Carbion

Carbion is building a cleaner, more resilient energy future by transforming biomass into battery-grade graphite for next-generation energy storage. Our patented thermochemical process enables the world’s first sustainable, domestic graphite production.

We are seeking a Materials Science / Chemical Engineering / Mechanical Engineering R&D Intern to help develop, characterize, and optimize Carbion’s graphite for battery applications.

Internship – in person
Company HQ – Brooklyn

The intern will support Carbion’s research and development, assisting in experimental design, material synthesis, and analytical characterization. Projects will contribute to understanding and improving process optimization, scale-up, and data collection.

Responsibilities include:

• Conducting experimental runs and process monitoring (temperature, gas flow, etc.).
• Characterizing materials using Raman, XRD, SEM, and TGA.
• Recording and analyzing data to correlate structure–property relationships.
• Perform basic machining and prototyping (drilling, cutting, or CNC operation where applicable).
• Maintaining equipment, documentation, and lab safety and assisting in troubleshooting.
• Conducting mass and energy balance calculations and process modeling.
• Preparing technical documentation and presenting data to the team.

This is a hands-on laboratory role with the opportunity to work directly on materials.

Skills and Experience

• Experience with materials synthesis, reactors, thermochemical processes, and process modeling.
• Hands-on experience with analytical tools (Raman, XRD, SEM, or TGA).
• Strong problem-solving and organizational and experimental documentation skills.
• Familiarity with instrumentation, sensors, data acquisition, or control systems.
• Experience with mechanical fabrication, prototyping, or shop tools (mill, drill press, CNC, or equivalent).
• Familiarity with Microsoft Excel or Python for data analysis.
• Prior R&D or lab experience in a thermal or chemical process setting is preferred.

Attributes

• Curious, self-driven, and adaptable in a fast-moving startup environment.
• Comfortable working hands-on with lab equipment and tools.
• Ability to operate independently in a startup lab environment.
• Strong communication and collaboration skills.
• Passionate about sustainability, clean energy, and advanced materials innovation.

Durability

Over 50% of sports injuries lead to re-injury, often because athletes return to training before addressing the root cause. Injury isn’t just a moment, it’s a process that starts long before the tear and lingers long after the comeback. Every athlete knows the frustration: months of work, the thrill of getting back, only to break down again. We built Durability to end that cycle.

Using computer vision and AI, we analyze movement, predict risks, and guide lasting recovery. We track progress and deliver personalized plans that keep athletes durable and at their peak. Whether rehabbing a major injury or staying ahead of the smaller ones, Durability turns injury prevention into an advantage.

Internship – in person or remote
Company HQ – Boston

We’re looking for an intern with software engineering knowledge and experience who’s excited to work on a real product at an early-stage startup. Ideal candidates have experience with mobile development and are comfortable working across the stack. Experience or interest in UI/UX design, data pipelines, analytics, computer vision, or machine learning is a plus. The role will involve contributing to product features, refining app flows, building foundational analytics, exploring models that connect movement data to performance and injury insights, and supporting integrations with other apps/platforms. Curiosity, initiative, and comfort working on open-ended problems are important.

Potential Projects or Responsibilities

• Contribute to product feature development across the application
• Refine application UI/UX flows
• Design and implement foundational event logging and analytics
• Explore models connecting movement data to performance and injury insights
• Support integrations with platforms such as Strava, Whoop, and Garmin

Preferred Skills & Qualifications

• Background in software engineering or computer science
• Experience with mobile or web application development
• Ability to work independently and collaborate in a small team
• Strong problem-solving skills and comfort working in evolving systems

What You’ll Gain

• Direct exposure to building an early-stage startup
• Ownership over meaningful projects that ship and are used in practice
• Opportunity to contribute ideas and influence product direction
• Exposure to early customers and insight into product, technical, and business decisions
• Support and mentorship from the founding team throughout the internship

Helix Carbon

Based in Cambridge, MA, Helix Carbon is an electrochemistry startup combating the fossil fuel reliance of the steel industry by converting point-source CO₂ emissions into carbon-neutral fuels that replace fossil fuels. Utilizing innovative catalysts and materials developed in-house, Helix creates CO₂-based carbon feedstocks that can make ironmaking cleaner and cheaper than traditional fossil-based methods. Our drop-in electrolyzers integrate with existing petrochemical & steel facilities to upcycle CO₂ emissions into valuable feedstocks.

Internship – mostly in person, some remote work possible
Company HQ – Cambridge

As a member of our engineering team, you will help with the development and preparation of our novel CO₂reduction cell for scaled industrial decarbonization.

