Senior Software Engineer (Backend)

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Full job description

Smadex is an ad-tech company processing over 4.5 million ad requests per second with sub-100ms response times. The role is for a senior Software Engineer to join the core engineering team of 8 engineers maintaining and evolving the real-time bidding auction system. Responsibilities include designing, developing, and implementing features in NodeJS and Java, writing clean and testable code, monitoring production systems, and collaborating in an agile environment. Requirements include a Bachelor's degree in Computer Science or related field, 5+ years software engineering experience, hands-on experience with Java or NodeJS, strong foundation in data structures and algorithms, proficiency with Linux, Git, Docker, Docker-Compose, testing tools, and CI/CD frameworks, and excellent English communication skills. Bonus points for experience with key-value stores like Redis or Memcached and familiarity with AWS. The position is full-time, hybrid (2 days remote per week), located in Barcelona, Spain. Benefits include a competitive compensation package, flexible hours, meal vouchers, gym allowance, training opportunities, and a dynamic multicultural team. Visa sponsorship is not provided; candidates must have legal work permit in Spain.