Junior Fullstack Developer – Billing & Monetization

Who We Are

Glassix is a leading SaaS messaging platform transforming how top brands communicate with their customers. We process millions of interactions across WhatsApp, Facebook, and Instagram, leveraging cutting-edge AI, NLP, and Automation to create seamless experiences.

Founded in 2017, we've built a robust, high-growth product that powers hundreds of businesses. At Glassix, we value autonomy, curiosity, and high-impact initiative. If you're a builder who wants to see your code affect millions of users in real-time, you belong with us.

The Role

Every conversation on Glassix eventually becomes a line on an invoice. We're looking for a Junior Fullstack Developer to join the team that owns our billing platform: the system that meters usage across millions of messages and turns it into plans, invoices, and payments.

Billing is one of the best places to learn how a SaaS company really works. You'll see how product decisions become pricing, how pricing becomes code, and how code becomes revenue. You'll work with experienced engineers who will help you grow, and you'll ship real features that customers rely on every month.

What You'll Do

• Build and ship billing features end to end, from database to React UI

• Work on usage metering, subscription plans, and pricing logic as new products and channels launch

• Help maintain our integrations with payment providers and invoicing flows

• Learn to design reliable, well-tested processes for tricky cases like upgrades, downgrades, proration, retries, and refunds

• Build the customer-facing billing experience: plan management, usage dashboards, and invoice history

• Collaborate with Finance, Product, and Customer Success to turn business rules into working software

• Take part in the full development cycle: design, development, code review, deployment, and monitoring

Our Tech Stack

• React

• .NET Core

• MS SQL, Redis, MongoDB, and Elasticsearch

• Cloud: AWS, Azure, GCP

Who You Are

We're looking for someone who:

Has some hands-on experience with web development (React, .NET, or similar), whether from work, studies, or personal projects Is comfortable with SQL and understands the basics of working with relational data Pays attention to detail and cares about getting things right, not just getting them done Enjoys solving complex problems and thrives in a fast-paced startup environment Takes ownership, has a proactive mindset, and isn't afraid to ask questions or challenge the status quo Is eager to learn, adapt, and contribute to a growing team

Why Join Us?

Make an impact: Billing is how the company gets paid. Your work will be directly tied to revenue and customer trust from day one. Collaborate & grow: Work alongside experienced engineers who value mentoring and knowledge-sharing. Exciting challenges: We're scaling fast, and monetization is evolving with us. There's no shortage of interesting problems.

What to Expect

Things move fast here-priorities can shift as we learn and grow. We love fresh ideas! If something in our pricing or billing flow doesn't seem right, we want you to speak up. There's some legacy code, but nothing scary-we're constantly improving and refactoring. Precision matters in this domain. We test carefully, review thoroughly, and we'll teach you how we do it.

Requirements

• A degree in Computer Science or a related field is required.

• 5 Matriculation units in Math/Physics

• We are looking for someone who can start immediately.

If this sounds like the kind of place where you’d thrive, let’s talk!