candidate will lead the Emergency Department, providing clinical care, promoting excellence, and driving quality, safety, and health equity programs. The role involves collaborating with hospital senior leadership, representing the hospital within the MGB Emergency Medicine Enterprise Service Group, and ensuring innovative, evidence-based medical care. The ideal candidate should have an M.D. or equivalent degree, active Board Certification in Emergency Medicine, and at least ten years of clinical leadership experience. The deadline for application is September 15, 2024.

Gastroenterologist

Company: Mass General Brigham Community Physicians

Location: Haverhill, Massachusetts

Posted Oct 01, 2024

Mass General Brigham Community Physicians (MGBCP) is recruiting a full-time Gastroenterologist for their largest, community-based, multi-specialty practice serving over 65,000 covered lives in the Merrimack Valley. The practice is known for high-quality, patient-focused care. Benefits include a competitive salary, sign-on bonus, generous paid time off, and a fully integrated EPIC medical record. The Gastroenterologist will provide GI services, inpatient consult services, maintain high clinical quality, and collaborate with a multidisciplinary team for coordinated patient care.

Community Primary Care- Mass General Brigham

Company: Mass General Brigham Community Physicians

Location: Massachusetts

Posted Sep 30, 2024

Mass General Brigham, a non-profit health care system, is expanding its community division and offering full-time and part-time Primary Care positions across Massachusetts and Southern New Hampshire. The organization is committed to providing a supportive environment with manageable panel sizes, dedicated Nurse Practitioner call coverage, and a collaborative approach to delivering high-quality, relationship-centered care. Benefits include transparent compensation plans, comprehensive benefits packages, sign-on bonuses, and generous paid time off. The system is an equal opportunity employer.

Site Medical Director for Infection Control/ Infectious Disease Specialist

Company: Mass General Brigham Community Physicians

Location: Northampton, Massachusetts

Posted Sep 30, 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.

Busy Practice outside Boston looking for their next partner!

Company: Central Mass Oral Surgery

Location: Boston, Massachusetts

Posted Sep 30, 2024

Central Mass Oral Surgery, a reputable oral surgery practice near Boston, is seeking an associate to support its growth. The practice, led by board-certified oral surgeons, offers comprehensive oral and maxillofacial surgical care. This is a great opportunity for practicing surgeons or recent residency graduates, with support from senior partners. The practice has offices in Leominster and Gardner, MA, providing ample opportunities for professional growth. US Oral Surgery Management, the nation's leading OMS Management Services Organization, is partnering with the practice. They offer operational and administrative support, allowing surgeons to focus on clinical innovation and patient care. USOSM provides mentorship, marketing guidance, and operational best practices to help surgeons thrive in their careers.

Primary Care Medical Director Opportunity - Newton-Wellesley Medical Group

Company: Mass General Brigham Community Physicians

Location: Waltham, Massachusetts

Posted Oct 02, 2024

Newton-Wellesley Medical Group is seeking a Medical Director for their outpatient primary care practice in Waltham, MA. The role involves providing full scope of primary care services, supervising and evaluating providers, process improvement, quality improvement, compliance efforts, budgeting, and strategic planning. The Medical Director will be part of the Mass General Brigham healthcare system, which is committed to patient care, research, teaching, and service. The employer is an equal opportunity employer.

Neurologist- Staff Physician

Company: Mass General Brigham Community Physicians

Location: Dover, New Hampshire

Posted Sep 30, 2024

Wentworth-Douglass Hospital, a reputable institution in the Mass General Brigham system, is seeking a full-time neurologist to join their expanding neurology clinic. The hospital offers a competitive salary, comprehensive benefits, and the opportunity to practice cutting-edge medicine in a small-town setting. The ideal candidate will have a residency in Neurology, be Board Certified or Board Eligible, and preferably have fellowship training in Parkinson's/Movement disorder, Multiple Sclerosis, or Dementia. The role involves treating general neurology patients, with the flexibility to focus on a preferred specialty and share hospital call coverage with colleagues.

Orthopedic Trauma Surgeon, for Dynamic Seacoast, NH Hospital within the Mass General Brigham HealthCare System

Company: Mass General Brigham Community Physicians

Location: Dover, New Hampshire

Posted Sep 30, 2024

Wentworth-Douglass Hospital, a reputable community hospital in New Hampshire, is recruiting a full-time orthopedic trauma surgeon. The successful candidate will join a high-caliber team in a growing orthopedic and sports medicine practice. The position offers a chance to practice in a beautiful region with a high quality of life, and the hospital is known for its commitment to patient care, innovation, and collegiality.

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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