Senior Product Engineer at Langfuse | Europe

LangfuseEurope

Hybrid Full-time

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Experience Level

Senior

Qualifications

QualificationsProven experience in product engineering, preferably with open-source technologies. Strong understanding of AI and LLM applications. Hands-on experience with software development and deployment. Excellent problem-solving skills and ability to work collaboratively in a team. Familiarity with GitHub and community engagement.

About the job

Join Langfuse as a Senior Product Engineer

At Langfuse, we are revolutionizing the way teams build AI applications with our open-source LLM Engineering Platform. As part of ClickHouse, we help organizations enhance their capabilities through innovative solutions like tracing, evaluation, and prompt management.

We are building the 'Datadog' of AI observability, providing essential tools to simplify the development of useful applications for both startups and enterprises.

With over 2,000 customers, including 19 of the Fortune 50, and more than 26 million SDK downloads monthly, Langfuse stands as the leading open-source solution in our field.

Our engineering team, based in Berlin and San Francisco, is small, experienced, and dedicated. We are seeking passionate engineers in European time zones, with expectations of one week per month in our Berlin office.

Why Work at Langfuse?

Your contributions will make a significant impact. Everything we create is open source (MIT-licensed) and highly visible. With over 21,900 GitHub stars and 23 million monthly SDK downloads, your work will be recognized and appreciated by the community.

As a Senior Product Engineer, you will take ownership of the product development process, from understanding user needs to delivering innovative solutions. You will have direct exposure to the development of cutting-edge LLM applications while working with some of the most ambitious software engineers in the industry.

About Langfuse

About LangfuseLangfuse is an innovative open-source LLM Engineering Platform, now part of ClickHouse, that focuses on helping teams build impactful AI applications. Our commitment to open-source solutions and self-hosting ensures that we remain at the forefront of AI observability, fostering rapid product development and revenue growth.

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Senior Backend Engineer for JimdoPay

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About JimdoAt Jimdo, we empower self-employed individuals and micro-businesses by simplifying the journey to success. Founded in 2007 by three friends in a farmhouse in Northern Germany, we have evolved into a profitable, remote-first company with over 220 employees from more than 50 nationalities, operating in over 15 countries. With over 36 million websites created, we are more than a website builder; we are an AI-driven platform that supports our users in running and growing their businesses effectively.Our commitment to personalized, data-driven guidance ensures that our platform provides clear insights and actionable steps, allowing our customers to focus on what truly matters for their business growth.Role Overview:As a Senior Backend Engineer for JimdoPay, you will play a crucial role in developing our integrated payment solution designed to support solopreneurs with a comprehensive suite of payment capabilities. You will contribute to key features, including embedded payments, link-to-pay options, and intelligent quoting tools. Collaborating closely with product, design, and engineering teams, you will ensure the delivery of secure and scalable backend services leveraging top Payment Service Providers (PSPs).Your Impact:Develop REST APIs using Kotlin or Java with a strong focus on scalability, reliability, and performance.Implement secure and efficient integrations with payment APIs.Design and develop RESTful services and event-driven architectures.Manage data storage effectively using relational databases.Contribute to CI/CD pipelines and automated testing processes.Work collaboratively across teams to deliver comprehensive solutions.What You Bring:Over 6 years of experience in backend software development.Strong expertise in Kotlin or Java.Proven skills in REST API design.In-depth experience with relational databases.Familiarity with CI/CD practices and testing automation.Excellent collaboration skills for cross-functional teamwork.

