Senior Backend Engineer

💰 $200,000 USD + Equity & Benefits

TestBox was founded with a bold mission: to fundamentally transform how software is bought and sold.

Today, most enterprise software is still sold through static demos and slide decks. TestBox replaces that with real, interactive product experiences powered by synthetic data, intelligent orchestration, and our proprietary product graph. Instead of imagining how software might work, buyers can actually test it in realistic environments before they buy.

We’ve raised $27M in funding to date, with Airtree leading our Series A and participation from Skip Capital, Glitch Capital, K8, and SignalFire. This funding allows us to accelerate our vision of building the infrastructure that powers modern software transactions.

To share more about the vision for TestBox and the product direction ahead, our CEO recently announced the Series A and several new product developments.

Watch the announcement here. 

At TestBox, we’re not just improving demos. We’re creating the next generation platform for how software is evaluated, purchased, and implemented, enabling teams to move from first interaction to successful onboarding faster and with greater trust.

We’re a fast-growing startup built by a team that values experimentation, velocity, and customer impact, and we’re just getting started.

We are hiring a Senior Backend Engineer to help design and build the core of our next-generation platform. This is an opportunity to be a key engineer responsible for creating the central nervous system that will power every product experience at TestBox for years to come.

You will be responsible for building a resilient, scalable, and asynchronous platform from the ground up. The core challenge is to build the backend platform that powers the intelligent automation of complex software environments, tackling problems of scale, resilience, and asynchronous task management. You won't just be implementing specs; you will be a critical voice in the platform's technical direction, making key decisions about technology, scalability, and design patterns.

This role is ideal for a systems thinker who excels at solving complex distributed systems problems and is motivated by the opportunity to build a platform with massive leverage. This is a greenfield opportunity to write the first lines of code for services that will define our business.

• Design and build the core backend services that enable complex, long-running, and asynchronous operations across multiple systems.
• Create the foundational frameworks and libraries that will be used by the rest of the engineering team to build new product capabilities.
• Design and implement the suite of robust backend services that form the foundation of our new platform, ensuring they are resilient and scalable.
• Partner with leadership to drive key technology and design decisions, and to establish backend engineering best practices.
• Help foster a culture of high-quality code, great design, and a commitment to building for the long term.

• You are a systems thinker, who defaults to designing for resilience, scalability, and observability.
• You are pragmatic and product-aware, able to balance building elegant systems with the iterative needs of a fast-moving startup.
• You are passionate about developer experience and find fulfillment in building tools and frameworks that make other engineers more productive.
• You have a high sense of ownership and are motivated by the accountability that comes with building business-critical systems.
• You communicate technical concepts clearly and are skilled at collaborating with product, design, and other engineers to solve complex problems.

• 5+ years of experience in backend software engineering, including building, deploying, and operating complex distributed systems.
• Deep expertise in a modern backend language (e.g., Python, Go, Ruby etc.).
• Strong experience with event-driven design, message queues, and asynchronous communication patterns.
• Hands-on experience with modern cloud infrastructure (e.g., AWS, GCP) and containerization technologies.
• Experience designing data models and working with a variety of database technologies to fit different needs.
• A strong understanding of API design principles and best practices.
• Bonus: Direct experience with workflow/orchestration engines.
• Bonus: Experience building developer tools, SDKs, or public-facing APIs.

• Build foundational, greenfield systems from the ground up and make a massive impact from day one.
• Solve challenging and rewarding distributed systems problems.
• Shape the technical foundation that will power the company's growth for the next decade.
• Join a company obsessed with customer experience, speed, and scale.

• Generous equity package for meaningful ownership.
• Prioritization of your professional growth, with dedicated career development support.
• Flexible, unlimited PTO with a minimum expectation for recharge.
• Mental Health benefits.
• Fitness allowances.
• Learning allowances.
• Remote and office setup allowances to ensure productive and comfortable working environments.