Senior Optimizely Backend Developer
First Line Software B.V. · Amsterdam, Noord-Holland
- Location
- Amsterdam, Noord-Holland
- Work location
- Hybrid
- Posted
- Yesterday
About the job
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Senior Optimizely Backend Developer
Engineering & Development
|
Senior
Senior
Colombia
Europe
Brazil
El Salvador
|
Colombia
Europe
Brazil
El Salvador
|
Remote
open
November 17, 2025
About the company
First Line Software works with some of the world's top businesses and organizations in industries like healthcare, data engineering, warehouse automation, retail digitalization, mobile app development, and e-commerce. Our projects are as varied as our people, and our people are as talented as they come. We prefer working as a transparent and supportive team, who shares our knowledge as well as our success.
Let's see what we can create together!
The project and your role
Responsibilities
- Design, develop, and maintain robust, scalable back-end solutions using Optimizely CMS and Commerce platforms
- Collaborate with front-end developers, architects, designers, and stakeholders to deliver seamless digital experiences
- Develop integrations with third-party systems (APIs, payment gateways, CRM, etc.)
- Ensure code quality through code reviews, unit testing, and best engineering practices
- Optimize application performance, scalability, and security
- Participate in architectural discussions and technical decision-making processes
- Provide technical mentorship to junior developers and actively contribute to knowledge sharing
- Stay up-to-date with the latest Optimizely features, tools, and industry trends
Your skills
Requirements
- 5+ years of professional back-end development experience
- Solid expertise in Optimizely CMS and Commerce (minimum 2 years hands-on)
- Strong knowledge of .NET Core, C#, and modern development frameworks
- Experience with RESTful API design and integration
- Solid understanding of software design principles, architecture patterns, and performance optimization
- Familiarity with relational databases (e.g., SQL Server) and ORM tools
- Hands-on experience with version control (Git), CI/CD pipelines, and Agile methodologies
- Excellent problem-solving skills and attention to detail
Must have
- Optimizely CMS and Commerce
- NET Core
- C#
- Experience with headless CMS implementations
Nice to have
- Optimizely Certification(s)
- Knowledge of cloud platforms (Azure or AWS)
- Familiarity with testing frameworks and automated testing practices
What we can offer
The FLS difference
- Our modern stack projects are the right mix of exciting and challenging
- Gain access to our diverse range of training programs, courses, and certifications
- Choose your work style - remote, on-site or hybrid in one of our stunning offices. We offer the freedom of flexible working hours
- Enhance your language skills with our corporate English classes
- Work from anywhere and explore the world with our Workation program
Language Proficiency
English
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Step 3
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Step 4
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