Full Stack Developer Intern - React JS

Join Otter LLC as a Full Stack Developer Intern specializing in React JS! This internship provides a unique opportunity to work on exciting projects that shape the future of technology.As a Full Stack Developer Intern, you will collaborate with a team of talented engineers, gaining hands-on experience in both front-end and back-end development. You will learn to solve complex problems and contribute to the development of innovative web applications.

Join Otter LLC as a Full Stack Developer, where you will play a pivotal role in crafting innovative web applications. You will leverage your expertise in both front-end and back-end development to deliver robust, scalable solutions that enhance user experience. Collaborate with cross-functional teams to design, develop, and maintain high-quality software that meets our clients' needs.

SciTec, a proud subsidiary of Firefly Aerospace, is a pioneering force in the realm of non-traditional defense contracting, dedicated to delivering cutting-edge technologies that bolster U.S. National Security and Defense initiatives. With over 45 years of experience, our organization has consistently supported Department of Defense clientele by creating innovative remote sensing algorithms, tools, and techniques aimed at enhancing world-class data exploitation capabilities for missions related to missile defense, intelligence, surveillance, reconnaissance, space domain awareness, and aircraft survivability.Important Notice: All employees must be U.S. citizens due to the nature of our government contracts. Applicants who do not meet this requirement will not be considered.We are on the lookout for a Full Stack Software Engineer who will be responsible for designing, developing, and maintaining user-facing web applications alongside backend services tailored for real-time data and geospatial information systems. This position emphasizes the creation of dependable, visually engaging, and high-performance applications that function seamlessly in mission-critical contexts.The ideal candidate should possess a strong capability to navigate the entire stack—from frontend user interfaces to backend data processing pipelines—and excel in a collaborative, Agile development setting.ResponsibilitiesDesign, develop, and maintain both frontend and backend software, encompassing code, tests, and documentation.Build and integrate user interfaces along with data pipelines for real-time and geospatial data visualization.Design, prototype, and implement user-centric interfaces that effectively translate customer needs into intuitive solutions.Maintain and enhance 24/7 user-facing applications that manage, display, and monitor real-time data.Identify and rectify software defects and security vulnerabilities.Collaborate with team members during Agile ceremonies, including standups, sprint planning, and retrospectives.Contribute to architectural discussions and technical design decisions.Ensure adherence to software engineering best practices, including code quality, testing, and maintainability.Support documentation and knowledge sharing across teams.Perform other duties as assigned.

Location: Onsite in Boulder, CO. This position requires working at the Boulder office; remote or hybrid work is not available. Candidates should already be local or plan to relocate before starting. Role overview Foresight Diagnostics seeks a Senior Full Stack Software Engineer with strong Python skills and frontend experience in React. The role centers on designing, developing, and maintaining software that supports research, product development, and clinical testing. Experience with relational databases, especially PostgreSQL, is preferred. Familiarity with next-generation sequencing (NGS) laboratory workflows and data management is a plus. What you will do Design and build full-stack applications using React for the frontend and Python for the backend, with an emphasis on relational database storage. Work closely with scientists, lab staff, and business stakeholders to turn complex requirements into practical, production-ready software. Contribute to architectural decisions, participate in system design reviews, and join sprint planning sessions as part of a collaborative software development team. Maintain high standards for software quality and performance. Requirements Expertise in Python development. Frontend proficiency with React. Experience working with relational databases; PostgreSQL preferred. Ability to work onsite in Boulder, CO. Understanding of NGS laboratory workflows and data management is advantageous.

About FreeplayAt Freeplay, we empower software teams to seamlessly launch exceptional AI products. Our platform enables product development teams to effectively test, assess, monitor, and enhance AI in real-world applications. From dynamic startups to Fortune 100 enterprises, our customers leverage Freeplay to refine LLM features, chatbots, and intelligent agents.The Need for FreeplayWhile interacting with ChatGPT may appear straightforward, creating production-grade software utilizing LLMs presents considerable challenges, particularly for teams lacking prior AI expertise. These teams are eager to accelerate their learning journey and prioritize delivering tangible value to their customers.Freeplay simplifies this journey, enabling teams to swiftly and confidently develop and refine production-ready AI features. Our clients appreciate how we help them save time, sidestep costly errors, enhance their offerings, and empower every team member—engineers and non-engineers alike—to collaborate and deliver faster.Discover more about our initiatives on our blog.Your RoleDevelop and Deliver Software: Architect, create, and sustain foundational infrastructure and features across our comprehensive stack—from user-friendly front-end interfaces to robust backend systems that drive our AI testing and evaluation platform.Influence Technical Strategy: Assess and implement technologies, tools, and best practices while profoundly shaping our technical architecture. Participate in strategic decision-making regarding the construction of reliable systems interfacing with AI components.Prioritize User Experience: Keep the end-user at the forefront of all development stages, ensuring our platform is both intuitive and powerful for teams working with AI, while providing a seamless experience across all functionalities.Collaborate with the Founding Team: Partner closely with our founding team to brainstorm, prototype, and deliver innovative solutions that meet user needs and generate value for our customers.Cultivate Engineering Culture: Establish rigorous testing protocols, code reviews, and continuous integration practices to uphold superior quality in production-ready code while minimizing technical debt.

Location: Onsite in Boulder, COAbout UsAt Foresight Diagnostics, we are pioneering advancements in non-invasive cancer detection through our cutting-edge liquid biopsy technologies that utilize highly sensitive, cell-free DNA. Our proprietary methods, originally conceived at Stanford University, empower earlier detection of smaller tumors, facilitating personalized and effective cancer treatment strategies.Our operations blend molecular biology, bioinformatics, and next-generation sequencing (NGS), transforming scientific innovation into impactful clinical solutions. As we expand, we've established robust laboratory operations and effective cross-functional collaboration, ensuring clinical development and long-term commercial readiness.Foresight Diagnostics fosters a collaborative and accountable work culture where quality, precision, and continuous improvement are integral to our mission. Team members enjoy the chance to contribute to meaningful programs, collaborate with seasoned scientific and operational leaders, and advance professionally within a well-resourced organization dedicated to its mission.Position OverviewWe are looking for a Senior Full Stack Software Engineer who possesses strong Python expertise, frontend skills (preferably in React), and backend experience with relational databases (PostgreSQL is preferred). In this role, you will play a vital part in designing, developing, and maintaining full-stack software solutions that support our research, product development, and clinical testing operations. A solid understanding of NGS laboratory workflows and data management is highly advantageous.This position is onsite in Boulder, CO and does not offer remote or hybrid options. Candidates must either be local to Boulder or willing to relocate before commencing work.Key ResponsibilitiesDesign and develop full-stack applications utilizing React for the frontend and Python for the backend, with an emphasis on database management.Collaborate closely with scientists, laboratory personnel, and business stakeholders to transform complex requirements into practical, production-ready software solutions.Participate in architectural decisions, system design reviews, and sprint planning as part of a collaborative software development team.Ensure that software meets high standards for quality, reliability, and performance.

The Trade Desk is looking for a Senior Full Stack Software Engineer to join the Omnichannel division. This position centers on designing and building software that enhances user experiences across a range of platforms. Projects involve both web applications and integrated advertising technology. Key responsibilities Collaborate with engineering, product, and design teams to deliver applications for the omnichannel platform Develop and maintain software that integrates with The Trade Desk’s advertising technology stack Work on both front-end and back-end systems to support seamless user interactions Locations This role is open in Bellevue, Boston, Boulder, Chicago, Denver, Irvine, Los Angeles, New York, San Francisco, San Jose, Seattle, and Ventura.

Role overview Galileo Learning is looking for a Summer Camp Intern to join their team in Boulder. This internship provides hands-on experience supporting both children and daily camp operations during the summer months. Key responsibilities Assist in planning and leading activities that foster creativity and teamwork among campers Engage directly with children in a lively and encouraging environment Support smooth operation of daily camp routines Location This position is located in Boulder and requires in-person participation throughout the summer session.

Founded in 2014 by former philosophy professor David Barnett, PopSockets is a leading global digital lifestyle brand dedicated to enhancing people's digital experiences through innovative and expressive products. With nearly 300 million iconic phone grips sold across 75 countries, we have expanded our product offerings to include phone cases, wallets, mounts, batteries, and chargers.At PopSockets, our mission is to foster improved mobile functionality, self-expression, and authentic human connections. We envision an Eternal Positivity Machine that ignites joy, creativity, and meaningful interactions. We are committed to delivering on this vision through exceptional standards in materials, packaging, logistics, and design while ensuring ethical and responsible practices throughout our supply chain.In 2021, PopSockets was recognized as one of Fast Company’s Most Innovative Companies in the World.As a key member of the PopSockets Operations team, the Sales Operations Specialist will manage strategic relationships with both National and International accounts, focusing specifically on our International partners. This cross-functional role supports all phases of the sales cycle—from product development and channel market launches to product exit strategies. You will be the go-to expert for account operations.

