(Senior) Software Engineer I Algorithmic Trading

companyDescription Vattenfall is a European energy company with approximately 20.000 employees. For more than 100 years we have electrified industries, supplied energy to people’s homes and modernized our way of living through innovation and cooperation. We are looking for talented individuals who, in addition to their passion for their own role, also have strong team spirit and want to contribute to supporting a meaningful corporate mission. Right in the heart of Vattenfall, at Business Area (BA) Markets, you will find an inspiring international environment, with a culture of care and personal growth, enabling you to be who you are, having fun, building strong relationships and learning every day. Find out what our colleagues think about our culture: https://youtu.be/-9qGrDUCptA We employ around 500 professionals who are active across Europe with offices in Sweden, Germany, The Netherlands, and the United Kingdom to drive the energy transition together. Our role in Vattenfall is to maximize the value of the overall portfolio by optimizing and dispatching, hedging, and sourcing for Vattenfall's sales and generation volumes. We serve as Vattenfall’s single access to energy commodity markets and trade electricity, emissions, fuels, freight, and renewable certificates. In BA Markets the mission of the Unit OU Operations is to drive the digital transformation. OU Operations consists of diverse and highly skilled employees from more than 20 countries. We work internationally from our locations in Stockholm, Hamburg and Amsterdam.. jobDescription Help us build and run the core infrastructure powering algorithmic trading in live energy markets - contributing directly to a more efficient and sustainable energy system. In this role, you’ll design and operate low-latency, highly reliable systems that influence trading decisions in real time. You’ll collaborate closely with traders, quant developers, and data scientists, working at the intersection of technology, markets, and risk. Whether you already bring solid experience or are ready to grow into a more senior role, you’ll take on increasing ownership step by step - supported by a collaborative team environment. What You’ll Do Build high-performance trading systems Design, develop, and continuously improve robust, low-latency applications together with traders and quantitative experts. Ensure reliability together as a team Contribute to the availability, stability, and performance of our systems across the full stack, supported by experienced colleagues. Improve how we operate systems Help evolve monitoring, alerting, and deployment processes to ensure stable and scalable trading operations. Explore and introduce new ideas Stay up to date with developments in technology and algorithmic trading, and bring your perspective into the team. Develop risk-aware solutions Support the implementation of safeguards, monitoring, and controls to ensure secure and compliant trading. Shape how we work Contribute to engineering best practices such as testing, documentation, and knowledge sharing. What Makes This Role Stand Out Real impact with purpose Your work contributes to how energy markets operate - supporting the transition to more sustainable energy systems. Learn and grow with ownership We support you in taking on responsibility at your own pace and developing into a senior expert role. Collaborative environment Work closely with business and tech colleagues in a supportive, low-ego, team-oriented setup. Modern technology & continuous improvement We value curiosity, innovation, and creating sustainable, long-term solutions - not just quick fixes. qualifications Your Profile We know that candidates don’t always meet every single requirement. If this role excites you, we encourage you to apply. What you bring A relevant degree, vocational training, or comparable practical experience Experience in software development (ideally with C#) Interest in building and operating production systems Familiarity with distributed systems and/or cloud technologies (e.g., Kubernetes, Azure is a plus) Analytical thinking and a structured approach to problem-solving Experience or interest in CI/CD and automated deployments Good communication skills and a team-oriented mindset Fluent English (written and spoken) What helps you stand out Experience with Linux environments Knowledge of trading protocols (e.g., FIX) Exposure to trading, energy markets, or other high-availability systems additionalInformation Benefits Your development is a priority at Vattenfall BA Markets. Your professional journey will benefit from working in the exciting industry of energy trading, and in interdisciplinary teams. To support your career, we offer opportunities to grow through training, job rotations, talent programs and a working environment that stimulates learning. Our work culture at Vattenfall is excellent. We have an open corporate culture with flat hierarchies. Modern and flexible working conditions, including mobile work, promote wellbeing. In Germany, our work week consists of 37.5 hours with, in many cases, the possibility to work part-time. Up to 49% of your working time can be mobile work, and you are entitled to 30 days of vacation per year. Your health is important to us. We provide several health programs and support throughout potentially challenging life situations. Your colleagues will be another highlight. We employ inspiring people with diverse backgrounds. Together with our culture and your tasks, they form an interesting and fun place to work. You can find our new state of the art office next to Elbbrücken. More information We welcome your application in English, no later than 24th of June 2026. We kindly request that you do not send applications by any means other than via our website as we cannot guarantee that we will be able to process applications that are not made via our website. For more information about the recruitment process you are welcome to contact our Recruiter Jil Ungethüm via phone at +49 40 79022 1378. At Vattenfall we are convinced that diversity contributes to build a more profitable and attractive company and we strive to be good role model regarding diversity. Vattenfall works actively for all employees to have the same opportunities and rights regardless of gender, ethnicity, age, transgender identity or expression, religion or other belief, disability or sexual orientation. The security of Vattenfall and its employees is essential. For that reason, a pre-employment screening will be part of your recruitment process. The screening is based on the role you will fulfill within Vattenfall. The screening will be performed by a third party, called DISA. In addition, a certificate of good conduct (i.e. criminal record certificate) is required for certain positions. We look forward to receiving your application!