Software Engineer – Backend (SaaS & Infrastructure)

Location: Remote (Central/Eastern US Timezone or GMT/GMT+1)

Employment Type: Full-Time

Reports To: VP of Engineering

About Us

Flox is an innovative Series A startup building developer tools for engineering teams. We're focused on simplifying complex workflows, improving developer productivity, and empowering teams to deliver high-quality software faster. At Flox, we value technical excellence, collaboration, and iterative improvement, and we're looking for a Software Engineer – Backend to help us build and scale our core platform.

About the Role

We are looking for a backend-focused software engineer to help design, build, and maintain the core services that power our SaaS offering. You will work on APIs, multi-tenant storage, role-based access control, authentication and authorization, payment systems, and database schema design and tuning. You will be responsible for ensuring our backend services are secure, scalable, and efficient, supporting both our internal teams and customers.

This role is ideal for an engineer who thrives in a startup environment, understands the challenges of scaling SaaS platforms, and enjoys building robust and well-architected systems. You’ll work closely with product, design, and other engineers to deliver high-quality backend services that drive our product forward.

Responsibilities
• Design, implement, and maintain scalable backend services that power our SaaS platform.
• Develop and optimize APIs for internal and external use.
• Work on authentication & authorization systems, including role-based access control (RBAC) and multi-tenancy models.
• Build and integrate payment processing systems for subscriptions and billing and back office needs.
• Design and optimize database schemas for performance and maintainability.
• Ensure backend services meet security, compliance, and SOC2 requirements.
• Implement observability, monitoring, and incident response processes to ensure system reliability.
• Collaborate closely with frontend engineers, product managers, and designers to deliver seamless user experiences.
• Participate in code reviews, architecture discussions, and technical roadmap planning.
• Perform incident response and support (includes on-call rotation)

Qualifications

Technical Expertise:
• 5+ years of experience in backend software development for a SaaS or Enterprise administration console.
• Strong proficiency in Go, Rust, Python, or a similar backend language.
• Experience with RESTful APIs and/or gRPC.
• Expertise in authentication and authorization protocols (OAuth, OpenID Connect, JWT).
• Experience designing and implementing RBAC and multi-tenant architectures.
• Strong understanding of SQL and database optimization (PostgreSQL, MySQL, or similar).
• Familiarity with payment processing systems (Stripe, Braintree, or similar).
• Knowledge of observability tools (Prometheus, OpenTelemetry, etc.).

Nice-to-Have:
• Experience with SOC2 compliance, security best practices, and infrastructure hardening.
• Familiarity with Nix, Rust, or Node.js.
• Knowledge of event-driven architectures (Kafka, NATS, or RabbitMQ).
• A willingness to Karaoke

Success Measures

In 30 days, you will have:

Familiarized yourself with our backend architecture, APIs, and services.

Made contributions to the core backend systems, including bug fixes and minor features.

Understood the multi-tenant and RBAC models used in our platform.

In +0 days, you will have:

Designed and implemented a new backend feature or service, from concept to deployment.

Improved an existing system's performance, scalability, or reliability.

Contributed to security and compliance efforts, including SOC2-related work.

Participated in architecture discussions and provided input on technical decisions.

What We Offer
• Competitive salary and meaningful equity in an early-stage startup.
• Flexible, remote-friendly work environment.
• Opportunities for career growth in a high-impact role.
• The chance to shape the technical culture and architecture of a rapidly growing SaaS product.

Travel: It is encouraged to travel about 2 weeks a year to collaborate with the team in person.

How to Apply

To apply, please submit your resume and a brief cover letter explaining why you’re excited about joining Flox as a Software Engineer – Backend.