Senior Backend Developer Python (m/f/d)

INTRO Hamburg Hybrid (2–3 days/week onsite) | €55.000 - 60.000 p.a. | 30 Days Vacation | English B2 Are you enthusiastic about intelligent and effective software solutions to the energy transition? Join us at suena energy as a Junior Backend Engineer (f/m/x) and become an essential part of our new platform team. You’ll work side-by-side with experienced engineers on both APIs and data-driven backend systems, gaining hands-on experience in everything from database design to real-time integrations for next-generation energy trading. This is your chance to learn, grow, and have a real impact in a friendly, ambitious, and sustainable tech environment. 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 50+ person team that's fast-paced by nature, but the kind of place where people actually look out for each other. Following our successful Series A, we're investing in expanding our team – and we're excited to strengthen our team with new talent and continue growing together! Quick Check: Is this your Engineering Playground? * Tech Stack: Python (Django/FastAPI), PostgreSQL/TimescaleDB, Redis, Celery, Docker, AWS, GitLab CI/CD, Sentry, Grafana * Your Focus: Support API and data projects, build and improve backend features, help connect real-time data and analytics, automate tasks, and contribute to both greenfield and legacy improvements * Team: Platform squad with Senior Engineers (API & Data focus), a Modelling expert, and direct CTO access—collaborative, async-friendly, pair programming, lots of mentoring * Product: Advanced energy trading & optimization platform, real-time APIs, data-driven, ML-integrated, high complexity * Who thrives here: Junior backend engineers eager to learn, contribute, and develop skills in both API and data/backend engineering * Must-haves: 1–3 years backend experience, solid Python skills, first experience with SQL databases, keen interest in APIs & data, willingness to learn new tools, collaborative mindset * Dealbreakers: No backend coding experience, no interest in both APIs and data, desire to work fully solo YOUR MISSION * Work closely with Senior Engineers to help design, build, and optimize backend features and APIs * Support the development and maintenance of databases, data pipelines, and real-time integrations * Participate in automating workflows and improving reliability, scalability, and security across the platform * Collaborate with data science, modelling, and product teams to deliver features for energy trading and analytics * Contribute ideas and improvements—whether for new greenfield projects or for optimizing legacy systems * Grow your skills through code reviews, pair programming, and regular feedback in a supportive team environment YOUR PROFILE * 1–3 years’ experience in backend development (Python, ideally with Django or FastAPI) * Hands-on experience with SQL databases (e.g. PostgreSQL) and an interest in data-driven products * Eager to learn API design, event-driven systems, and cloud tools (AWS, Docker, CI/CD etc.) * Collaborative, proactive, and open to feedback—ready to work in a team and learn from others * Good communication skills in English (B2); bonus if you have worked in international or cross-functional teams * Dealbreakers: No backend coding experience, no willingness to learn both API and data topics WHY US? * People at the Core: Clear structures, democratic decisions, and a feedback culture where your voice counts. * Shape the Future: Contribute to the energy transition by working on sustainable energy solutions in a growing market environment. * Connecting & Co-Creating: Strategy off-sites 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. * Good Vibes: Yoga, shared lunches, after-work fun – we keep the energy up, even when it's busy. * Body & Mind: Urban Sports Club membership, wellbeing check-ins, and mental health support – your energy matters. * New Office: 10th-floor office with rooftop terrace, canteen, great views, ergonomic desks, hardware of your choice, and a pet-friendly environment. * Sustainable 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 you! suena 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.

(Senior) Full-stack Developer - Backend Focus (Python) Company Overview: Mindpeak is a Hamburg-based scale-up at the forefront of AI-driven cancer diagnostics. Our software helps pathologists analyze medical images more efficiently and accurately - already clinically deployed in more than 25 countries. Our vision is to enable personalized and effective treatment for every cancer patient - to truly improve medical care and patient outcomes around the world. Position Summary: As a Full-Stack Developer within the ML team, you’ll play a key role in designing and building the software systems that power our AI models — from database and API development to workflow automation and UI integration. You’ll collaborate closely with our ML engineers to connect engineering excellence with cutting-edge medical AI. Please note: This is an onsite position in Hamburg. You’ll work on: * Designing and implementing robust backend services and databases for AI pipelines, model results, and clinical data. * Developing and maintaining scalable, containerized systems (Docker/Kubernetes) for large-scale image processing and inference. * Supporting workflow automation and debugging across distributed systems (e.g. Dagster, Argo, Kubeflow). * Building and extending frontend components for model management and result visualization (React.js or similar). * Collaborating with ML Scientists and Product Engineers to integrate AI models into production environments. Your Responsibilities: * Architect and optimize database systems ensuring high reliability and performance. * Automate and monitor workflow execution for model training, calibration, and inference. * Maintain and document scalable CI/CD and deployment pipelines. * Ensure code quality, reproducibility, and clarity across all development processes. Your Profile: * Strong experience in Full-Stack or Backend Development (Python, Django/FastAPI preferred). * Solid experience in database development (PostgreSQL, MySQL, or equivalent). * Experience with containerization (Docker, Kubernetes) and Linux environments. * Bonus: Experience with Machine Learning integration (model APIs, inference pipelines). * Bonus: Familiarity with MLOps/DevOps tools (DVC, CI/CD, Dagster). * Bonus: Familiarity with frontend technologies (React.js or similar). * Strong communication skills, curiosity, and motivation to work in healthcare AI. Why Mindpeak: * Join a mission-driven company developing AI that helps save lives and elevates cancer diagnostics worldwide. * Work in an open, creative environment with flat hierarchies, quick decisions, and close collaboration across disciplines. * Be part of a highly skilled, international team of engineers and scientists, guided by experienced leadership and united by impact. * Enjoy a centrally located Hamburg office with a stunning harbor view, and a culture that fosters continuous learning, autonomy, and collaboration. Application Details: We’d love to hear from you! Please send us your CV, university certificates, transcripts, references, salary expectations, and let us know your earliest possible start date. You can reach us at jobs@mindpeak.ai. For more about us, visit mindpeak.ai.   Just a quick note: We’re only able to consider direct applications—agencies, please don’t apply. Thank you!