Backend Developer Data & Database

• 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., * 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.

Are you enthusiastic about intelligent and effective software solutions to the energy transition?, * 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, * 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 sind ein 30-köpfiges Team, das eine herzliche, unterstützende Teamkultur mit Startup-Drive verbindet. 2025 holen wir gezielt neue Talente an Bord - und freuen uns, wenn du dazugehörst.

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.