Software Engineer, Full Stack - Founding Team

As an early member of the team, you’ll work closely with everyone to shape the engineering and company culture, with significant opportunity to grow as we scale.

We use TypeScript, NextJS, NodeJS, Postgres, and the major inference providers.

What You’ll Do 💪

• Work directly with the founders, customers, and users to rapidly prototype, test, and ship features
• Design and ship AI-driven features like agentic web browsing, retrieval-augmented generation (RAG), and large-scale data extraction.
• Extend our core APIs, AI infrastructure, and data pipelines to enable highly requested application features.
• Own features end-to-end: from idea → design → implementation → production → user feedback

Qualifications 🧠

• 3+ years of professional software engineering experience
• Experience building full-stack software applications: You’ve built some web frontend (we use Typescript, React, and NextJS), as well as backing APIs and a data model layer (we use NestJS and Postgres). Exact technology match is great but not required, and even if your experience is stronger in frontend or backend, you’re excited to learn and contribute across the board
• Willingness to learn new domains: usage of AI tools, techniques, and APIs; how solar and storage project development work
• Bonus: Experience designing and building large, data-intensive systems
• Bonus: Experience using LLMs programmatically, building AI agents, and/or using RAG
• Bonus: Have worked at a startup or in energy

You’re a great fit if… ✅

• You love writing code, but also care about having a big impact. You’re excited to talk to customers, not just hide in code. You’re excited about shaping what to build.
• You know when to hack and when to refactor. Being an early engineer means making best judgment tradeoffs between building a really well-designed system and “good enough” for the situation.
• You want to operate like an owner and see how startups are built from the ground up. If there’s anything about business or tech you’re interested in, there will be opportunities to learn and do it.
• You’re curious about how clean energy and infrastructure get built, even if you’re new to the space.

You’re NOT a great fit if… ❌

• You want to ship perfect code. Speed as a startup is one of our main advantages. We don’t have the luxury to spend time on perfection and always try to do more with less.
• You don’t want involvement in the business side of things. Our technical decisions and business strategy go hand in hand - understanding how they influence each other helps us build the right things.

Compensation and Benefits 💰

• $150–200k
• Meaningful equity
• Health coverage and other startup perks
• Visa sponsorship for qualified candidates
• Sunny office in SOMA by Montgomery BART station

Our Company Values 💛

1. Act with Urgency: Move with decisiveness and momentum—do the right things now.
2. Extreme Ownership: We take responsibility, fix problems, and own outcomes.
3. Seek Truth: We practice intellectual rigor, challenge assumptions, and engage in honest debate and feedback, with respect for all voices.
4. Lead with Energy: We approach work with curiosity, execute with intensity, and build warm, trusting relationships with teammates and customers.
5. Build for the Mission: Spark is building the AI workflow engine that scales energy infrastructure to unlock an abundant and sustainable future

A meeting lands on your calendar

If they’re a yes, I book the chat. You show up — that’s the whole job-hunt.