Senior Software Engineer - Personalization (f/m/d)

Contentful; Berlin; On-site; EUR 110,000 - 140,000; Full time

Job summary

Contentful in Berlin is seeking a Senior Software Engineer - Personalization to design and build high-performance backend services and APIs with a focus on reliability and low latency.

You will deliver end-to-end personalization across backend, frontend tools, and SDKs, using AI-assisted workflows and agile practices. Contentful is now officially part of Salesforce. This role requires ownership and strong English communication in a fast-moving environment.

Qualifications

• Proven experience designing APIs and services for high traffic.
• Strong server-side TypeScript and API design skills.
• Experience delivering full-stack solutions with React and SDKs.
• Experience with serverless/edge compute environments.
• Familiarity with CDN and caching to optimize perf.
• Benchmarked and instrumented code for observability and performance.

Responsibilities

• Design, develop, and maintain high-performance backend services and APIs.
• Deliver end-to-end solutions across backend and React frontend experiences.
• Implement CDN and edge-based caching for performance.
• Balance performance with clean software architecture.
• Monitor and optimize system performance with observability tooling.
• Write automated tests and maintain code quality under Agile workflows.
• Use AI-assisted coding tools responsibly to improve delivery.

Skills

API design

TypeScript

Serverless/edge compute

React frontend

Observability

Performance optimization

Agile methodologies

Tools

Cloudflare Workers

React

CI/CD pipelines

Job description

Senior Software Engineer - Personalization (f/m/d)

Berlin, Germany

About The Opportunity

Become part of the Contentful Personalization Team and help shape how leading businesses deliver personalized digital user experiences.

As a Senior Software Engineer, you will solve complex customer problems and deliver value through end-to-end personalization solutions. You will work across high-performance backend services, developer-facing frontend tools and SDKs, infrastructure, and observability to help customers deliver personalized content experiences in a performant, reliable, and developer-friendly way.

You will bring a proactive approach to problem-solving, a high sense of ownership, and a continuous improvement mindset. You will use modern AI tools, including agentic coding workflows, thoughtfully to improve how you explore, build, test, and maintain software. You will also contribute actively to the team's Agile ways of working, understanding how planning, refinement, delivery, reviews, retrospectives, and continuous improvement fit together.

What To Expect?

• Design, develop, and maintain high-performance backend services and APIs with a focus on reliability, scalability, and low latency.
• Deliver end-to-end solutions across backend services, React-based frontend experiences, and developer-facing SDKs, libraries, and tools.
• Implement complex CDN and edge-based caching solutions that allow users to retrieve personalized content in the most performant way.
• Solve technical challenges in creative ways, balancing the trade-off between performance and elegant software architecture.
• Continuously monitor and optimize system performance through benchmarking, while making sure systems are well instrumented for observability.
• Implement defensive coding practices and guarantee correctness and maintainable code through automated testing.
• Use AI-assisted and agentic coding tools responsibly to improve engineering workflows, while maintaining high standards for code quality, security, testing, and review.
• Participate actively in Agile ceremonies, including planning, refinement, reviews, and retrospectives, to help the team deliver customer value and continuously improve.
• Stay up to date with the latest technologies and constantly evaluate their potential use at Contentful.

What You Need To Be Successful?

• Proven experience building APIs and services that efficiently handle large volumes of traffic.
• Strong proficiency with server-side TypeScript and API protocol design.
• Experience delivering full-stack solutions, including React-based frontend experiences and SDKs, libraries, or tools for developers.
• Experience with serverless architectures, ideally edge compute environments such as Cloudflare Workers.
• Experience with CDN operations and caching strategies to optimize system performance.
• Hands-on experience with benchmarking, instrumenting code for observability, and performance optimization for large-scale systems.
• Expertise in defensive coding practices, ensuring system robustness and fault tolerance.
• Proficiency in using CI/CD pipelines and maintaining automated tests, including unit and end-to-end tests.
• Experience using AI tools, including agentic coding workflows, to improve software delivery while applying sound engineering judgment.
• A practical understanding of Agile delivery and how planning, refinement, implementation, reviews, and retrospectives support sustainable delivery and continuous improvement.
• A proactive approach with a strong sense of ownership.
• Great communication skills in English, especially when explaining complex technical concepts.

Contentful is now officially part of Salesforce.

If you need reasonable accommodations at any point during the application or interview process, please let your Recruiter know.

Equal Opportunity Statement

Salesforce is an equal opportunity employer and maintains a policy of non-discrimination with all employees and applicants for employment. What does that mean exactly? It means that at Salesforce, we believe in equality for all. And we believe we can lead the path to equality in part by creating a workplace that’s inclusive, and free from discrimination.

Know your rights: workplace discrimination is illegal. Any employee or potential employee will be assessed on the basis of merit, competence and qualifications – without regard to race, religion, color, national origin, sex, sexual orientation, gender expression or identity, transgender status, age, disability, veteran or marital status, political viewpoint, or other classifications protected by law. This policy applies to current and prospective employees, no matter where they are in their Salesforce employment journey. It also applies to recruiting, hiring, job assignment, compensation, promotion, benefits, training, assessment of job performance, discipline, termination, and everything in between. Recruiting, hiring, and promotion decisions at Salesforce are fair and based on merit. The same goes for compensation, benefits, promotions, transfers, reduction in workforce, recall, training, and education.