Junior Backend Engineer Platform (API & Data)

• 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, * 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.

Do you have experience in SQL?, 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., 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, * 1-3 years' experience in backend development (Python, ideally with Django or FastAPI)
• First 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

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 - and we're excited to welcome new talent ready to grow with us.