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Senior Backend EngineerTestBox • United States
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Senior Backend Engineer

TestBox
  • US
    United States
  • US
    United States
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Über

Important Note: This role requires in-office presence at our San Francisco office at least 4 days a week. About us 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. Who we are looking for We’re hiring a Senior Backend Engineer to help build and evolve the platform that powers TestBox. While our core product is already live and delivering value to customers, we’re now building
Monarch , our next-generation agentic platform that will orchestrate and automate complex software environments. This is not a maintenance role. You’ll be working on
new systems, new architecture, and new platform capabilities , helping us transition from early product to a fully scalable, intelligent platform. You have 5+ years of experience in backend software engineering, including building, deploying, and operating complex distributed systems. Expertise with modern, backend languages incl Go, Python, Rust, Node (TypeScript). Strong experience with event-driven design, message queues, and asynchronous communication patterns. Hands-on experience with modern cloud infrastructure (e.g., AWS, GCP) 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. You will Design and build backend systems that power the product and agentic workflows Evolve and re-architect core services for scalability and performance Build frameworks and infrastructure used across the platform Work on distributed, asynchronous systems operating at scale Partner with leadership on long-term platform and architectural decisions What success looks like In the first 90 days, you will ramp quickly on the existing product and architecture, building a strong understanding of how the platform operates in production while starting to contribute to Monarch. You’ll design and ship new backend services and agentic workflows, identify opportunities to improve scalability and system design, and deliver meaningful improvements or new capabilities on a weekly basis. By the end of this period, you’ll be fully embedded in the Platform team and trusted to take ownership of key backend services. By 12 months, you will have played a key role in building and shaping our product. You’ll own critical backend systems that enable scalable, autonomous behaviour, while driving improvements in performance, reliability and architecture across the platform. Your work will directly support live customer environments and contribute to measurable business impact. You’ll be seen as a go-to engineer for technical decision-making, someone who raises the bar for system design and code quality, and a teammate others genuinely enjoy working with. The benefits Unlimited access to AI tools Unlimited token budget 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. We believe that diversity is critical to our success. We will not discriminate on the basis of race, religion, national origin, gender identity or expression, sexual orientation, age, or marital, veteran, or disability status.
  • United States

Sprachkenntnisse

  • English
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