Fullstack Engineer (Python+React)

About the team

Billing team owns one of FunnelFox's most strategic products. Billing is a core part of our payments ecosystem and a key driver of the company's growth. The product has already reached product-market fit and is now entering the next stage: scaling the platform, expanding functionality, and building the best billing solution for the Web2App market.

Why we're hiring

We're looking for a Senior Fullstack Engineer (balanced towards frontend) to help us build the most usable and seamless experience for our customers.

You'll combine technical expertise, product thinking, and feature ownership to help shape the roadmap, improve reliability, and build features that directly impact customer value and company revenue.

What you'll do

• Own the Billing back-office end to end — a React application you'll shape yourself, including UI decisions (we work without a designer here)

• Design and ship v2 of our public API

• Own our client SDK: speed up initialization, build out telemetry, improve reliability

• Build and maintain integrations with payment providers — webhooks, async flows, idempotency

• Participate in technical discovery and decomposition, not just ticket implementation

• Investigate and resolve production and payment-related issues

   

You'll be a great fit if you have

• 4+ years of professional frontend development with React and TypeScript

• 2+ years of professional backend development with Python

• Understanding of basic architectural patterns

• Proven ability to solve complex technical problems and deliver scalable solutions.

• Strong communication skills and ability to collaborate across teams.

• Fast learner, adaptable to new technologies, proactive and motivated.

• Experience working in dynamic, product-focused environments.

• English proficiency at B1 level or higher.

Nice to have:

• Experience building or maintaining a client-facing SDK or public library

• Experience with payment systems, PSPs, or subscription billing

• Experience with observability, monitoring, or incident handling

What you may expect from working with us:

• Flexible remote work: Work from anywhere with a schedule that fits your life. Our core team operates in Europe, and we welcome candidates worldwide using Deel.com.

• High ownership and real impact: Engineers actively influence product and technical decisions, not just implementation details.

• Fast-moving startup environment: We value speed, autonomy, and practical problem-solving over rigid corporate processes.

• Direct communication: We keep things simple and transparent, ensuring you focus on what matters most — getting things done.

• Professional Support: We provide a monthly budget that you can allocate based on your personal and professional priorities — including language learning, professional development, mental health support, sports, or health insurance.