Vladimir Zahradnik
Backend developer
+739057461 | Hradec Králové Czech republic | lada.zahradnik@gmail.com
Personal blog | Linkedin | Github
Professional Summary
Dedicated and self-motivated backend developer with 7+ years of developing scalable and maintainable software. Equipped with a robust foundation in computer science and years of hands-on experience, I bring a blend of technical expertise and innovative problem-solving skills to the table. My career journey has been marked by a relentless pursuit of new knowledge by self learning, constantly striving to optimize systems and enhance performance. With a keen eye for detail and a commitment to delivering scalable and efficient solutions, I thrive in dynamic environments where challenges fuel creativity. My proficiency extends across a spectrum of backend technologies, enabling me to develop, and maintain robust infrastructure tailored to meet the demands of modern applications.
Areas of expertise
- Golang, Rust, Java, Python
- Databases PostgreSQL, Sqlite, Redis
- Elasticsearch, Qdrant
- Kafka, NATs
- Kubernetes, Docker, Nixos, Linux, Proxmox
- Prometheus, Grafana, Open telemetry
- Caching, Load Balancing
- Infrastructure architecture
- DevOps practices
- Performance optimization
- Open source contributions
- Problem solving and troubleshooting
Professional Experience
Nextap solutions s.r.o., Prague, Czech republic
Promoted to the Lead Backend Developer at Nextap Solutions developing Steller platform to lead team of multiple developers. I spearheaded technical development initiatives, including supervising the successful migration of APIs from Java to Go. Architected new backend microservice architecture increasing developer productivity and flexibility. Built microservices including analytic service, media encoding pipeline and AI based search service.
- Developed scalable internal analytic service handling 300 events every minut
- Leading technical development of new features
- Supervised API migration from Java to Go increasing throughput by up to 300%
- Migrated infrastructure from Heroku to Kubernetes
- Architected and developed internal encoding platform for audio, video and image reducing
- Oversaw completion of internal content search and, index pipeline based on vector database
- Developed scalable distributable content delivery service for our partners
Nextap solutions s.r.o., Prague, Czech republic
Hired by Nextap Solutions to introduce machine learning into Steller platform. I proposed and implemented novel approaches to measure user's engagement with content. Developed graph based neural networks capturing not only content but also relations of interactions.
- Developed ML based recommendation system increasing engagement time by 40%
- Identified content engagement metrics on the platform
- Redefined analytic visualization in Kibana
mCoreCode, Pardubice, Czech republic
Hired as external consultant to help develop full stack applications for various project. Helped prototype inovative approaches to language learning. Constructed secure readonly storage for medical records. Contributed to open source with first Apple pay Flutter integration.
- Development of multiple mobile applications in Flutter
- Helped develop backend in Elixir for education mobile application
- Participated in requirements gathering to solidify prerequisites and determine best technical solution to meet business needs
- Rapidly prototyped new business requirements
Generali Česká Pojišťovna, Hradec Králové, Czech republic
Joined Generali as student helping with React frontend development of application for one of the biggest insurance companies in Czech republic. I helped maintain and futher develop the only public facing revenue generating application. I slowly transitioned into fullstack role and taking ownership of newly created micro frontends.
- Participated in full company rebrand with fintech focus
- Reduced size of loaded up to 600% by creating share dependency resolver
- Used Java Spring and React to develop web insurance applications
- Rewrote parts of website from Jquery to ES6
- Worked with platform team to integrate new features