Fullstack Developer Internship
Are you looking for a full-time internship where you’ll actually build real stuff, learn a ton, and have fun doing it?
At Sid, we’re transforming how B2B SaaS companies reach decision-makers through ultra-targeted advertising, and we’re looking for a fullstack intern to help us level up our internal tools and platform. If you’re curious, eager to code, and want to be part of a fast-moving, collaborative team—this one’s for you.
About Sid
Sid isn’t your typical marketing agency—we act as a growth engine for B2B SaaS companies. Through razor-sharp audience targeting, compelling creative, and data-driven campaigns, we help sales teams generate leads, shorten sales cycles, and stand out in crowded markets.
We’re a tight-knit team of 2 developers, working closely with sales and operations to build tools that power everything we do. And now, we’re ready to bring on our second fullstack developer - you.
About the role
As a Fullstack Intern, you’ll collaborate directly with the product and tech team to deliver internal tools and features that impact our day-to-day operations and client campaigns. You’ll work on building user interfaces, developing APIs, and designing backend logic in a real production environment from day one.
This isn’t a “watch-from-the-sidelines” internship. You’ll be:
Building Frontends: Designing and developing functional and beautiful UIs using modern frontend frameworks.
Developing Backends: Creating clean, scalable APIs and server-side logic to support new tools and services.
Integrating Systems: Connecting third-party platforms, marketing tools, and databases to streamline operations.
Improving UX: Continuously iterating on product design based on internal feedback and real usage.
Shipping Code: Contributing to real sprints with support from senior developers, product managers, and users.
About You
You don’t need 5 years of experience. We’re looking for someone smart, curious, and ready to learn. You’re probably studying computer science, design, or a related field (or you’re self-taught and love building stuff).
You should apply if:
You’ve built or contributed to fullstack projects on your own or in school.
You understand how APIs and databases work together in modern web apps.
You care about building usable, well-structured, clean code—not just getting it to work.
You enjoy working in a tight-knit, collaborative team with quick feedback loops.
You’re looking for a full-time internship where you’ll do meaningful work that ships.
Nice-to-Haves:
Experience with tools like React, TypeScript, Node.js, Express, or similar.
Understanding of Git, CI/CD, and collaborative development practices.
Familiarity with databases (SQL or NoSQL), ORMs, and auth workflows.
Interest in UI/UX, system design, or performance optimization.
What We Offer You 🫵🏻
Hands-On Learning: Work with modern tools and frameworks in a real production environment.
Mentorship & Feedback: Collaborate with experienced developers who love sharing knowledge.
Ownership: Your work will ship. Your decisions will matter.
Startup Energy: Fast-moving, high-learning environment where you’ll never be bored.
Hybrid Flexibility: We’re remote-first but love co-working when it makes sense.