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.

Internal Medicine Physician

Company: Mass General Brigham Community Physicians

Location: Salem/Danvers Hutchinson Drive/ Danvers COC, MA

Posted Jan 20, 2025

North Shore Physicians Group, the largest multi-specialty physician group serving Boston's north shore, offers a proven path to excellence. They respect physicians' insights and vision, fostering a culture of evolution and innovation. Benefits include no call coverage, competitive salary, productivity-based incentives, integrated care model, teaching opportunities, clear career advancement paths, work-life balance support, and ideal locations with high quality of life.

OB Laborist Physician

Company: Mass General Brigham Community Physicians

Location: Salem, Massachusetts

Posted Jan 12, 2025

North Shore Physicians Group, a physician-led organization, offers innovative healthcare with a focus on improving patient-provider relationships. As an OB Laborist, you'll enjoy system stability, work at a top-rated hospital, collaborate with exceptional nursing partners and specialists, and benefit from a supportive work-life balance. Compensation and benefits are excellent, with opportunities for professional growth in a high-quality life setting.

Endocrinologist

Company: Mass General Brigham Community Physicians

Location: Haverhill, Massachusetts

Posted Jan 12, 2025

Mass General Brigham is recruiting a community-based Endocrinologist for an outpatient position in Haverhill, MA. The role involves diagnosing, treating, and managing patients with endocrine disorders. The ideal candidate should have strong clinical skills, excellent communication, and a commitment to patient care. Responsibilities include diagnosing various endocrine disorders, collaborating with a multidisciplinary team, and providing patient education. Benefits include a competitive salary, comprehensive benefits package, CME allowance, and retirement savings plan.

Adult Inpatient Psychiatrist Position

Company: Mass General Brigham Community Physicians

Location: Salem, Massachusetts

Posted Jan 21, 2025

The Department of Psychiatry at Salem Hospital offers a full-time or part-time BC/BE adult inpatient psychiatrist position. The Epstein Center for Behavioral Health is a 120-bed facility affiliated with Massachusetts General Hospital, featuring adult, child/adolescent, and geriatric units. The position includes opportunities for teaching, research, and participation in the Consultation-Liaison service or Adult Outpatient Department. Salaries are competitive, and the location is near Boston.

Full-Time Armed Cleared Security Officer

Company: Securitas Critical Infrastructure Services

Location: San Antonio, TX

Posted Jan 17, 2025

Ideal candidates will use their passion for security coupled with an ability to thrive amid challenges. Employee Discounts: Vehicles and Cell Phones.

General Orthopedic Surgeon

Company: Mass General Brigham Community Physicians

Location: Dover, New Hampshire

Posted Jan 13, 2025

WHP Seacoast Orthopedics and Sports Medicine is recruiting an experienced General Orthopedic Surgeon with 5-25 years of experience. The role involves acute care, orthopedic trauma, and general orthopedic surgery. The practice includes eight fellowship-trained orthopedic surgeons and offers a supportive team environment, work-life balance, competitive compensation, and professional growth opportunities. The position is located in the scenic Seacoast region of New Hampshire.

Portfolio Manager-Security Services

Company: Securitas Critical Infastructure Services

Location: Pleasanton, CA

Posted Dec 30, 2024

Lead and manage field operations across multiple client sites. Participate in client reviews, develop proposals, and execute service strategies.

Per Diem - Wound Care Physician

Company: Mass General Brigham Community Physicians

Location: Dover, New Hampshire

Posted Jan 21, 2025

Wentworth Douglass Hospital, part of the Mass General Brigham system, is recruiting a skilled Wound Care Provider (MD/DO) for a per diem position in Dover, NH. The role involves managing complex wound conditions, utilizing advanced techniques, and collaborating with a multidisciplinary team. The ideal candidate should have board certification, minimum 2 years of wound care experience, and active medical licensure in New Hampshire. Dover, NH offers a blend of outdoor activities, historical sites, and city access.

Child Psychiatrist Opportunity - Near Boston, MA

Company: Mass General Brigham Community Physicians

Location: Salem, Massachusetts

Posted Jan 20, 2025

Mass General Brigham Salem Hospital is offering an exciting opportunity for a child psychiatrist to join their thriving psychiatric service in Salem, MA, about 15 miles north of Boston. The position involves providing outpatient care for children and adolescents, collaborating with primary care providers and psychotherapists, and participating in the Massachusetts Child Psychiatry Access Program (MCPAP). Salem Hospital offers a full spectrum of psychiatric care, including a 30-bed child and adolescent inpatient unit, adolescent partial hospitalization program, and child and adolescent ED consults. The hospital provides a collegial and supportive practice environment with competitive compensation and a reasonable call schedule. Salem, located on the North Shore of Massachusetts, offers the benefits of proximity to Boston.

Business Partner - Payroll Specialist

Company: Salute Mission Critical

Location: Other US Location

Posted Dec 25, 2024

Salute is seeking a dynamic and experienced HR Business Partner Payroll Specialist to join their team and drive relationships with hyperscale clients. The role involves overseeing and ensuring the accuracy of employee payroll data, handling employee inquiries, and managing PTO balances. The specialist will also be responsible for setting up tax accounts, researching payroll discrepancies, and ensuring compliance with legal tax requirements.

Family Medicine Physician

Company: Mass General Brigham Community Physicians

Location: Saugus/Marblehead/Swampscott/Beverly, MA

Posted Jan 12, 2025

North Shore Physicians Group, a physician-led organization and part of Mass General Brigham health care system, offers a proven path to excellence in healthcare. They respect provider insights, foster innovation, and promote a collaborative, team-based care model. Benefits include no call coverage, competitive salary, and clear career advancement opportunities. Ideal locations in the Boston metropolitan area offer high quality of life.

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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