Job Opening for 2026-27
Lower Elementary Montessori Co-Teacher / Montessori-Trained Assistant Teacher (Ages 6–9) in Chelmsford, MA, US
True to Montessori principles, education at Keystone is not limited to ‘academic’ disciplines. Children learn to take care of themselves, their surroundings and their community.
A safe and nurturing environment that supports the innate joy of learning promotes the development of self esteem and cultivates respect for one’s self, for others and for the environment.
Position Summary
We are seeking a certified Lower Elementary Montessori Guide or a Montessori-trained Assistant Teacher to join our team as a Co-Lead Teacher, or a Montessori-trained Assistant Teacher in our program serving 1st–3rd year students (ages 6–9), in response to the continued growth in our Elementary Program. This role is part of a collaborative co-teaching model, working closely with a partner Lower Elementary guide.
The ideal candidate enjoys working with students to foster independence, intellectual curiosity, and social-emotional growth, and collaborates effectively with a co-teacher to support the needs of the whole child. Co-teaching offers the opportunity to share ideas and responsibilities while providing increased social-emotional support and more individualized and small-group lessons, creating a rich and responsive academic environment.
This is a wonderful opportunity for a passionate, creative educator who can plan thoughtfully, problem-solve collaboratively, and thrive in a team-oriented setting.
Key Responsibilities
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Collaborate with a co-teacher to design, prepare, and maintain an orderly, beautiful Montessori environment that meets the developmental needs of children ages 6–9
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Plan and implement individual and small-group lessons that integrate academics with Practical Life, Grace and Courtesy, and Cosmic Education
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Work collaboratively with the co-teacher to set goals, support student growth, and guide the work of individuals and groups
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Present lessons in accordance with Montessori curriculum, pedagogy, and principles
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Educate the whole child by applying Montessori philosophy in a joyful, inclusive, and respectful learning environment
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Actively observe students to identify interests and developmental readiness, guiding them toward appropriate materials that foster mastery and independence
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Maintain accurate and up-to-date records of student work, progress, and behavioral observations using school-designated software platforms
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Participate in chaperoning off site field trips, physical education programs, and Outdoor Classroom experiences during the Spring semester
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Represent the school’s mission and values within the school community and to prospective families
Position Details:
This is a school-year position 8/31/26 through 6/11/27 (Approximately 180 work days). Benefits include paid sick and personal time. Additional days off include 2 weeks during December break, February & April vacation weeks, and major holidays. Pay will commensurate with experience & certification.
Please email resume, cover letter, and 3 references to lisa.ciesluk@keystoneschool.