Senior Backend Engineer (m/f/d)

This role offers the chance to build a modern Brokerage-as-a-Service platform from the ground up, shaping the architecture and technical decisions from day one. You’ll have a high degree of ownership with direct, measurable impact on a product that powers investment experiences and expands access to new financial opportunities. Expect to tackle complex, high-scale problems daily, mentor and uplift more junior engineers, and thrive in a fast-paced, product-focused environment.

As Senior Backend Engineer at lemon.markets you will play a key role in designing the backend services and architecture of our brokerage API platform that allows other companies to easily embed investing into their product. You will take ownership of features and services end to end in cross-functional teams, ensuring they run smoothly on production.

You will focus on areas of the Customer Lifecycle, Order Lifecycle or Post-Trade processes - making sure our Core Platform & Systems around it are reliable & scalable.

Our Tech Stack is Python, FastAPI, AWS and Postgres. While you can have worked in different modern tech stacks prior, you should be excited to work in Python and learn it if you haven’t worked with it before.

You will have a significant impact on the development of our core Platform & Systems - and thereby architectural decisions, as well as on the business itself. Work alongside a cross-functional team of experts, and together we will leverage your previous experiences to build the investment infrastructure for the next 100 million retail investors in Europe.

• You have the ability to write well-structured and tested code in more than one high-level programming languages like Python, Golang, Java or Ruby, plus another language such as Javascript or Typescript.
• You have experience in designing and implementing highly scalable architecture and reliable REST APIs and bring the desire to make them world-class.
• You’ve gained good experience with software in a cloud environment (AWS, GCP, Azure) and the architectural patterns for this environment.
• You have a good understanding of more than one document-based or relational database technology such as MySQL/PostgreSQL or MongoDB
• You know how to write high-quality code that is understandable, maintainable and well tested, and can guide other engineers to do the same via code reviews.
• You have good problem-solving skills and the ability to provide in-depth evaluations and analyses of unique and complex technological issues.
• You have a track record of designing, building and operating reliable and scalable backend systems as part of a cross-functional team.

At lemon.markets, our Engineers working in domains, we currently have 3 product domains. Each domain composed by a Product Manager, an Engineering Manager and 3-4 backend engineers from mid to senior levels.

About the process

Hiring can be an exhausting process, especially when you're the one trying to get hired. Therefore, we try to make this a fast and transparent process. Additionally, you will always have one contact person guiding you through the process and helping you to schedule meetings, and setting you up on a path of success. Your process will look like this:

1. Get to know us - Talent | 40 minutes
2. Take Home test (In Python) + Review
3. Meet the team @ lemon.markets HQ | 120 minutes
1. System Design - Backend Engineers | 60 minutes
2. Principles Session - a selection of lemoneers | 60 minutes