Full-Stack Developer Intern, Music & Audio

Software Engineering Intern (Greentech) (m/f/d)

Reonic

Build the Operating System of the Energy Transition Most internships have you sitting in meetings, fixing small bugs, and watching others build. This one doesn't. At Reonic, you'll work on software used by thousands of renewable energy companies across Europe. You'll ship real features, solve real problems, and see your code in production within days. We're building the AI-native operating system for renewable installers. And we're looking for ambitious builders who want to learn fast, take ownership, and make an impact from day one. This is a full-time, on-site internship based in Berlin. What makes this internship different * Your work directly impacts how renewable energy gets deployed * You'll ship production code used by real customers * You'll work closely with experienced engineers, product managers, and founders * You'll own projects instead of shadowing others * You'll see the full lifecycle: idea → implementation → customer feedback * No busy work. No "intern projects" disconnected from reality. Just building, learning, and shipping. What you'll build * Develop product features across our React, TypeScript, and Node.js stack * Turn complex business workflows into simple and intuitive user experiences * Work on AI-powered workflows that help installers sell and deliver renewable energy projects faster * Contribute to backend services, APIs, and internal tooling * Debug, improve, and optimize production systems * Collaborate closely with product and design to bring ideas to life And if you're eager to go deeper: * Work with databases and PostgreSQL * Learn about system architecture and scalability * Explore AI integrations and automation workflows * Take ownership of larger features end-to-end This is not a typical internship. It's a playground for builders. You'll thrive here if you... * Love building things and seeing them used by real people * Are curious and learn quickly * Prefer ownership over detailed instructions * Enjoy solving problems, not just writing code * Care about creating great user experiences * Want to work with ambitious people who move fast * Are studying Computer Science, Software Engineering, or a related field Previous startup experience is a plus, but not required. What matters most is your ability to learn, execute, and take ownership. Why join now * Competitive internship compensation * High ownership from day one * Steep learning curve and rapid personal growth * Uber Eats and Uber rides on us when you finish late * Regular team events, great coffee, and a MacBook * A vibrant, collaborative office culture where great ideas happen face-to-face — we're a full in-person team (5 days/week) in a beautiful Berlin office near Hackescher Markt. * Join one of Germany's fastest-growing VC-backed startups Even if you don’t meet every requirement, we encourage you to apply! Imposter syndrome shouldn't hold you back - we value talent and passion above all.   About Reonic At Reonic, we’re on a mission to simplify renewable technology with our AI operating system for renewable installers. Backed by top-tier investors and trusted by 3000+ business customers, we’re growing fast - and we need YOU to help us accommodate our new and existing customers.

Engineering Intern

Knowunity

THE OPPORTUNITY We are building the #1 AI learning companion for 1 billion students globally. We are building a future where every student on the planet can access, enjoy, and benefit from the highest quality education. Since founding Knowunity straight out of high school in 2020, we've been committed to revolutionising how students learn. Millions of students already use our AI learning companion weekly. We just raised €27m - Europe’s largest education round in the past three years. The AI learning market is at an inflection point, finally enabling true personalisation at scale, and we're determined to build the first AI learning unicorn in this space. You will join an elite team of 60 hands-on builders serving 1 billion students worldwide. If we execute on our product vision, you will have built something generational that transforms education globally. This is your chance to be part of building a generational company. YOUR MISSION The problem you’ll solve: You’ll support our fast-moving engineering team in building and improving the product that helps millions of students learn better every day. Your ownership: * Support product managers and engineers in building new product features and improvements. * Help implement core functionalities that directly impact our user experience. * Improve code quality and contribute to our technical foundation as we scale. Why this matters: Knowunity is used by millions of students globally, and we’re just getting started. The features and improvements you help build will directly impact how students learn and grow with us every day. Your work helps us move faster and smarter on our mission to become the #1 learning companion for 1 billion students. What success looks like: You contribute meaningfully to live product features, collaborate closely with senior engineers and the CTO, and develop rapidly as a technical talent. You bring your ideas to the table, take ownership of mini-projects, and leave the internship with the opportunity to join full-time. Our Tech Stack Our app is written in Flutter with Riverpod. Our Golang backend is powered by PostgreSQL and hosted on AWS with Kubernetes. Our AI stack consists of several LLM providers (OpenAI, Gemini, Anthropic, and Mistral), custom routing engines, and fine-tuned models. Our data stack consists of BigQuery and dbt. WHO YOU ARE Your mindset You’re the type of person who: * Builds to learn and learns by building - you love turning ideas into working products and figuring things out along the way * Thinks like a founder - you’re proactive, curious, and unafraid to take ownership in a fast-moving environment * Sees the full picture - whether it’s frontend, backend, or anything in between, you’re eager to contribute across the stack * Cares about users - you’re not just writing code, you’re solving real problems for real people * Leverages AI - as a force multiplier in everything you do * Values excellence over comfort - mediocrity isn’t in your vocabulary Your track record You’re currently studying (or have just finished) Computer Science, Software Engineering, or a related field. You’ve built things you’re proud of — whether in class, side projects, or internships — and you’re hungry to apply what you know in a real-world, high-impact setting. You want to grow fast, contribute meaningfully, and help shape the future of a product users love. Must-haves * Currently pursuing or recently completed a degree in Computer Science, Software Engineering, or similar * Strong programming skills across backend and frontend * Fluent English; German is a plus * Ready to work from our Berlin office 5 days/week (with some flexibility!) WHAT WE OFFER Not for everyone, everything for the right ones. * Competitive compensation: We’re are building Knowunity to dominate the global AI learning market. Your compensation package includes competitive salary (4.000,00 EUR monthly). Team members who help us reach that goal will be rewarded accordingly. * Elite team and true ownership: You’ll work alongside 60 exceptional people who match your ambition within a flat hierarchy - direct access to founders and leadership without bureaucratic middle layers. You'll own entire areas from conception to delivery with real decision-making authority. * Meaningful impact at scale: Your work will have immediate, measurable impact on education globally and directly improves how millions of students learn. * Benefits: 20 days annual leave, mental health support via Nilo, Urban Sports Club, monthly become1 retail vouchers, team and company events We’re not here to coast - we are building something exceptional. We’re a lean team of ambitious people who push hard, move fast, and constantly raise the bar. The real perk is not standard benefits - it’s joining 60 amazing people who challenge you to level up daily. If you’re hungry, thrive under pressure and ready to go the extra mile, this is where you will accelerate your career faster than anywhere else. NEXT STEPS Ready to help build the AI learning unicorn? Click “Apply for this job” and submit your CV and LinkedIn profile. We encourage applications from exceptional talent regardless of traditional background requirements. At Knowunity, we actively foster an inclusive and diverse workplace that ensures equal opportunity for all qualified applicants, regardless of nationality, ethnic or national origin, skin color, religion, sex, gender identity or expression, sexual orientation, physical or mental disability, or marital status. Please refrain from including your picture and age with the application.

