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jonny czar about services cases jonny czar is software engineer at hotjar 12 years of coding full stack scalable systems view cases 6 years experience 40 projects delivered 10 saas products built 99 9 uptime systems about apple editors choice specialization frontend react next js backend node js go built and scaled systems at n26 worldpackers and brazil s largest private bank from mvp to 10m users also develop game websites webgl experiences and real time multiplayer backends who i work with startups scale ups product companies and gaming studios preparing for growth worked alongside 250 engineers on high stakes fintech systems led architecture for travel tech with global reach and built high performance game landing pages interactive web experiences approach performance scalability clean code every system from banking to gaming is ready for traffic spikes maintained without drama and documented to keep teams moving fast services what i actually build for you full stack development react next js frontend node js go backend from mvp to high load production api system design rest graphql idempotent payments database sharding fraud proof transactions performance scalability latency optimisation database indexing caching strategies load testing saas product development auth payments background jobs observability built for startups to series a code review tech audit clean code architecture flaws team velocity bottlenecks with actionable fixes legacy modernization monolith microservices zero downtime migrations go node js adoption apple editors choice worldpackers featured in the app store for excellent clean code and architecture app store app of the day worldpackers featured in the app store development code quality category see more one of the best engineering portfolios presented by ux collective but for systems design and backend architecture see more advancing the european banking system n26 graduate creator of the core transaction and database sharding engine see more produto pelo mundo podcast moving abroad as a software engineer portuguese only see more speaker at interaction latin america engineering track a look at the design of brazil s largest private bank from database sharding to idempotency see more host speaker at code games meetup 100 devs 3 hours of live coding game performance workshops see more reviews what clients say diego simões cto at worldgames jonny helped us scale our gaming platform to 10m users his api and caching work was a game changer for matchmaking elena schmidt eng manager at n26 gaming cleanest node js code i ve seen he rebuilt our rewards system and cut fraudulent claims by 40 overnight bruno andrade founder at playstart jonny audited our game site before launch fixed 3 critical bottlenecks in 2 weeks launch went perfectly carla mendes head of eng at iplay games his webgl workshop for 100 engineers was incredible still using his patterns six months later ready to scale your product ready to scale your product let s talk view cases disclaimer no real money is used exchanged or required all gaming mechanics shown are technical demonstrations only 18 quick links jonny czar about services cases legal cookie policy privacy policy terms of use disclaimer responsible gaming more work on bē behance company szerencsejáték zrt budapest csalogány utca 30 1015 magyarország 2026 munifail com all rights reserved