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Senior Java Backend Engineer at Atolls | Munich

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Atolls: The World’s Largest Community-Driven Shopping PlatformWe empower millions to make informed spending decisions, connecting them with the best brands and retailers across 20+ markets.Join our diverse team of over 1,000 professionals in 10 countries and contribute to products that impact global shoppers daily. Ready to make a difference? Read on!About This Role:We are seeking a Senior Java Backend Engineer to enhance our dynamic engineering team in Munich. In this pivotal role, you will be instrumental in designing, developing, and scaling high-performance backend systems utilizing cutting-edge Java technologies and cloud-native architectures. Ideal candidates are those who thrive in tackling complex systems, prioritize code quality, and possess a robust architectural perspective.Our Benefits:At Atolls, we prioritize your professional and personal growth. Here's what you can look forward to:A culture that champions personal and professional development, along with ample internal mobility opportunities.A welcoming and innovative team that values diverse perspectives.32 days of paid vacation plus an additional day off for your birthday.Flexible hybrid work arrangements to help balance your professional and personal life.Access to a learning budget and internal training resources to foster your development.Support through mental health coaching to promote well-being.Regular global and local events to celebrate achievements and foster connections.The opportunity to take a sabbatical after three years of service.A cloud-based setup that allows for collaboration from anywhere.*These benefits are applicable globally, with additional local perks based on your location.Responsibilities:As a Senior Java Backend Engineer, your key responsibilities will include designing and implementing robust backend solutions, ensuring system scalability, and maintaining high standards of code quality.

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Apr 7, 2026

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Mar 6, 2026

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Backend Software Engineer

dev2

Full-time|On-site|Wilhelmstraße 118

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Nov 7, 2021

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Senior Product Security Engineer | Remote | Europe

n8n

Full-time|Remote|Berlin Office

Unleash Your Imagination with AI Orchestration.Join n8n, the revolutionary open workflow orchestration platform designed for the AI era. We empower technical teams to automate with the agility of no-code while retaining the flexibility of code, enabling them to innovate without boundaries. Supported by a vibrant community and over 500 builder-approved integrations, we are reshaping the landscape of system integration and idea scalability.Founded in 2019, our diverse team of over 220 professionals spans across Europe and the US, all united by a builder mindset with our heart in Berlin. Our journey has included:Building a community of 650,000+ active developers and builders.Achieving 145k+ stars on GitHub, ranking us among the Top 40 projects globally.Being recognized as one of Europe’s most promising SaaS startups, ranked 4th in Sifted’s 2025 B2B SaaS Rising 100.Securing $240 million in funding, from our first German seed investment by Sequoia to a recent $180 million Series C, leading to a $2.5 billion valuation.We invite you to explore what you can create with us. Take a moment to try n8n, regardless of your technical expertise, and share a screenshot of your first workflow with our team. Start your journey here: app.n8n.cloud/register.We are at a pivotal moment in our exciting journey, and we want you to build with us. As a Senior Product Security Engineer, your primary objective will be to enhance n8n’s product and platform security. You will engage directly in security initiatives that empower our engineering teams to mitigate risks, securely deploy features, and establish a robust security culture from the ground up.In collaboration with the Head of Security within our engineering department of over 50 members, you will oversee essential security workflows, elevate security practices throughout the Software Development Life Cycle (SDLC), and contribute to forming a dynamic security team.Key Responsibilities:Manage day-to-day vulnerability intake and triage processes, including handling the security inbox and bug bounty submissions.Coordinate with engineering teams for issue remediation and ensure timely resolution with clear priorities.Assist in managing coordinated disclosures, GitHub Security Advisories, and maintaining prompt communication with researchers.

Feb 3, 2026

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Senior Product Engineer at Langfuse | Europe

Langfuse

Full-time|Hybrid|Europe

Join Langfuse as a Senior Product EngineerAt Langfuse, we are revolutionizing the way teams build AI applications with our open-source LLM Engineering Platform. As part of ClickHouse, we help organizations enhance their capabilities through innovative solutions like tracing, evaluation, and prompt management.We are building the 'Datadog' of AI observability, providing essential tools to simplify the development of useful applications for both startups and enterprises.With over 2,000 customers, including 19 of the Fortune 50, and more than 26 million SDK downloads monthly, Langfuse stands as the leading open-source solution in our field.Our engineering team, based in Berlin and San Francisco, is small, experienced, and dedicated. We are seeking passionate engineers in European time zones, with expectations of one week per month in our Berlin office.Why Work at Langfuse?Your contributions will make a significant impact. Everything we create is open source (MIT-licensed) and highly visible. With over 21,900 GitHub stars and 23 million monthly SDK downloads, your work will be recognized and appreciated by the community.As a Senior Product Engineer, you will take ownership of the product development process, from understanding user needs to delivering innovative solutions. You will have direct exposure to the development of cutting-edge LLM applications while working with some of the most ambitious software engineers in the industry.

