Lead 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 founding member of our new platform team. Shape complex backend systems and APIs that integrate data, analytics, and optimization for real-time energy trading. Help us scale our infrastructure and enable the next generation of clean energy solutions.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, 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), PostgreSQL/TimescaleDB, Redis, Celery, Docker, AWS, GitLab CI/CD, Sentry, GrafanaYour Focus: Scalable API and backend architecture, event-driven systems, new feature development, legacy API improvements, secure user managementTeam: Newly formed platform squad with two Senior Engineers, one Junior Engineer, and one 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, data-driven, ML-integrated, high complexityWho thrives here: Senior backend engineers with leadership ambition, cloud & API experience, and a love for robust, scalable systemsMust-haves: 5+ years backend experience, cloud deployment, API authentication & authorization, zero-downtime deploys, experience with user management systems, security mindsetDealbreakers: No cloud/API/auth experience, mainly CRUD web app background, desire to work fully soloYour missionLead the design, development, and evolution of suena’s backend and API infrastructure—ensuring scalability, performance, and reliability as our platform grows.Build, optimize, and maintain robust APIs and API-driven data integrations that connect real-time trading, analytics, and forecasting engines.Drive automations to streamline data flows and system processes across the platform.Mentor and support a growing engineering team, setting technical standards and driving best practices in architecture, testing, and deployment.Collaborate closely with data science, modelling, and product teams to bring complex analytics and optimization into production.Balance new feature delivery and legacy system improvements, always with a focus on security, data integrity, and high availability.Design, implement, and continuously improve secure user management systems, including authentication, authorization, and role-based access controls.Your profile5+ years’ experience in backend development, ideally with Python/Django or FastAPI, and complex, data-driven systems (e.g. energy, finance, IoT, trading).Confident designing and scaling APIs, databases (PostgreSQL/TimescaleDB), and distributed/cloud-based architectures (AWS preferred).Proven track record leading teams or projects; strong mentoring, code review, and technical direction skills.Hands-on with DevOps, CI/CD, Docker, async workflows (Celery, Redis), and modern testing/monitoring setups.Security-first mindset: experience implementing authentication, authorization, and reliable, zero-downtime deployments.Pragmatic, collaborative, and proactive - comfortable with both greenfield engineering and legacy code refactoring.Excellent communication skills in English (B2/C1); able to translate technical challenges for cross-functional teams.Dealbreakers: No cloud/API/auth experience, no production backend ownership, no appetite for technical leadership.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">