Full-Stack Developer, Music & Audio

Melotech

WHO WE ARE Melotech is revolutionizing media and entertainment. We create art through technology for humans to enjoy. In just 24 months, our work has been heard, watched and loved for over 3 billion minutes worldwide. Founded by entrepreneur and investor Soheil Mirpour, we are backed by top VCs Cherry Ventures, Speedinvest and GFC, alongside world-class angels from firms such as Spotify, Blackstone and KKR. WHAT YOU WILL DO As one of our first developers, you will bridge the gap between beautifully designed frontends and scalable backends. You'll tackle the big questions: How do we build systems that scale while maintaining simplicity? What’s the fastest way to ship the right amount of function? And how do we leverage AI in every part of our process? Working fully autonomously alongside our founder and the team, your answers to these questions will directly influence our company's success. On a typical day, your tasks may include: * Owning features across our full stack, writing clean code for both frontend and backend systems * Working directly with commercial teams to architect and implement platform enhancements * Using AI coding assistants and modern development tools to accelerate workflows and maintain code quality * Building robust APIs and integrating AI models into production systems * Designing end-to-end solutions that combine individual data flows into unified models across verticals * Thinking of creative ideas and making bold decisions that shape our technology platform WHO YOU ARE We're looking for creative, ambitious and skilled full-stack engineers who can drive our business with technical solutions. You're someone who doesn't just write code, you translate ideas into software that is easy yet powerful, leveraging AI-enhanced workflows to deliver production-ready MVPs at lightspeed. Typically, your profile will look like this: * Degree in CS or related field with 2+ years of full-time full-stack development experience * Proficient in core programming languages with hands-on experience in modern web frameworks (preferably Node.js/Next.js) and databases * Expert with AI coding tools and development agents as part of your standard workflow * Experience building and deploying production-ready full-stack applications * Strong collaboration skills across commercial, product, and technical teams * Always on the forefront of adopting the latest development technologies * You thrive in a fast-paced and performance-oriented environment * Colleagues would describe you as hard-working, ambitious and persistent * You’re obsessed with music, video or social media WHAT MAKES THIS EXCITING You are one of the first employees of an ambitious team, changing the world of media and entertainment. Being early means every decision you make shapes our trajectory. You're not a cog in the machine but the captain of your own ship, rewarded for performance and respected for leadership. Flat hierarchies mean that your voice matters, your ideas get implemented, and your impact is immediate. We pay competitive salaries and make you an owner of the business with equity. We work remotely to give you complete freedom over your life, while meeting regularly around the world for global offsites where we strategize, bond, and push boundaries together. WHAT THE PROCESS WILL LOOK LIKE We hire on a rolling basis. Earliest starting date is always ASAP. Once you begin our process, you can progress from start to offer within a week, depending on how quickly you can move through each stage: 1. Online assessment: Motivational questionnaire and aptitude test - are you made for the job? 2. Initial interview: 30-minute introductory call - getting to know you 3. Take-home case study: Real-world project - showcase your skills and working style 4. Case interview: 90-minute case discussion - present and debate your results with a team member 5. Founder interview: 90-minute interview with our CEO - going deep on all topics 6. Team interview: Individual or group interview with other team members - depending on position 7. Offer, contract signing and onboarding Note: As we are still in stealth, you will learn more about Melotech as you progress through the stages. By the end of the Founder interview, you will have a full grasp of our business and the details of your role.