Backend Software Engineer

If you are passionate about cloud software development, team collaboration, and creating outstanding backend code, join Spirii's fantastic growth journey to lead the way for a sustainable future. Spirii develops and provides world-class charging products and digital solutions to customers with electric cars. Our Digital Development department is proud to drive a listen, learn, and lead culture that allows us to constantly improve our ways of working, including how we adopt AI to raise the quality and speed of our engineering. As a Backend Software Engineer in our Payments team, you will help enhance the backbone of the Spirii platform that turns charging data into accurate invoices, credit memos, and payouts. It's a domain where correctness and financial data integrity are non-negotiable. You will report to an Engineering Manager and work closely with CPH and near-shore colleagues, as well as Finance and partner teams.

WHAT YOU WILL DO

Together with your team, you will be responsible for:

• Designing, building, and maintaining scalable backend services using Node.js, NestJS, and TypeScript that power the data ingestion, processing, and invoice generation.
• Building high-throughput, cloud-native, secure, scalable queue-based processing that reliably handles large data volumes under heavy load.
• Ensuring financial accuracy and data integrity, including correct aggregation and safe handling of late or updated records.
• Building and maintaining integrations with internal services and our ERP system.
• Contributing to architectural decisions and solution design for cloud-native, distributed, event-driven systems on AWS.
• Driving the adoption of automated testing, including unit, integration, and load testing, to protect billing correctness as flows evolve.
• Building observability, reconciliation checks, and tooling that detect data discrepancies early.
• Participating in pair-programming, code reviews and providing constructive feedback.
• Use AI coding assistants to accelerate everyday development, including code generation, refactoring, test writing, and faster onboarding to a complex billing domain.
• Exploring agentic workflows to automate repetitive engineering tasks and free up time for higher-value work.
• Be interested in learning and experimenting with new AI practices, helping the team use AI safely and effectively in a financially sensitive codebase.

WHO YOU ARE

• Like to explore innovative technologies, including AI tools and agentic workflows, and continuously expand your skills.
• Ambitious on behalf of our customers, our company, and yourself, while focusing on excellent execution.
• Have a high sense of ownership in your work and actively maintain operational awareness, especially important when your code moves money.
• A passion for delivering high-quality, cloud-native software solutions, with care for correctness and auditability.
• Care about how your work, behavior and attitude affect those around you, an active participant not only in feature creation but in creating an open, collaborative team environment.
• Comfortable working in agile, cross-functional teams alongside backend, frontend, and partner stakeholders, and collaborating with non-technical Finance colleagues.
• Excellent English communication skills and the ability to interact with all levels of the organization, internally and externally with partners/customers.

QUALIFICATIONS

• Bachelor's degree in Computer Science, Software Engineering, or a related field (or equivalent experience).
• 7+ years of professional software development experience.
• Strong experience with TypeScript or JavaScript (Node.js, NestJS); cloud-based microservice and event-driven architecture; building high-performance backend systems, including queue/job-based processing; and cloud platforms such as AWS.
• Hands-on experience with test-driven development, test automation, integration and load testing.
• Strong SQL and data-modelling skills, with the discipline needed for financially accurate, auditable data.
• Experience integrating external and internal IT systems, and solid API design.
• Experience with developing secure software is a plus.
• Knowledge of Redis, and NoSQL databases is an advantage.
• Experience working with or integrating ERP systems (e.g. Microsoft Business Central) is an advantage.
• Experience with billing, payments, invoicing, or other financial/transactional systems is a strong plus.
• Hands-on experience using AI assistants and/or agentic workflows to improve engineering productivity is a plus.

BENEFITS

It is important for us to create a healthy, diverse, fun, and creative working environment, so besides all the basic benefits, we also focus a lot on social activities, flexible working hours and a good work-life balance.

• Flexible Work Environment: Enjoy a collaborative, inclusive, and open workplace designed to fit your needs and support work-life balance.
• Competitive Package: A competitive salary, an 11% company pension plan, and a comprehensive benefits package.
• Time to Recharge: Benefit from 32 paid vacation days (5 weeks + 5 extra) and paid parental leave to focus on what matters most.
• Career Growth: Access professional development opportunities and grow your career in a high-impact, high-growth industry.
• Stay Energized: Enjoy excellent coffee, tea, free snacks, and subsidized lunches at the office.
• Stay Active: Use our Spirii gym and shared company car to keep moving.
• Make an Impact: Be part of a team driving the future of sustainable energy while working on meaningful projects.
• Two innovation days per month for YOU to choose what you work on.

The position is a permanent position in Copenhagen, Denmark. Danish language is not a requirement, but fluent English language skills are required.

ABOUT SPIRII – WHO WE ARE

Spirii is a full-service e-Mobility provider, which offers hardware and software charging solutions to companies in the private and the public sector. Spirii has recently celebrated its six-year anniversary as a founded company; however the people in Spirii have extensive experience working with electric cars and charging, as well as the development of future transport and energy systems. Spirii is an equal opportunity employer. We encourage applications from candidates of all backgrounds and experiences. Spirii strives to create an inclusive and diverse workplace, and we encourage all qualified applicants to apply regardless of age, gender, race, sexual/religious orientation, or disability.