Job Opportunities API

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 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 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 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 an