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

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).

• Own reliability: monitoring, logging, alerting, performance, debugging, incident follow-up.

• Write clean, testable code and improve existing architecture where needed.

Build and evolve data flows (core)

• Design and implement end-to-end data flows: ingestion → validation → AI analytics → exposure (API/product).

• 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.

Integrations + time series pipelines

• Build and maintain connectors for time series energy & water data and related metadata.

• Handle messy real-world inputs: missing intervals, time zones/DST, duplicates, late-arriving data, inconsistent schemas.

• 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).

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.

Compensation & Benefits

• 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

• Meal vouchers (€8/day) + Eco vouchers (€250/year)

• 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.

Want to help build the clean energy future through data, tech, and purpose?

Apply now and let’s talk.