Senior Full Stack Software Engineer

About Us Join us in building the leading AI-Powered Mission Control for Corporate Travel. Some of the world's most recognizable companies, representing over $4T in market value, rely on Clarasight's software to reduce risks, save costs, protect revenues, and manage emissions aligned with business objectives and sustainability goals. About You You are a builder at heart — curious, pragmatic, and motivated to solve hard technical problems that matter. You thrive in early-stage startup environments where speed, ownership, and adaptability are critical. You don’t just go along for the ride — you act as a driver, not a passenger, taking initiative and shaping outcomes rather than waiting for direction. You love working across the stack, from designing intuitive user experiences to architecting robust backend systems, and you’re quick to learn new technologies when the problem demands it. You’re passionate about leveraging software and data to create meaningful impact, and you see the opportunity to contribute directly to decarbonization and enterprise transformation. You approach challenges with creativity, rigor, and a growth mindset, and you want to be part of a small team where your contributions have outsized influence. About the Role We are seeking a Senior Software Engineer to join our founding team. As one of our first engineering hires, you’ll help shape both our product and our engineering culture. This is a true full-stack role where you’ll build core product features, contribute to data infrastructure, and take ownership of systems from design through deployment. You’ll collaborate closely with product and design, experiment rapidly, and help define best practices that will scale with us. With 2–3 days per week in our Boston office, you’ll be at the center of key technical and strategic decisions as we scale. Key Responsibilities Full-Stack Development

• Design, build, and deploy end-to-end features across frontend, backend, and infrastructure.
• Ensure code quality, scalability, and maintainability while balancing speed of delivery.

Data Engineering & Systems Design

• Contribute to building robust data pipelines and integrations that power financial and emissions insights.
• Collaborate on data modeling, ETL, and analytics foundations to support customer needs.

Startup Agility

• Wear multiple hats and move quickly to meet customer and product demands.

Make pragmatic technical decisions while keeping long-term scalability in mind.

Cross-Functional Collaboration

• Work closely with Product and Design to deliver features that solve real customer problems.

Partner with business teams to understand enterprise requirements and translate them into technical solutions.

You’ll Be a Great Fit If You…

• Have 3 years of professional software engineering experience.
• Bring full-stack experience (e.g., React/TypeScript, Node.js, Python, or similar).
• Have startup or early-stage experience and thrive in fast-paced, ambiguous environments.
• Are excited about automating data engineering processes and already have experience with pipelines, ETL, and analytics systems.
• Are quick to learn new technologies and approaches.
• Are based in the Boston area and available for 2–3 in-office days per week.

Nice to Haves

• Experience with dbt, DuckDB, or the modern data stack.
• Familiarity with cloud platforms, DevOps, or infrastructure as code.
• Background in sustainability, carbon accounting, or financial systems.

Diverse Perspectives We know that innovation thrives on teams where diverse points of view come together to solve hard problems in ways that are just now possible. As such, we explicitly seek people that bring diverse life experiences, diverse educational backgrounds, diverse cultures, and diverse work experiences. Please be prepared to share with us how your perspective will bring something unique and valuable to our team.