Engineering \& Development \| Senior Senior Europe Colombia Serbia Montenegro Slovakia APAC \| Europe Colombia Serbia Montenegro Slovakia APAC \| Remote September 4, 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 Our Hiring Process**Getting started with us** --------------------------- Here's what you can expect when you send us your application### **Step 0** ### **Tech Talent Hunt** Be scouted or apply for your role### **Step 1** ### **Meeting \& Connecting** Our first step to building lasting relationships ### **Step 2** ### **Uncovering Potential** Your HR interview ### **Step 3** ### **The Code Challenge or Technical Interview** It's time to show what you can do best! ### **Step 4** ### **Client’s Interview** Demonstrating expertise to our future partners ### **Final** ### **The Last Piece of the Puzzle** Job offer to finalize our tech team **Join our team of innovative thinkers** ======================================== **Let’s talk!** --------------- Have any questions? Fill out the form and our team will be in touch!