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.

Colorado Physician - Nocturnist Critical Care Medicine

Company: Critical Care, Pulmonary and Sleep Assocs

Location: Denver, Colorado

Posted Nov 21, 2024

Critical Care, Pulmonary and Sleep Associates (CCPSA) is a well-established, physician-owned multispecialty private practice in Denver, serving multiple CommonSpirit and AdventHealth hospitals for over 40 years. They provide comprehensive critical care, pulmonary, and sleep care services, including direct patient care, ICU procedures, and a robust Interventional Pulmonary Service. CCPSA's team of over 30 Board Certified physicians serves diverse patient populations, including complex cases like ECMO, transplant, and neurosurgical patients. They are currently seeking a board-eligible or board-certified Critical Care Nocturnist to join their dedicated team, offering competitive compensation and benefits.

Data Centre Site Engineer

Company: Salute Mission Critical

Location: Other US Location

Posted Nov 21, 2024

Salute Mission Critical is looking to recruit a Data Center Engineer in Brussels to ensure the operation and maintenance of data center services. The role involves monitoring, maintaining, and responding to issues with electrical, mechanical, and firelife safety equipment.

Family Medicine Physicians Needed in Waltham, MA - Community Division of Mass General Brigham

Company: Mass General Brigham Community Physicians

Location: Waltham, Massachusetts

Posted Nov 20, 2024

Waltham Family Medicine, part of Mass General Brigham, is recruiting board certified or eligible Family Medicine or Med/Peds physicians for part-time or full-time positions in Waltham, MA. The practice offers competitive compensation, manageable panel sizes, an integrated EPIC platform, NP call service, a positive team environment, and collaboration for high-quality care. The position also provides streamlined access to the extensive MGB network, including Brigham and Women’s Hospital and Mass General Hospital.

Gastroenterologist- Multiple Locations

Company: Mass General Brigham Community Physicians

Location: Greater Boston Area

Posted Nov 10, 2024

Mass General Brigham's community division is expanding Gastroenterology services in Massachusetts and Southern New Hampshire. They are seeking Board Certified or Board Eligible Gastroenterologists for locations in Braintree, MA, Salem, MA, and Salem, NH. The role involves providing GI services, maintaining high clinical quality, partnering with a multidisciplinary team, and developing referral and educational relationships. Benefits include a competitive salary, sign-on bonus, generous paid time off, and a fully integrated EPIC medical record.

Internal Medicine Physician- Milford Regional Physician Group

Company: Mass General Brigham Community Physicians

Location: Milford, Massachusetts

Posted Nov 19, 2024

Milford Regional Physician Group is seeking an Internal Medicine Physician to join their team. They offer a warm, caring work environment with excellent work-life balance. The group is the largest multi-specialty physician group in the region, with over 200 physicians and advanced practitioners. They provide professional support, a patient-centered approach to care, and opportunities for physicians to influence decisions. Benefits include competitive salaries, comprehensive benefits package, sign-on bonus, generous paid time off, and CME allowance. The group is affiliated with Brigham & Women’s Hospital, UMASS Medical Center, and the Dana Farber Cancer Institute.

Traveling Licensed AC Journeyman Electrician ($125/Day Per Diem Daily!!)

Company: Critical Energy Services Inc.

Location: Florida

Posted Nov 14, 2024

Must have own tools for the trade. Company Vehicle after 90-days with a clean driving record (Leads Only). Electrical troubleshooting: 1 year (Required).

Internal Medicine Physician Needed in Haverhill, MA

Company: Mass General Brigham Community Physicians

Location: Haverhill, Massachusetts

Posted Nov 19, 2024

Mass General Brigham Community Physicians (MGBCP) is recruiting a BC/BE Internist for Pentucket Medical Associates (PMA) in Haverhill, MA. PMA, a large multi-specialty practice, offers a competitive compensation plan, dedicated NP triage, no inpatient responsibilities, and full EHR integration. MGBCP values long-term patient relationships, collaborative decision-making, and excellent patient care. The organization is an equal opportunity employer.

IT Systems Administrator

Company: Salute Mission Critical

Location: Atlanta, GA

Posted Nov 21, 2024

The job posting is for an IT Systems Administrator position at Salute, a leading provider of data center infrastructure services. The role involves deploying and managing IT systems, providing technical support, and working with cloud-based and on-prem architecture. The company is seeking a dynamic and experienced candidate with a strong background in IT and excellent customer service skills.

Primary Care Physician- Westwood, MA

Company: Mass General Brigham Community Physicians

Location: Westwood, Massachusetts

Posted Nov 21, 2024

Mass General Brigham is recruiting a Board Certified or Board Eligible Internal Medicine or Family Medicine physician for their Adult Primary Care team at Brigham & Women’s Health Care Center- Westwood. The position offers full and part-time opportunities, and is suitable for all experience levels. The state-of-the-art facility, located in University Station, provides a collaborative and efficient work environment. Benefits include competitive compensation, comprehensive benefits, no inpatient responsibilities, and support from a dedicated team of Nurse Practitioners.

Family Medicine Opportunities within Cooley Dickinson Medical Group (Northampton and Hadley)

Company: Mass General Brigham Community Physicians

Location: Northampton, Massachusetts

Posted Nov 20, 2024

Cooley Dickinson Medical Group is seeking a BE/BC Family Medicine Physician to join their thriving practice in Northampton, MA. The Northampton Family Medicine is an award-winning family practice with five board-certified physicians and three advanced practice providers. The practice is located at Cooley Dickinson’s Atwood Health Center, offering a wide range of services including OBGYN, Diabetes Center, Infectious Diseases, General Surgical Care, and more. Cooley Dickinson values provider balance and quality of life, with after-hours call staffed by a Mass General Brigham provider care team. Northampton, MA, a dynamic arts and five-college community, offers quintessential New England charm, big-city resources, and outdoor activities. The Cooley Dickinson Hospital system, an affiliate of Mass General Brigham, is a progressive, empowering employer with a medical staff of approximately 500 active members.

Per Diem Urgent Care Physician Opportunity - North of Boston

Company: Mass General Brigham Community Physicians

Location: Danvers, Massachusetts

Posted Nov 19, 2024

North Shore Physicians Group (NSPG) is recruiting board-certified/board-eligible Emergency Medicine physicians for per diem opportunities at their Urgent Care Center in Danvers, MA. The role offers a flexible schedule, collaborative environment, and the chance to work with a wide range of patients. Benefits include experienced support staff, access to advanced imaging and lab services, and a network of specialty physicians.

Primary Care Opportunities within Newton-Wellesley Medical Group (IM, FM, Med-Peds)

Company: Mass General Brigham Community Physicians

Location: Newton, Massachusetts

Posted Nov 22, 2024

Newton-Wellesley Medical Group (NWMG), part of Mass General Brigham Community Physicians, is recruiting Primary Care Physicians for outpatient practices in Newton, Walpole, and Millis, MA. Candidates must be board certified or eligible in FM, IM, or Med-Peds. The role involves providing comprehensive primary care services, including diagnosis, treatment, coordination of care, preventive care, and health maintenance. NWMG offers competitive compensation, manageable panel sizes, an integrated EPIC platform, a positive team-based environment, and access to the extensive MGB network, including Brigham and Women's Hospital and Mass General Hospital.

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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