This is a full- time, in-person role at Helix Carbon in Cambridge, MA. You will have a hand in the design and modeling of our electrolyzer systems, including thermal and fluid dynamics simulations to guide the development of our CO₂ conversion system. The role also involves collaborating with our multidisciplinary team to iterate on cell design as well as balance of systems including fluid management.

Who You Are

• You love getting your hands dirty. You are comfortable with the theory behind the science, but you also aren’t afraid to jump in and build things, experiment with new materials, and test systems until they break.
• You can connect the modeling to the physical. You have good intuition about the physical impact of design changes. You understand how to ask the right questions to validate those intuitions, then answer them with software tools that reduce experimental cost and time.
• You can connect the science to the big picture. You are passionate about applied research and driving real-world impact. That desire motivates your scientific priorities, and you bring the lenses of manufacturability and safety to design. You’re a strong communicator who can structure and illustrate these complex research goals and methods clearly.

Your Responsibilities]

• Help design, build, test, and optimize gas-phase electrochemical cells for the conversion of carbon dioxide into value-added chemical products.
• Conduct flow-field analysis to determine optimal gas flow through our systems, as well as identify any potential issues prior to manufacture.
• Participate in design-for-manufacturing initiatives as we scale our system to pilot plant size.

Your Qualifications

• Degree candidate in mechanical engineering or chemical engineering.
• Experience with CAD software is required.
• Strong communication skills and ability to present technical information clearly in written and verbal form.
• Experience with Microsoft suite.
• Experience with ASPEN+ or other chemical process simulation software is a plus, but not required.

We believe a circular, renewable materials economy is possible through electrochemistry – if you’d like to be a part of that mission, submit your resume and any relevant additional documents through this posting.

KIRA

KIRA is the universal solution to the toughest wastewaters. We transform liquid waste streams into ultrapure water and solids, lowering disposal costs and enabling resource recovery. Wastewater production plagues all critical industries – from data centers and manufacturing to domestic drinking water treatment plants. Traditional liquid waste disposal is costly, logistically challenging, often requires significant footprint, and is a regulatory nightmare. We are tackling this by electrifying a traditionally steam-driven technology that catalyzes the natural water cycle, transforming the toughest waste streams into clean water and simple solids. Our products require minimal maintenance, are modular and deployable, and run efficiently on electricity – enabling them to be adapted to industrial applications from on-grid metal shops to off-grid mining sites. Long-term, we have a vision for implementing this technology in developing areas around the world, providing long-standing resilience where membrane-based technologies fail.

Internship – in person, hybrid possible
Company HQ – Boston

We are looking for a motivated intern who is driven by the opportunity to make a foundational impact with an expeditious team and innovative technology. The successful candidate will be a fast-learner, curious, and flexible to the dynamic environment of a rapidly growing company. This person will be directly responsible for improving the company performance via:

• Aiding in the fabrication, construction, and sourcing of an industrial-refrigerator-sized prototype thermal hazardous wastewater treatment system.
• Conducting testing, writing standard operating procedures, and analysis reports for the current product iteration on synthetic and customer-sampled water and wastewater streams.
• Assist in market and value-chain analysis, financial modeling and competitive technological analysis.
• There is potential to travel (local, some wider-US potential) to customer field sites for interviewing, sampling, and pilot operation.

This individual will report to the CEO and secondarily to the CTO. The individual will ultimately enable and catalyze early-product development and early customer success.

Background and Experience

The ideal candidate will have background experience in both hands-on, practical engineering and business development. One skillset may be weighted higher than the other, but a balance and interest in both are highly desirable. Key skills and prior experience include:

• Minimum 3-years of undergraduate or equivalent work experience.
• Familiarity with fabrication and early-product design: 3D printing, power and hand tools, plumbing, instrumentation/sensing, and automation is desired but not required.
• Understanding of heat and mass transfer concepts, fluids, HVAC, water and/or wastewater treatment.
• Excellent organization, communication, and reporting skills.

LymeAlert

LymeAlert is the first at-home tick testing kit for Lyme disease and other tick-borne diseases. The kit is paired with a computer vision-enabled app that measures test results and collects GIS data. Our goal is to map disease hot spots and use ML to predict where diseases are spreading next. Our vision is to speed up time to diagnosis, build awareness and the ability to prevent disease, and aid in global disease surveillance as tick diseases are a major global threat.

Internship – hybrid, remote is possible for the right candidate
Company HQ – Cambridge

We have a few options this summer for interns:

(1) Wet lab: help with testing ticks in the lab as well as contributing to research around the next several pathogens that we will use for multiplexing our test strips with. (Skills: basic science, wet lab exposure)

(2) Help develop the computer vision test strip reader and AI disease prediction algorithm (Skills: CS experience, data science)

(3) Business development- Our product launches this summer, so evaluating sales metrics, helping identify customers, building awareness and contributing to education around tick borne diseases. May involve helping staff a booth at an event on Martha’s Vineyard.

medikana

medikana is at the forefront of transforming healthcare in Latin America by bridging the gap between innovative medical device manufacturers and LatAm distributors. Founded at MIT, our dynamic and rapidly growing startup leverages cutting-edge technology to streamline the process of bringing advanced medical technologies to market, improving healthcare access and outcomes for millions of people.