Feb 17, 2026

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Senior Backend Software Engineer (m|w|d)

idealo

Full-time|On-site|Berlin, Berlin, Deutschland

Join our dynamic team at idealo as a Senior Software Engineer for our mobile app backend and play a pivotal role in enhancing our award-winning e-commerce applications. Our platform empowers millions of users to compare prices seamlessly and make informed purchasing decisions directly from their mobile devices. As part of a fully autonomous team dedicated to mobile app development, you'll balance the use of established technologies with innovative experiments, ensuring we continually deliver exceptional user experiences and further idealo's mission. We take full ownership of the operation, technical implementation, and strategic direction of our services, and we're seeking talented individuals to support our growth.About Your RoleEnd-to-End OwnershipDevelop and operate business and web services in the AWS Cloud.Oversee the entire lifecycle of your services (YBYO): architecture, infrastructure, development, testing, security, deployment, monitoring, on-call, and maintenance.Design and develop APIs (REST/GraphQL) for our mobile applications (Android & iOS).Ensure that our services are scalable, stable, and high-performing, even during peak loads.Technical ExcellenceMake architectural decisions for modern backend systems (e.g., microservices).Enhance our cloud infrastructure using tools like Terraform and Kubernetes.Maintain high software quality through rigorous testing, code reviews, and monitoring.Identify and address technical debt effectively.Introduce new technologies and continuously refine our development processes (e.g., CI/CD, automation, AI tools).Collaboration & ImpactWork collaboratively with mobile engineers (iOS & Android) and backend colleagues.Contribute actively to technical discussions and challenge existing solutions.Share your expertise within the team through pair programming, code reviews, or tech talks.Communicate complex technical topics clearly to non-technical stakeholders.Assume responsibility within the team, including participation in on-call rotations during critical situations.

Apr 29, 2026

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Senior Backend Engineer - Golang

SumUp

Full-time|On-site|Cologne, Germany

About the Team Join the Sell Online Tribe at SumUp, where we are transforming how merchants establish their online presence. Our team designs and builds solutions that empower millions of entrepreneurs—from barbers to bakers—to sell their products and services from anywhere. With a focus on Online Store and Bookings, our products form the backbone of SumUp’s ecosystem, enabling merchants to manage appointments, showcase offerings, and process payments seamlessly from their mobile devices. We are a dynamic, cross-functional team of Product Managers, Designers, and Engineers dedicated to creating exceptional mobile experiences. As part of our team, you’ll play a vital role in expanding into new industries, bridging the gap between web and mobile platforms, and simplifying digital commerce for small businesses globally. About the Role As a Senior Backend Engineer within the Bifrost team, you will be instrumental in the development of SumUp's key merchant-facing online products. You will contribute to the growth and scalability of pivotal products such as Payment Links, Virtual Terminal, and Unified Gift Cards, while also enhancing integration products that deliver essential functionalities across various SumUp services. We seek a developer who champions reliability, collaboration, and continuous improvement. You will thrive in a high-impact environment where your contributions directly enhance merchant success and team scalability. Your Responsibilities Ensure redundancy for the scalability and continuous enhancement of SumUp’s high-priority online products. Contribute to the implementation, growth, and integration of Online Checkouts across SumUp. Engage actively in planning and review sessions at both quarterly and sprint levels, providing constructive feedback and accurate estimations. Monitor existing services and perform necessary fixes to maintain platform reliability. Implement new features with maintainable and testable code. Optimize application performance for improved scalability. Participate in code reviews to uphold high standards of code quality. You Will Excel in This Role If: You possess over 5 years of experience in backend engineering, specifically with Golang. You demonstrate a strong grasp of fundamental system architecture, design principles, data modeling, and API design. You have substantial experience with distributed and fault-tolerant systems. You are passionate about continuous learning and improvement.

Feb 19, 2026

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