TIFIN develops AI technology tailored for wealth management. The platform supports investors, advisors, and operations teams, helping financial institutions deliver secure and compliant solutions. The company emphasizes finance-specific AI, specialized data, and enterprise-level controls. TIFIN is known for rapid product development, with MVPs launched in about three months and production-ready products within six to twelve months. The team brings experience from major technology and finance firms, and has a track record that includes acquisitions and partnerships with leading organizations such as J.P. Morgan, Franklin Templeton, and Morningstar. Values Encourage growth and a beginner’s mindset, with a focus on integrity and self-awareness. Promote open communication, honest feedback, and collaborative problem-solving. Emphasize team success, responsibility, and continuous improvement. Role overview The AI Engineering Intern (Summer 2026) will join TIFIN’s internship program in Boulder, CO or Charlotte, NC. Interns work directly on AI systems used by financial institutions, gaining practical experience with production-grade technology. Each intern partners with an AI Engineering leader and focuses on a significant project throughout the three-month program. Exceptional performance may lead to a full-time offer after the internship. Sample project Contribute to developing a multi-agent copilot designed for financial advisors.

Join our dynamic team as a PPM Internal Controls Analyst in Boulder, CO. In this role, you will be responsible for assessing and enhancing internal controls within project portfolio management, ensuring compliance with industry standards, and contributing to the overall growth and success of our organization.

Join our dynamic team as a Store Leadership Intern at dev2, where you will gain hands-on experience in retail management and operational excellence. This internship provides a unique opportunity to develop your leadership skills while working alongside experienced professionals in a fast-paced environment. You will assist in daily store operations, contribute to team objectives, and engage with our customers to deliver an outstanding shopping experience.

We are seeking a talented and driven .NET Developer to join our dynamic team. This is an urgent requirement, and we are specifically looking for Green Card holders and U.S. citizens. If you have a passion for developing high-quality software solutions and possess strong technical skills in .NET development, we want to hear from you!

SciTec, Inc., a proud subsidiary of Firefly Aerospace, is a leading non-traditional defense contractor dedicated to providing cutting-edge technologies that bolster U.S. National Security and Defense. For over 45 years, we have partnered with Department of Defense clients to create innovative remote sensing algorithms, tools, and methodologies that enhance data exploitation capabilities across missile defense, intelligence, surveillance and reconnaissance, space domain awareness, and aircraft survivability missions.We are excited to announce a new opening for a Program Development Manager (PDM) who possesses a robust technical background and a knack for business development. This position, based at our Boulder, Colorado office, requires an on-site presence. As a PDM, you will work closely with our Executive Director of Program Development to align business growth with our strategic initiatives. Your primary responsibilities will include identifying, tracking, and pursuing new business opportunities within designated Strategic Campaigns, leading proposals, and functioning both independently and as part of a team in high-pressure situations.

SciTec, a subsidiary of Firefly Aerospace, stands at the forefront of innovation as a non-traditional defense contractor. With over 45 years of experience, we provide cutting-edge technologies to bolster U.S. National Security and Defense. Our commitment to excellence has empowered the Department of Defense with state-of-the-art remote sensing algorithms, advanced tools, and techniques that enhance data exploitation for critical missions including missile defense, intelligence, surveillance, reconnaissance, space domain awareness, and aircraft survivability.We are excited to announce an immediate opening for a highly skilled Senior Program Development Manager (PDM) who possesses a strong technical background and a proven history of driving business growth. This pivotal role will focus on aligning business development and program initiatives with our strategic goals. This in-office position is located in Boulder, Colorado, and reports directly to the Executive Director of Program Development. The PDM will play a crucial role in identifying, tracking, and capturing new business opportunities within designated Strategic Campaigns, as well as leading proposal efforts.Key Responsibilities:Develop and sustain a robust pipeline of program opportunities within assigned Strategic Campaigns, contributing to the overall corporate strategy.Guide opportunities through a milestone-based process, culminating in either proposal development or a no-bid decision.Serve as Proposal Manager for assigned proposals, coordinating with technical teams to develop compelling proposal content, including technical solutions, win themes, features, benefits, proof points, and visuals.Establish and manage proposal schedules and budgets, ensuring prompt delivery of all necessary content.Create teaming strategies and formulate teaming agreements and subcontract RFPs.Produce marketing materials that effectively communicate SciTec’s capabilities and solutions to clients and industry partners.Provide updates to corporate and portfolio leadership regarding the status and advancements of the new business pipeline and initiatives.Support pre-award activities, including customer inquiries, BAFO responses, and engagement with teammates.

