Role:This?role?will?be?responsible?for?the?technical?leadership?and?implementation?of?rich?interactive?experiences?and?innovative?client-side?web?applications?leveraging?HTML5,?CSS3,?and?JavaScript?on?both?desktop?and?mobile?browsers.In?addition?the?responsibility?will?expand?existing?high-traffic?web?products?for?all?rakuten?travel?serviceses?and?make?requirement?of?web?performance?to?API?designer?or?product?manager?or?Server?Engineer.?Responsibilities:—Develop?and?maintain?rakuten?travel?websites?and?rich?interactive?experiences—Update?existing?client?and?rakuten?travel?websites,?develop?cross-browser?responsive?web?applications—Research?code?design?patterns,?UI?techniques?and?emerging?web/mobile?technologies—Develop?web?application?for?web?performance—Be?the?performance?expert?from?front(user)?end?side—Works?well?with?API?designer?and?server?engineer?and?product?manager?with?especially?performance?tenet?to?know?what?is?appropriate?to?build—Do?whatever?it?takes?to?make?high?quality?UX?and?speed?web?site?successful!Minimum?Qualifications:?—In-depth?knowledge?and?experience?designing?and?developing?client-side?interactive?features?using?HTML5,?CSS3,?and?JavaScript—Knowledge?of?other?Javascript?libraries?(Angular2.0,?Backbone,?Underscore,?etc.)?—Day-to-day?leadership?for?the?front?end?development?team(Technical?Skill?:?Java?script?/?React.js?/?AngularJS?2.0?~)Preferred?Qualifications:?—In-depth?knowledge?and?experience?designing?and?developing?client-side?interactive?features?using?HTML5,?CSS3,?and?JavaScript—Day-to-day?leadership?for?the?front?end?development?team—Excellent?understanding?and?experience?with?Responsive?Web?Design?(RWD)