Our platform is designed to centralize and simplify the commercialization process for medical devices. We provide medical device manufacturers with a seamless way to find reputable distributors, prepare regulatory registrations, train local sales teams, and manage relationships with partners. By streamlining the full sales cycle, we provide manufacturers with significant growth opportunities while increasing access to medical technology across Latin America.

We are looking for a highly motivated intern who wants real ownership in a fast-growing startup. Depending on your interests and strengths, you may work across AI development, automation, product strategy, sales, or business operations. You will work directly with the founders to design, prototype, and implement technology solutions that improve how medical devices expand into global markets. This is a hands-on role with real ownership, your work will directly impact product capabilities and company growth.

Internship – in person in Florida or remote
Company HQ – Miami

Potential Focus Areas

AI & Platform Development

• Build AI models for distributor-product matchmaking
• Develop regulatory intelligence tools
• Improve data systems and platform features
• Design automation workflows

Business Strategy & Market Expansion

• Conduct market research on global MedTech markets
• Support go-to-market strategy development
• Analyze distributor and manufacturer performance and growth opportunities
• Develop strategic expansion frameworks

Sales & Growth

• Support outbound strategy and partnership development
• Help refine CRM workflows and sales funnel analytics
• Design lead qualification systems
• Assist in investor and client materials

Operations & Systems Building

• Optimize internal processes
• Design dashboards and reporting tools
• Improve automation across the company

Rheyo

Rheyo is an MIT spinout oral health startup developing novel treatment systems for dentistry. Backed by VC and angel investors and supported by NSF grants, we combine chemistry, materials science, and bioengineering to create faster, more comfortable, and less invasive dental treatments. Interns work closely with the founding team on hands-on R&D, prototyping, and testing of real product concepts for everyday dental practice.

Rheyo values learning, asking good questions, and testing ideas against real-world clinical feedback. We collaborate closely with practicing dental professionals and encourage thoughtful iteration, open discussion, and challenging assumptions. Interns receive close mentorship and meaningful responsibility on work that directly informs product decisions.

Internship – in person, remote is possible if project allows
Company HQ – Cambridge

We are seeking a curious, self-motivated college intern to join our R&D efforts this summer. The role is flexible and tailored to intern interests and strengths. Interns will focus on one primary project track, with opportunities to explore others as time allows. Some projects may be eligible for remote work.

Project Tracks (Choose One Primary Focus)

(1) R&D Prototyping – Electrically Mediated Delivery Systems

• Design and prototype electrode configurations for Rheyo’s proprietary electrically mediated delivery platform
• Explore new therapeutic indications beyond tooth whitening
• Support benchtop testing, iteration, and design documentation

(2) Diagnostic Concept Development – Saliva & Gingival Fluid

• Research biomolecular targets in saliva or gingival crevicular fluid
• Evaluate feasibility of future in-office diagnostic concepts
• Support early-stage assay or system concepts through literature and experimental work

(3) Formulation & Chemistry Optimization

• Assist with formulation development for products including whitening gels, polymeric gingival barriers, and remineralization gels
• Support lab testing, stability studies, and performance evaluation

Who We’re Looking For

• Current undergraduate student in engineering, chemistry, biology, materials science, or a related field
• Comfortable with open-ended technical problems and learning new topics
• Interested in hands-on experimentation, prototyping, or applied research
• Strong critical thinking and communication skills
• Prior lab experience helpful but not required—curiosity and initiative matter most

What You’ll Gain

• Direct mentorship from the founding team
• Hands-on experience in an early-stage, NSF-supported startup
• Exposure to medical devices, applied chemistry, and dental innovation
• Work that directly influences real product development

Tarragon

Tarragon (delta v ’24) is building the AI-powered operating system for restaurant back-of-house — automating forecasting, inventory, purchasing, and invoice workflows to help operators control food costs, reduce waste, and run more predictable businesses. Today, Tarragon powers daily operations across 50+ restaurants, including leading Boston restaurants such as Bakey and Revival Cafe. It was founded by MIT graduates with deep expertise in restaurant finance and building production-scale software.

Internship – remote
Company HQ – Cambridge

At Tarragon, we move fast, ask tough questions, and build real solutions — helping restaurants cut waste and make staff’s lives easier. We’re a small team, so everyone has a big impact in directing the vision of Tarragon. We value giving/receiving honest feedback. Lastly, we respect food as more than just fuel.

