Backend Developer (f/m/x) Data & Database

Stellenbeschreibung:

Backend Developer (f/m/x) Data & Database

Join to apply for the Backend Developer (f/m/x) Data & Database role at suena energy

Hamburg Hybrid (2–3 days/week onsite) | 30 Days Vacation | English B2
Are you enthusiastic about intelligent and effective software solutions to the energy transition?

Join us at suena energy as Senior Backend Engineer (f/m/x) and become a core member of our new platform team. Shape and scale our data infrastructure for the next generation of energy trading—enabling seamless analytics, high-performance databases, and integrations for the future of clean energy.

suena energy is a green tech startup specializing in algorithmic energy trading for energy storage systems and renewables.

Our vision: a world where clean energy is used reliably, economically, and intelligently. Our AI-powered software maximizes the revenues of large-scale energy storage and renewable assets on European short-term power markets—while minimizing risk.

We're a team of 38 people, combining a warm, supportive team culture with true startup drive. Following our successful Series A, we’re now building a dedicated platform integration team from scratch—relieving our modeling and data science teams from operational bottlenecks. As one of the first Senior Engineers (f/m/x), you'll have real ownership, direct impact, and the chance to shape our technical standards and team culture.

Quick Check: Is this your next Engineering Playground?

Tech Stack: Python (Django/FastAPI), SQL & NoSQL (PostgreSQL, TimescaleDB, DynamoDB, Redis), data lakes/warehouses, Celery, Docker, AWS, GitLab CI/CD, Sentry, Grafana
Your Focus: Data modelling, database architecture, time-series data, ETL pipelines, performance, scalability, data integration improvements, automations, legacy improvements
Team: Newly formed platform squad with two Senior Engineers (one API, one Data/DB), one Junior Engineer, and a Modelling expert transitioning from the Modelling team, direct CTO access, collaborative culture, async-friendly, regular pair programming
Product: Advanced energy trading & optimization platform, real-time APIs, heavy data flows, ML integrations, high complexity
Who thrives here: Senior backend engineers with broad experience in SQL & NoSQL, data management tools, and scalable data architectures - ready to drive innovation
Must-haves: 5+ years backend, hands-on with SQL & NoSQL databases, experience with data management tools (data lakes/warehouses), ETL/data pipelines, performance tuning for large datasets, cloud deployment
Dealbreakers: No cloud/database experience, no broader data stack, no coding experience, desire to work fully solo

Aufgaben

Design, optimize, and maintain high-performance databases, data pipelines, and APIs for suena's energy trading and analytics platform.
Model complex time-series data, enable robust integrations with modelling and data science teams, and ensure data reliability and scalability.
Drive automations to streamline data flows and system processes across the platform.
Build solutions for both greenfield and legacy systems - refactor, tune, and scale our backend to support new market and trading initiatives.
Collaborate closely with backend, modelling, and product teams to deliver seamless data flows and high-quality analytics in production.
Focus on data integrity, security, and system availability as the platform grows.

Profil

5+ years' experience in backend development, deep expertise in SQL & NoSQL databases (e.g. PostgreSQL, TimescaleDB, DynamoDB, MongoDB), and complex, data-driven systems (e.g. energy, finance, IoT, trading).
Proven experience designing and scaling databases, optimizing performance, and building reliable ETL/data pipelines in cloud environments (AWS preferred).
Hands-on with Python (Django/FastAPI), DevOps, CI/CD, Docker, async workflows (Celery, Redis), and modern testing/monitoring setups.
Security-first and data-driven mindset, comfortable with both greenfield engineering and legacy code/data refactoring.
Excellent communication skills in English (B2/C1); able to collaborate across technical and non-technical teams.
Dealbreakers: No cloud/database experience, no production backend ownership, no appetite for complex data challenges.

Wir bieten

Shape the Future: Help drive the energy transition with us! Join a booming market, real startup spirit, and make your mark in sustainability.
Connecting & Co-Creating: Strategy off-sites (like Denmark 2024) and onsite weeks for real collaboration and shared ideas.
Work Your Way: Home office and flexible hours – you know what works best for you and your team.
Team Spirit: Yoga, shared lunches, after-work fun – we support each other and keep the vibe strong, even when it's busy. Barista, DJ, guitarist included – we can't wait to discover your hidden talent!
Fair & Transparent: Clear structures, democratic decisions, and a feedback culture where your voice counts.
Body & Mind: Urban Sports Club membership, wellbeing check-ins, and mental health support – your energy matters.
New Office Vibes: 10th-floor office with rooftop terrace, canteen, great views, ergonomic desks, hardware of your choice, and pet-friendly!
Sustainable Extras: Deutschlandticket, FutureBens, and more – supporting your mobility and future.

Important note

Please be advised that a valid work permit for Germany is required for non-EU citizens. Unfortunately, applications without a valid work permit and sufficient German language skills may not be considered.

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