Senior Full-Stack Product Engineer (Startup, SaaS, Amsterdam)

SOUS; Amsterdam; On-site; Confidential; Full time

Benefits offered by this job

Equity

Competitive salary

On-site with flexible options

Job summary

SOUS in Amsterdam is seeking a Senior Full-Stack Product Engineer to lead a growing engineering team while shipping high‑impact features. You’ll own core backend in Django and frontend in React/TypeScript, architect multi‑tenant SaaS, and drive API design with Shopify/Mendrix integrations.

We value hands‑on leadership, strong testing culture (Pytest, React Testing Library), and a passion for scalable, robust code.

Qualifications

• 10+ years as a full-stack developer with SaaS experience.
• Proficient in Python (Django) and JavaScript/TypeScript (React).
• Strong PostgreSQL and ORM knowledge.
• Experience leading teams and balancing coding with mentorship.

Responsibilities

• Architect and scale multi-tenant SaaS backends and frontends.
• Define API design and integrate with Shopify, Mendrix.
• Lead code quality, testing (TDD/BDD), and CI/CD practices.
• Mentor developers and drive engineering excellence.

Skills

Leadership

Team mentorship

System architecture

Code quality

Tools

Django

React

PostgreSQL

Git / CI/CD (Bitbucket Pipelines)

Pytest

React Testing Library

JWT Auth

Shopify integration

Job description

Over 2 million food & beverage (F&B) businesses operate in the EU.

60% face failure within their first year

80% in five years.

SOUS is here to change that.

We’re building a platform that empowers independent F&B creators to thrive - unlocking new revenue streams, cutting costs, and scaling online growth with ease. From e-commerce to delivery management to building loyal communities, we’re reimagining how independent F&B brands grow in a digital‑first world.

In just two years, we’ve scaled rapidly, onboarded top talent, and brought in over €8M in sales for our clients. Now, we’re evolving - transitioning to a SaaS‑first model that will shape the future of the €100B independent F&B market.

To make this vision a reality, we’re searching for a Senior Full‑Stack Product Engineer who’s as excited about building great products as they are about leading a team. If you’re ready to roll up your sleeves, write brilliant code, and influence the technical direction of a high‑growth startup, we’d love to meet you.

Tasks

Code, Build, and Ship (70%-80% of your time):

• Develop and refine our core backend (Django) and frontend (React + TypeScript).
• Create and improve APIs for users, orders, shipping, and partner tools.
• Build smart integrations with tools like Shopify and Mendrix.
• Scale and optimize cloud hosting on GCP (and AWS in the future).
• Ensure our stack is clean, scalable, and future‑proof.

Product Engineering (20%-30% of your time):

• Architect and scale multi‑tenant SaaS solutions for the next phase of SOUS.
• Collaborate with product, design, and operations teams to align technical plans with business goals.
• Set the bar for code quality, testing (TDD/BDD), and CI/CD workflows.
• Mentor developers to help them grow while creating a culture of engineering excellence.
• Identify opportunities to innovate and improve.

Requirements

Hands‑On Experience:

• You’ve been in the trenches as a full‑stack developer for 10+ years, and you’re fluent in Python (Django) and JavaScript/TypeScript (React).
• You’ve built and scaled SaaS applications that are battle‑tested in production.
• Your database game is strong – PostgreSQL and ORMs are second nature to you.

Leadership in Action:

• You’ve led teams, balancing writing code with mentoring and decision‑making.
• You can architect systems that are both elegant and robust while keeping your hands dirty in the codebase.

Smart Development Practices:

• Testing isn’t just a buzzword for you - it’s how you build (Pytest, React Testing Library).
• You’re fluent in Git workflows and CI/CD tools (e.g., Bitbucket Pipelines).

API experience:

• Deep experience in building and integrating APIs—whether it’s RESTful APIs, JWT Auth, or third‑party tools like Shopify and Mendrix.

Frontend Know‑How:

• Modern frameworks (React, MUI) are where you shine.
• You know how to make frontends fast, responsive, and delightful.

Bonus Points For:

• Experience with Firebase (Auth, Hosting) or Google Analytics.
• Building SaaS platforms and multi‑tenant architectures.
• A background in e‑commerce, marketplaces, or scaling startups.

Benefits

Why SOUS?

• Competitive Salary + Equity: €95k + options—you’ll grow with us.
• Shape the Future: Your contributions will define what SOUS becomes.
• Flexibility: While we’re primarily on‑site, we value flexibility when it makes sense.
• Passion‑Driven Team: Join a group of foodies and techies who love solving big problems.
• High Impact: Be part of a mission that’s changing the way F&B creators succeed.

What to Expect in the Hiring Process:

1. A 30‑minute intro call to get to know each other.
2. A 60‑minute technical deep dive.
3. An technical assessment at our offices in Amsterdam.
4. A 30‑minute cultural alignment chat to see if we’re a match.

Ready to make an impact? Let’s build something incredible together.