About the Role

We are looking for a Fullstack Engineering Intern to join our team for Summer 2026. As an intern at Tarragon, you will join our high-ownership engineering team where you’ll ship production code, tackle challenging bugs, and see your work used in real kitchens within days.

What You’ll Do

• Contribute to the development of our web and mobile applications using React, React Native, Ruby on Rails, and Python.
• Improve application performance, reliability, and scalability on Google Cloud Platform (GCP)
• Collaborate with customers, engineering, and product to build seamless user experiences
• Write clean, maintainable code backed by tests
• Participate in code reviews, stand-ups, and product discussions

What We’re Looking For

• Experience with full-stack engineering (TypeScript, React, Ruby on Rails)
• Passion for building software that creates real impact in kitchens and for restaurant teams
• Interest in AI/ML and automation is a plus
• Strong communication and problem-solving skills, eagerness to experiment with new technologies, and ability to work independently

Why Join Us?

• Make a Real Impact – Use AI to cut food waste and transform restaurant operations.
• Build for Real Customers – Work on production systems that businesses rely on daily.
• Full Ownership – Take ownership of features end-to-end, from design to production, and see their impact in real kitchens within days.
• Collaboration – Work closely with founders, engineers, and operators shaping the future of restaurant operations.

Thinkstruct

Thinkstruct is building AI-powered infrastructure for patent intelligence. Our platform helps patent professionals quickly identify overlaps, assess novelty, and strengthen IP positions using state of the art information retrieval approaches. We turn dense legal and technical documents into actionable insight.

We’re an early-stage team with deep technical roots and a clear mission: accelerate and improve decision-making in intellectual property. If you’re excited about working at the frontier of AI, search, and legaltech, we’d love to meet you!

Internship – in person
Company HQ – Cambridge

Why Thinkstruct?

• Work on innovative projects with cutting-edge technologies
• Opportunities for professional growth and development
• A collaborative and dynamic work environment
• Completely flexible work arrangements, in regard to hours and schedule.
• Unique in-person office spaces in Cambridge.

(1) We’re hiring a full-time Machine Learning Engineer to join our core team and help build the future of patent intelligence tooling. This is an opportunity to lead state of the art AI research projects, build large scale training pipelines, evaluate model performance in real-world applications, and develop cutting edge information retrieval systems.

You’ll work closely with our CTO and founding team in a fast-moving, collaborative environment. The exact scope of your work will depend on your interests and strengths, but may include:

• Developing AI models—from research ideation to applications
• Building infrastructure for AI-driven patent analysis and searching
• Designing and implementing scalable information retrieval systems

What We’re Looking For

• Strong proficiency and familiarity in Python, natural language processing, attention based NN architectures, data pipelines, and scalable GPU processing.
• Bonus: Experience with legal text processing and mechanistic interpretability
• Ability to work independently, utilize strong communication, and maintain a collaborative mindset in a fast-paced environment

(2) We’re hiring a full-time Frontend Engineer to join our core team and help build the user-facing experience of our patent intelligence platform. This is an opportunity to own how advanced AI systems are translated into intuitive, fast, and polished interfaces for real users.

You’ll work closely with our CTO and founding team in a fast-moving, collaborative environment. The exact scope of your work will depend on your interests and strengths, but may include:

• Building and maintaining customer-facing frontend applications using React / Next.js
• Implementing intuitive, human-centered UX components and workflows that integrate with backend and AI-driven APIs
• Working with users to enhance UX experience and grow product workflows
• Collaborating closely with design and backend teams to rapidly ship and iterate on features

What We’re Looking For

• Proficiency in TypeScript or JavaScript, with experience building interactive applications in React or Next.js
• A strong interest in user experience and human-centered design, especially for complex, technical products
• Ability to work independently, utilize strong communication, and maintain a collaborative mindset in a fast-paced environment

(3) We’re hiring a full-time Full Stack Software Engineer to join our core team and help build the future of patent intelligence tooling. This is an opportunity to shape foundational systems, contribute meaningfully to product direction, and work across the stack—from backend services and AI pipelines to frontend interfaces.

You’ll work closely with our CTO and founding team in a fast-moving, collaborative environment. The exact scope of your work will depend on your interests and strengths, but may include:

• Designing and implementing scalable backend services in Python
• Building infrastructure for AI-driven patent analysis and searching
• Maintaining and deploying production-ready distributed compute clusters

What We’re Looking For

• Strong proficiency and familiarity in Python, Docker, scalar & vector databases, RESTful APIs, and AWS services.
• Bonus: Experience with legal text processing and semantic search
• Ability to work independently, utilize strong communication, and maintain a collaborative mindset in a fast-paced environment