Join our dynamic team at Prosidian Consulting as an ITSM IT Specialist (Developer) in Boulder, CO. In this pivotal role, you will leverage your expertise in IT Service Management to develop and implement solutions that drive efficiency and enhance service delivery.

Join SciTec, a forward-thinking subsidiary of Firefly Aerospace, where we innovate at the intersection of technology and defense. For over 45 years, we have been at the forefront of supporting U.S. National Security and Defense through cutting-edge remote sensing technologies and advanced algorithms. We develop solutions that empower missile defense, intelligence, surveillance, reconnaissance, and more.Important Notice: All positions at SciTec require U.S. citizenship as we exclusively work on government contracts. We are unable to sponsor work visas, and U.S. citizenship is necessary to obtain a security clearance. Applications from non-citizens will not be considered.We are currently looking for a Senior Front End Software Engineer who is passionate about crafting user-centric web applications. This role focuses on delivering complex, real-time data in an accessible and intuitive manner, ensuring high performance and usability in mission-critical systems.The ideal candidate is an experienced frontend engineer committed to code quality, user experience, and system reliability. You will collaborate closely with backend, platform, and systems engineers to achieve our goals effectively.

The OpportunityWe are seeking a talented and experienced Developer Relations Engineer to spearhead initiatives aimed at enhancing the visibility of Freeplay within the AI engineering and product management communities. In this role, you will be instrumental in creating engaging content, fostering community engagement through both online and in-person events, shaping our brand narrative, and executing lead generation strategies directed at technical audiences.This is a fantastic opportunity to join a rapidly expanding AI startup that is at the forefront of AI product development, working with some of the largest and most innovative companies worldwide. You will dive deep into the intricacies of agent building, evaluation creation, prompt optimization, and model enhancement, ultimately contributing to the development of AI products that deliver exceptional customer satisfaction.About FreeplayFreeplay is the comprehensive platform that empowers software teams to develop outstanding AI products. We equip product development teams with tools to test, evaluate, monitor, and optimize AI in production. Our clients range from emerging startups to Fortune 100 companies, all utilizing Freeplay to enhance their LLM features, chatbots, and agents.Your MissionYou will be responsible for crafting the messaging and content that will establish and expand Freeplay's developer community and stimulate growth.Foster and amplify Freeplay’s brand presence within the AI engineering and product management sectors through thought leadership, technical writing, and community interaction. Become a prominent public representative for Freeplay over time.Direct the creation and strategic vision for high-quality technical materials, including sample code, applications, documentation, blogs, videos, webinars, and tutorials.Continuously refine our narrative to highlight what makes Freeplay distinct and impactful.Ensure that all content is engaging, clear, and effectively illustrates Freeplay’s value proposition to technical audiences.Establish a consistent rhythm of content marketing and nurturing campaigns that effectively blend enterprise messaging with practical, actionable solutions for AI engineers and product managers.Collaborate closely with Product Management, Engineering, and Sales to maintain aligned and powerful messaging.

Are you a creative and skilled Web Designer/Developer with a passion for IT Service Management (ITSM)? Join our dynamic team at Prosidian Consulting, where you will have the opportunity to craft innovative web solutions that enhance IT service delivery. You will work collaboratively with cross-functional teams to design, develop, and implement user-friendly web applications that streamline IT operations.

Join Prosidian Consulting as an ITSM Applications Development Specialist in the vibrant city of Boulder, Colorado. In this pivotal role, you will leverage your expertise in IT Service Management to enhance application development processes and deliver exceptional IT solutions. Collaborate with cross-functional teams to implement best practices, ensuring the seamless integration of ITSM frameworks within our client organizations.