Senior Backend Engineer – Cloud Infrastructure

Capalo Ai; Finland; Hybrid; EUR 90,000 - 130,000; Full time

Job summary

Capalo AI Oy is building the cloud platform behind Europe’s grid-scale batteries. We seek a Senior Backend Engineer to own backend architecture for Capalo Zeus VPP, interfacing with battery assets and market operators across Europe.

You will design scalable services, implement APIs, and drive production reliability in a hybrid Helsinki/Kuusamo environment. You’ll work on cloud-native AWS infrastructure, event-driven processing, and robust data pipelines to forecast, optimize, bid, and dispatch

Qualifications

• Significant experience building production backend systems where reliability and correctness matter.
• Strong hands-on Python and modern backend engineering, including APIs and asynchronous processing.
• Experience designing production systems, including service boundaries, APIs, failure handling, and ownership.
• Production experience with AWS or another major cloud platform.
• Comfort working across backend engineering, infrastructure, data, and domain logic in ambiguous environments.

Responsibilities

• Design and build backend services for asset monitoring, schedule generation, command delivery, and battery dispatch.
• Develop integrations with asset-side systems and market interfaces using REST APIs, MQTT, and IEC-104.
• Build cloud-native infrastructure on AWS, including event-driven services, storage layers, deployment tooling, and operational foundations.
• Develop the backend foundations that support forecasting and optimization pipelines with data quality, traceability, and safe production deployment.
• Improve observability, failure handling, incident response, and reliability of 24/7 production services.
• Contribute to architecture reviews, Infrastructure as Code (Terraform), CI/CD, and mentoring other engineers.

Skills

Python

APIs

Asynchronous processing

Event-driven architectures

AWS

Tools

Terraform

MQTT

IEC-104

Job description

Location: Helsinki, Finland (Hybrid) · Kuopio or remote within Finland · Relocation support available

Build the cloud platform behind Europe's grid-scale batteries

We're looking for a Senior Backend Engineer to help build the cloud infrastructure behind Capalo Zeus VPP™ - our virtual power plant that forecasts, optimizes, bids, dispatches, and operates grid-scale battery storage across European electricity markets.

This is not an internal business application. Our software continuously interacts with real battery assets and market operators, making production reliability, correctness, and operational excellence central engineering challenges.

This is a senior role with end-to-end technical ownership. You'll design backend systems, shape architecture, make production-critical technical decisions, and help evolve the platform as we expand into new markets and new types of energy assets.

About Capalo AI

Capalo AI develops software that turns grid-scale batteries and hybrid renewable parks into actively traded energy assets through Capalo Zeus VPP™—our fully managed virtual power plant for forecasting, optimization, trading, dispatch, and operational control.

Zeus VPP operates continuously across European electricity markets, integrating with wholesale, balancing, and ancillary service markets while coordinating state-of-charge-aware dispatch across battery portfolios.

What you'll work on

• Design and build backend services for asset monitoring, schedule generation, command delivery, and battery dispatch

• Develop integrations with asset-side systems and market interfaces using REST APIs, MQTT, and IEC-104

• Build cloud-native infrastructure on AWS, including event-driven services, storage layers, deployment tooling, and operational foundations

• Develop the backend foundations that support forecasting and optimization pipelines, with a focus on data quality, traceability, replayability, and safe production deployment

• Improve observability, failure handling, incident response, and the reliability of business-critical services operating 24/7

• Contribute to engineering standards through architecture reviews, Infrastructure as Code (Terraform), CI/CD, and mentoring other engineers

What we're looking for

Required

• Significant experience building and operating production backend systems where reliability, maintainability, and correctness matter

• Strong hands-on Python and modern backend engineering, including APIs, asynchronous processing, and event-driven architectures

• Experience designing production systems, including service boundaries, APIs, failure handling, and operational ownership

• Production experience with AWS or another major cloud platform

• Comfort working across backend engineering, infrastructure, data, and domain logic in technically ambiguous environments

Nice to have

• Infrastructure as Code (Terraform or equivalent)

• Experience integrating with external APIs, industrial protocols, or machine-to-machine systems (MQTT, IEC-104, SCADA, or PPC experience is a plus)

• Background in time-series systems, scheduling, control systems, or other operational software

• Experience with energy markets, trading platforms, grid services, or optimization-driven production systems

Why Capalo AI

• Production systems with real-world impact. Your software directly supports how grid-scale batteries participate in European electricity markets.

• Interesting engineering challenges. Build distributed systems, event-driven cloud services, industrial integrations, and reliable software for continuously operating infrastructure.

• Meaningful ownership. Engineers own systems from design through production and have significant influence on architecture and technical direction.

• A growing domain. Battery storage is becoming critical infrastructure for the energy transition, and we're building the software that enables it.

What to Expect

• Location: Helsinki, Finland

• Working mode: Hybrid - 3 days per week in the office

• Recruitment process: Screening call → Take-home assignment → Technical interview → Bar raiser interview

We review applications on a rolling basis and welcome candidates from diverse backgrounds.