Senior AI Backend Engineer

SumUp
Berlin, Germany
6 days ago

Role details

Contract type
Permanent contract
Employment type
Full-time (> 32 hours)
Working hours
Regular working hours
Languages
English
Experience level
Senior

Job location

Berlin, Germany

Tech stack

API
Artificial Intelligence
Airflow
Amazon Web Services (AWS)
Amazon Web Services (AWS)
Cloud Computing
Code Review
Continuous Integration
ETL
Data Structures
Distributed Data Store
Python
Machine Learning
Message Broker
RabbitMQ
Prometheus
Software Engineering
Data Streaming
Data Logging
Load Balancing
Large Language Models
Spark
Backend
Build Management
Kubernetes
Information Technology
Kafka
Cloudwatch
Docker

Job description

  • Architect, design, develop and deploy our AI solutions and systems in production environments, ensuring reliability, high performance and scalability.
  • Design and build the orchestrator service that coordinates AI components, data flows, and external services to deliver reliable, real-time insights to merchants
  • Develop and maintain scalable ETL pipelines or MCPs that process and sync heterogeneous data (text, images, audio) from various sources into the AI system
  • Build and optimise the LLM Gateway infrastructure, including authentication, rate limiting, load balancing, and vector database management for the RAG system
  • Create robust, high-performance APIs capable of handling multimodal data structures and high-volume requests, ensuring low-latency and production-grade reliability
  • Implement observability tooling - including telemetry, logging, and tracing - to support auditing, evaluation, and continuous improvement of AI interactions
  • Mentor backend engineers on the team, contributing to engineering standards, code reviews, and a culture of technical excellence
  • Collaborate and communicate closely with data scientists, product managers, developers and other business stakeholders to bring state-of-the-art AI solutions to Customer Support, enhancing customer experience and improving operational efficiency.

Requirements

  • Bachelor's or master's degree in Computer Science, Engineering, or a related field.
  • +6 years of experience developing software products (if they are ML or AI related is a plus)
  • Advanced proficiency in Python, with hands-on experience building and scaling backend systems in production environments using tools like Kubernetes, Docker, Airflow, and Spark.
  • Strong knowledge of cloud infrastructure (AWS, S3) and CI/CD practices, with a track record of shipping reliable, maintainable systems.
  • Experience designing APIs and working with distributed data systems and message brokers such as Kafka or RabbitMQ.
  • Comfort working at the intersection of backend engineering and AI - including familiarity with LLMs, GenAI tooling, and machine learning concepts.
  • Experience with status monitoring using cloud-native tools or 3rd party (e.g. Prometheus, Cloudwatch, ...) and LLM traceability
  • Excellent communication and collaboration skills to work effectively in cross-functional teams.
  • Ability to adapt to a fast-paced, dynamic work environment and quickly learn new technologies and techniques.
  • Strong team player (m/f/d) with the ability to work with diverse groups of people in a productive and agile manner

Benefits & conditions

  • Opportunity to work with SumUppers globally on large-scale fintech products used by millions of businesses worldwide, from our Berlin office. This involves an office-first setup
  • Commitment to Diversity and Inclusion: be part of a workplace that values and promotes diversity, fostering an inclusive environment where everyone's perspectives are respected and embraced
  • Enrolment onto our Virtual Stock Option programme: you will own a stake in SumUp's future success
  • A dedicated annual L&D budget of €2000 for your individual development, which you can use to attend conferences and/or advancing your career through further education
  • A corporate pension scheme where we match up to 20% of your contributions
  • ️ Generous time off: enjoy 28 days of paid leave plus public holidays and special leave days
  • ️ Numerous other benefits such as Urban Sports Club subsidy, Kita placement assistance, and subsidised office lunches
  • Break4me: 1-month sabbatical after 3 years of service
  • Referral Bonus: earn additional rewards by referring talented individuals to join the SumUp team

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