Backend Software Developer (Energy, Time Series & Data Flows)

Startup Atlas; Antwerpen; Hybrid; EUR 70,000 - 100,000; Full time

Benefits offered by this job

Competitive gross base salary

Performance bonus up to €25K/year

Stock options

13th month salary + double vacationpay

Company car or mobility budget

EV charging card

Hospital insurance for you

Laptop + smartphone

Hybrid offices in Brussels and Antwerp

Job summary

Enersee in Belgium is hiring a Backend Software Developer focused on energy, time series data, and data flows. You will build scalable services, ensure reliable data movement from ingestion to API exposure, and collaborate across teams in a hybrid setup with offices in Antwerp and Brussels.

Requires strong Python backend experience (FastAPI, SQLAlchemy) and a practical mindset for production-grade engineering, testing, and data-flow design. Energy/IoT exposure is a plus.

Qualifications

• Production backend experience with Python and web frameworks.
• Strong Python and API design skills with testing and CI/CD habits.
• Experience designing and operating data flows or event-driven workflows.

Responsibilities

• Build backend services that run in production and expose reliable APIs.
• Develop scalable data flows and integrations for energy platform.
• Improve throughput, latency and observability of critical paths.
• Collaborate with data/AI teams to support model deployment and pipelines.

Skills

Backend development

Python

FastAPI

SQLAlchemy

CI/CD

Testing

Architecture

Reliability mindset

Data flows

Tools

Python ecosystem (FastAPI, SQLAlchemy)

AWS/GCP

Containers

CI/CD tooling

Job description

Enersee is an AI-powered platform that provides 24/7 virtual energy management, helping businesses reduce energy waste, lower carbon emissions, and conserve water through automated energy audits, anomaly detection, and real-time ROI tracking across building portfolios.

Backend Software Developer (Energy, Time Series & Data Flows)

Enersee is seeking a backend software developer to build scalable services, data flows, and integrations for their energy efficiency platform, focusing on production-grade engineering with Python and time series data handling. The role involves collaborating with teams to ensure reliable data movement from ingestion to API exposure in a hybrid work environment in Antwerp and Brussels, Belgium.

Job Description

Backend Software Developer (Energy, Time Series & Data Flows)

• Hybrid

We’re looking for a Backend Software developer who lives and breathes data. Someone who thrives at the intersection of engineering, customer collaboration, and real-world problem solving.

Enersee is scaling its platform and we’re looking for a backend software developer to build the services, integrations, and data flows that power our energy efficiency product. Your focus is production-grade backend engineering: designing systems that reliably move data from “source → validated → served,” and keep working under real-world conditions.

What you’ll do

Build backend services that run in production

• Design and implement scalable backend services (Python, APIs, internal services).
• Write clean, testable code and improve existing architecture where needed.

Build and evolve data flows (core)

• Ensure data correctness and traceability (versioning, lineage, retries, idempotency, backfills).
• Improve throughput and latency of critical flows; handle spikes and partial failures gracefully.
• Build tooling around flows: observability dashboards, failure handling, replay/backfill utilities.
• Build and maintain connectors for time series energy & water data and related metadata.
• Work with customers/partners to troubleshoot and stabilize integrations.

Collaborate with data/AI without being ML-first

• Collaborate with data/ML teammates so the backend supports model deployment and feature delivery.
• Turn product requirements into robust backend implementations (APIs, workflows, pipelines).

Job requirements

Must-have: strong backend development

• Solid experience building production backends in Python (FastAPI, SQLAlchemy, and similar)
• Strong software engineering fundamentals: architecture, testing, CI/CD habits, code reviews, performance, code ownership & reliability mindset.
• Experience designing and operating data flows (or event-driven workflows) in production.

Nice-to-have: time series + energy efficiency

• Hands-on experience with time series data (processing, validation, edge cases).
• Experience or strong affinity with energy efficiency / buildings / energy monitoring / utilities / IoT contexts.
• Experience with streaming or message-based systems (queues/events), or batch pipelines with backfills.
• Cloud experience (AWS/GCP), containers, infrastructure-as-code.
• Experience improving operational maturity: SLOs, alerting, runbooks, incident reviews.

Don’t check every box?

Smart people don’t always follow straight lines. If you believe in what we’re doing and think you can help us grow, we want to hear from you.

What we offer you in return

We want you to grow with us and benefit from the impact you make.

• Competitive gross base salary depending on your experience
• Performance bonus (up to €25K/year)
• Stock options—you grow, we grow
• 13th month salary + double vacation pay
• Company car (worth €35–50K) or mobility budget + extra salary
• Charging card for your EV (also usable privately)
• Hospital insurance for you (free) + discounts for family
• Laptop + smartphone, incl. €30/month for phone & internet
• Energetic offices in Brussels and Antwerp + hybrid work flexibility
• Fun events, team activities, and milestones worth celebrating

FYI - We are growing fast, which is asking for a little more face 2 face interaction to also move fast.

Our work setting is hybrid, and our tech team works from the office in Antwerp and Brussels. So yes, you can of course also take some days to focus from home, but we can’t have you working fully remote for now.