Fullstack Software Engineer
Lever Test, 17 Station St 3rd Floor Brookline 02445
- Pay
- Not listed by the employer
- Work type
- Remote
- Level
- Not stated
- Area
- Software engineering
- Posted
- Apr 8, 2026
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About the role
Job Title: Senior Full Stack Software Engineer (React, MongoDB, TypeScript)
Location: [Remote / Hybrid / On-site – specify] Employment Type: Full-Time Experience Level: Senior (5+ years)
About the Role
We are seeking a highly skilled Senior Full Stack Software Engineer to design, build, and scale modern web applications using React, MongoDB, and TypeScript. You will play a critical role in shaping architecture, mentoring developers, and delivering high-quality, performant software solutions. This role requires both deep technical expertise and strong collaboration skills.
Key Responsibilities
Full Stack Development
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Design and develop scalable, high-performance web applications using React (frontend) and Node.js (backend).
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Build and maintain RESTful and/or GraphQL APIs.
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Develop reusable, modular, and maintainable components using TypeScript across the stack.
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Implement responsive UI/UX designs with a focus on usability and performance.
Backend & Database
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Design, implement, and optimize MongoDB schemas and queries.
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Ensure data integrity, security, and performance in distributed systems.
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Build robust backend services with proper error handling, logging, and monitoring.
Architecture & System Design
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Lead system design discussions and contribute to architectural decisions.
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Optimize applications for maximum speed and scalability.
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Evaluate and introduce new technologies and best practices.
Code Quality & Best Practices
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Write clean, testable, and well-documented code.
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Conduct code reviews and enforce engineering standards.
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Implement automated testing (unit, integration, end-to-end).
Collaboration & Leadership
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Work closely with product managers, designers, and other engineers.
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Mentor junior and mid-level developers.
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Contribute to agile processes, sprint planning, and technical roadmaps.
Required Qualifications
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5+ years of professional experience in full stack development.
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Strong proficiency in:
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React (hooks, state management, component architecture)
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TypeScript (advanced typing, generics, interfaces)
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Node.js (Express or similar frameworks)
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MongoDB (schema design, aggregation pipelines, indexing)
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Experience building and consuming RESTful or GraphQL APIs.
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Listed on Lever Test's Lever job board; checked 8 h ago. First seen by us 2 days ago. Being listed doesn't mean the team is actively interviewing. We found this board in a public directory and haven't yet confirmed it against the company's own careers page.