Senior Backend Engineer

IntroHamburg Hybrid (2–3 days/week onsite) | 30 Days Vacation | English B2Are 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, GrafanaYour Focus: Data modelling, database architecture, time-series data, ETL pipelines, performance, scalability, data integration improvements, automations, legacy improvementsTeam: 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 programmingProduct: Advanced energy trading & optimization platform, real-time APIs, heavy data flows, ML integrations, high complexityWho thrives here: Senior backend engineers with broad experience in SQL & NoSQL, data management tools, and scalable data architectures - ready to drive innovationMust-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 deploymentDealbreakers: No cloud/database experience, no broader data stack, no coding experience, desire to work fully soloYour missionDesign, 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.Your profile5+ 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.Why us?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 talentFair & 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-friendlySustainable Extras: Deutschlandticket, FutureBens, and more – supporting your mobility and future.What else?We look forward to receiving your application, earliest start is as soon as possible. If you have any questions, feel free to reach out - your contact is Kathi (Interim Talent Partner).You’ll hear back from us within 5 working days of your application. We value your time and want to make the process as transparent as possible. Once we receive your application, we’ll send you a confirmation email outlining the next steps and what you can expect from our interview process.We can’t wait to meet yousuena energy is an equal opportunity employer. We celebrate diversity and reject any form of discrimination. It is important to us to create an inclusive environment for all our team members. We want to particularly emphasize that our call for applicants is addressed to all genders. The integration of people with disabilities is an opportunity and not a problem for us, and we, therefore, welcome their application.About ushttps://www.youtube.com/watch?v=-Dsctj9qh2shttps://www.youtube.com/watch?v=-Dsctj9qh2s" title="YouTube video player" frameborder="0" ="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin">