Senior Full Stack Engineer

We are looking for a true Senior Full-Stack Engineer - someone who can design systems, take ownership end-to-end, and deliver production-grade features across backend and frontend. Technology is not the main criteria. Engineering maturity, system thinking, and code quality are. Experience with Go and/or React is an advantage but not required. Since 2007, MMDSmart has been a leading supplier in cloud-based business communications , delivering game-changing IT products to businesses in over 100 countries. Our success is fueled by the inspiration and innovative ideas of our team members, encouraging their growth and impacting our Messaging and Voice solutions . These empower our clients to communicate more effectively with their customers. Don’t miss this chance to excel in a rapidly expanding tech company, where your potential and ambitions are not just recognized, but celebrated. What will you do at MMDSmart? Design and implement features from idea to production Work across backend, frontend, APIs, databases, and integrations Participate actively in Scrum ceremonies and contribute to planning and estimation Take architectural decisions and improve existing system design Write clean, testable, maintainable code Perform code reviews and mentor other engineers Improve performance, reliability, and scalability of the system Work closely with Product, QA, and DevOps You are a perfect match if you have: 7+ years of hands-on software engineering experience Strong understanding of system design and architecture Proven experience building and maintaining high-load, event-driven systems Ability to work across the full stack (backend + frontend) Experience working in Agile / Scrum teams Strong ownership and accountability for delivered features Solid understanding of APIs, databases, and modern web architectures Experience with Git and CI/CD workflows Ability to learn new technologies quickly and independently Will be a plus: Experience with Go Experience with React or modern frontend frameworks Experience with microservices and distributed systems Experience with cloud environments and containers Experience with observability and monitoring tools Why do talents choose and stay at MMDSmart? Embrace the opportunity to work in a company that cares about: Your Wellness: Access to mental health programs, comprehensive medical insurance, and a sports card*. Your Happiness: Enjoy the company of cool teammates, a friendly atmosphere, a strong mentorship, and a variety of bonuses & corporate gifts. Your Development: Benefit from free educational events & courses, and English classes with native speakers. Your Career: Focus on your professional development in a supportive environment. Work-Life Balance: Choose your working format - remote, office-based, or hybrid and engage in team-building activities. Think this role's got your name on it? Go ahead and apply, we'd love to see what you've got! Equal-Opportunity Employment We are an equal opportunity employer committed to creating a diverse and inclusive work environment. All qualified applicants will receive consideration for employment without regard to race, color, religion, gender, gender identity or expression, sexual orientation, national origin, genetics, disability, age, or veteran status. *Medical Insurance and Sport Card perks are available for employees located in Bulgaria.