About the Role
You will lead the design and development of backend services and architecture for a brokerage API platform, taking full ownership of features in cross-functional teams. You'll ensure production reliability, focus on customer lifecycle and banking processes, and help shape scalable core systems while collaborating with experts to build investment infrastructure for millions of retail investors across Europe.
Responsibilities
- Architect and develop backend services and systems for a brokerage API platform
- Own end-to-end delivery of features and services within cross-functional teams
- Ensure stable and efficient operation of services in production environments
- Focus on key areas including customer lifecycle management, investing workflows, and banking operations
- Maintain high reliability and scalability of core platform systems
- Influence technical direction and architectural decisions for the core platform
- Collaborate with a multidisciplinary team to build investment infrastructure for retail investors in Europe
Requirements
- Proficient in writing clean, tested code using multiple high-level programming languages such as Python, Golang, Java, or Ruby, along with JavaScript or TypeScript
- Demonstrated experience designing and building highly scalable architectures and robust REST APIs
- Solid background operating software in cloud environments like AWS, GCP, or Azure, including knowledge of associated architectural patterns
- Familiarity with both document-based and relational databases such as MySQL, PostgreSQL, or MongoDB
- Capable of producing high-quality, maintainable, and thoroughly tested code
- Experienced in guiding peers through effective code reviews
- Strong analytical and problem-solving abilities for complex technical challenges
- Proven track record developing and maintaining scalable backend systems in collaborative teams
Nice to Have
- Passionate about expanding access to investment opportunities
- Prior experience in fintech or financial services is beneficial but not required
- Identifies as a product-focused engineer
- Motivated by solving real customer problems
- Driven to become a domain expert in financial technology
- Enjoys creating systems from the ground up
- Actively engaged in product development discussions
- Champions engineering best practices
- Comfortable making technical decisions
- Takes initiative to solve problems independently and decisively
- Committed to delivering high-quality results with attention to detail
- Collaborative team member who values shared success
- Naturally shares knowledge and supports peer growth
- Interested in long-term leadership opportunities
- Adaptable and eager to learn new technologies quickly
- Resourceful in applying diverse tools to solve problems
- Understands the dynamics of working in startups or lean organizations
- Effective in small, agile teams with limited structure
- Able to prioritize and move fast on critical tasks
- Sees personal alignment with the role’s expectations or potential growth path
Benefits
- Competitive compensation based on experience and impact
- Flexible working hours with core collaboration time from 12:00 to 16:00
- Hybrid work model allowing location flexibility within Germany
- Individual contributors spend at least 4 days per month on-site in Berlin
- Regular mentorship and growth opportunities
- Structured career development with frequent feedback
- Onboarding traditions including first-day polaroids and Friday market walks
- Celebration of team growth and new partnerships
- Culture of open and constructive discussion
- Sponsored Deutschlandticket for full-time employees
- 50% discount on financial education and investing via Beatvest
- Workation policy: remote work anywhere in the EU up to 10 consecutive days at a time, 60 days annually
Compensation
Competitive salary based on experience and value-add
Work Arrangement
Hybrid model with flexible hours, core hours 12:00–16:00, minimum 4 days/month in Berlin office, remote work in Germany allowed, EU workations up to 60 days/year
Team
Cross-functional team of engineers and domain experts building investment infrastructure
About lemon.markets 🍋
We empower individuals to invest by expanding access to investment opportunities across Europe. Our platform enables fintechs, banks, and wealth managers to offer compliant investment products through a simple API. As a Brokerage-as-a-Service solution, we abstract complex brokerage operations with a well-documented API, self-service tools, and clear regulatory compliance, allowing partners to launch customer-focused products in weeks. Part of the dwpbank group, we operate independently with our own team, product, and startup culture, enhanced by group resources and expertise.
Your Mission
As a Backend Engineer, you will design and implement backend services for our brokerage API platform that enables companies to integrate investing capabilities. You’ll own features from start to finish in cross-functional teams, ensuring production stability. Your work will center on customer lifecycle, investing, and banking processes, with a focus on making core systems reliable and scalable. The tech stack includes Python, FastAPI, AWS, and Postgres. While prior experience in different stacks is acceptable, enthusiasm for Python is essential. You’ll shape platform architecture and influence business outcomes, working alongside experts to build investment infrastructure for the next 100 million retail investors in Europe.
About you
You can write clean, tested code in multiple high-level languages including Python, Golang, Java, or Ruby, plus JavaScript or TypeScript. You have experience building scalable architectures and reliable REST APIs. You’re familiar with cloud platforms like AWS, GCP, or Azure and their design patterns. You understand relational and document-based databases such as MySQL, PostgreSQL, or MongoDB. You produce maintainable, high-quality, and well-tested code and support peers through code reviews. You solve complex technical problems effectively and have a history of delivering scalable backend systems in team settings.
You will be successful in this role if
You are inspired by growing investment access. Prior fintech or financial services experience is helpful but not required. You identify as a product engineer—driven by solving customer problems and mastering your domain. You enjoy building systems from scratch, actively shaping product development and advocating for strong engineering practices. You embrace technical decision-making and take ownership without oversight. You aim for excellence through focus and precision. You collaborate well, share knowledge, and mentor others, with an interest in future leadership. You adapt quickly to new technologies and think beyond familiar tools. You thrive in lean, fast-moving environments. You see yourself in these traits or are eager to grow into them. We welcome applicants even if not all qualifications match exactly—passion and learning mindset matter most.
How we take care of you
We offer a competitive salary tailored to your experience and impact. Flexible hours let you choose when you work best, with only 12:00–16:00 as shared core hours. Work from anywhere in Germany under a hybrid model, with at least 4 days per month in the Berlin office for team connection. We support your growth with mentorship, stretch assignments, and a clear career framework with regular feedback. Our culture shows in small moments—first-day polaroids, Friday food market walks, monthly new-joiner breakfasts—and big ones like celebrating team growth and fostering open dialogue. Benefits include a sponsored Deutschlandticket for full-time staff and 50% off Beatvest for financial learning. You can also work remotely anywhere in the EU for up to 10 days in a row, totaling 60 days per year.
Other
- Flexible working hours with core collaboration hours from 12:00 to 16:00
- Hybrid work model: work from anywhere in Germany, with minimum 4 days per month on-site in Berlin
- Work remotely from anywhere in the EU for up to 10 consecutive days at a time, up to 60 days per year
- Equal opportunity employer committed to building an inclusive workplace
- Candidates from all backgrounds encouraged to apply even if not all requirements are met
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