Senior Software Engineer - Tallinn

About Zerofy · At Zerofy, we are building the AI and cloud platform powering the electrified home. · Our system integrates solar, batteries, EV chargers, heat pumps, and dynamic tariffs into a single intelligent optimization layer. Using our own forecasting and control algorithms ...

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About Zerofy

At Zerofy, we are building the AI and cloud platform powering the electrified home.

Our system integrates solar, batteries, EV chargers, heat pumps, and dynamic tariffs into a single intelligent optimization layer. Using our own forecasting and control algorithms—developed together with research partners and universities—our platform autonomously optimizes household energy usage to reduce household energy cost and helps to stabilize the grid.

We operate a pure cloud architecture serving solar installers and some of Europe's largest energy companies through our B2B platform.

Our mission is to become the intelligence layer for residential energy.

The Role

We are looking for a Senior Software Engineer who cares deeply about engineering craftsmanship, enjoys solving complex technical problems, and wants to build systems at the frontier of cloud, AI, and energy.

You will design and build core parts of our platform, working across backend services, cloud infrastructure, device integrations, and AI-driven systems.

This role comes with a high degree of ownership and autonomy. You will own systems end-to-end, influence architecture, and help shape the technical direction of the company.

You will also mentor junior engineers and contribute to building a strong engineering culture.

Our Tech Stack

Our backend is built primarily in TypeScript running on , using a cloud-native, serverless architecture on Google Cloud Platform. We use services such as Cloud Functions, Pub/Sub, Firestore, and BigQuery to build scalable, event-driven distributed systems. Our platform integrates with a wide range of external APIs and IoT devices, including solar inverters, batteries, EVs, and heat pumps.

A core part of our platform includes proprietary forecasting, optimization, and control algorithms developed in collaboration with research partners and universities.

We also use modern AI coding tools extensively, including Claude, Cursor, Conductor, and similar frontier tools. We expect engineers to actively leverage AI-assisted development to increase velocity and capability.

What You'll Do

• Design and implement core backend systems using TypeScript and

• Architect and build scalable, reliable cloud-native services

• Own technical components end-to-end, from design to production

• Build distributed, event-driven systems running on Google Cloud

• Integrate external APIs from energy devices, EVs, and IoT systems

• Work closely with our AI and algorithm systems powering optimization and forecasting

• Make architectural decisions and improve system design, reliability, and performance

• Mentor junior engineers and help raise the engineering bar of the team

• Use modern AI coding tools extensively to accelerate development

• Contribute to a culture of engineering craftsmanship and continuous improvement

What We Offer

• High degree of ownership and autonomy

• Opportunity to shape the architecture and core systems

• Work on meaningful problems with real-world climate impact

• Small, highly capable, senior team

• Extensive use of frontier AI tools in engineering workflows

• Competitive salary and equity participation

• Flexible remote / hybrid setup

• Office in Tallinn, Estonia

• 5 weeks vacation

• Coworking support

Why Join Zerofy

• You'll work on one of the most important technical challenges of the coming decades: building the intelligence layer for electrified energy systems.

• This is an opportunity to build complex, meaningful systems with real-world impact, in an environment that values engineering excellence, ownership, and innovation.

What We're Looking For

Required

• 5+ years of professional software engineering experience

• Strong expertise in backend engineering using TypeScript and

• Experience building cloud-native distributed systems

• Strong engineering craftsmanship and attention to quality

• Experience owning complex systems or components end-to-end

• Ability to design systems and architecture, not just implement tasks

• Experience mentoring engineers and contributing to a strong engineering culture

• Ability to operate with a high degree of ownership and autonomy

• Strong interest in modern engineering tools, including AI-assisted coding
  

Highly valued

• Experience with Google Cloud Platform, AWS, or similar

• Experience with serverless architectures and event-driven systems

• Experience integrating external APIs or hardware/IoT systems

• Experience working on applied AI, data systems, or optimization systems

• Experience using modern AI coding tools such as Claude, Cursor, or similar

Ideal Candidate

The ideal candidate:

• Is a strong engineering craftsperson

• Takes pride in building high-quality, reliable systems

• Enjoys working on complex technical problems

• Has strong ownership mentality and operates autonomously

• Stays at the forefront of technology and modern engineering practices

• Is curious, pragmatic, and execution-focused

• Bonus points if you:

• Own or are interested in solar, batteries, EVs, or heat pumps

• Are interested in energy systems, electrification, or climate tech