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Serafim
@serafimsen
Full Stack Developer, Web and Mobile Apps, AI Solutions, Psychology Driven UX
Belarus
Russian
About me
I combine 8 years of software engineering with a formal Psychology degree to build digital products that don't just work, they convert, retain, and delight users.
I've shipped 50+ projects: SaaS platforms, AI-powered apps, fintech dashboards, and viral mobile apps with 1M+ downloads.
Stack: React, Next.js, Flutter, FastAPI, Python, Node.js, OpenAI, AWS.
Specialty: Psychology-driven UX/UI that turns visitors into loyal customers.
Deadlines are sacred. Quality is non-negotiable. Let's build.
Skills
Serafim
Offline •
Average response time: 1 hour
See my services
Cross-Platform Development
I will build your ios and android app with backend, ai features, and full deployment
AI Websites & Software
I will build your ai saas web app, ai agent, website with backend api and full deployme
Portfolio
Work experience
Founder and Lead Developer
LiveEQ
Dec 2017 - Present • 8 yrs 5 mos
Founded and built LiveEQ.ru — an AI-powered psychology SaaS platform with 10,000+ active users. Architected the full stack: React frontend, FastAPI backend, PostgreSQL, deployed on cloud infrastructure. Integrated GPT-4 for AI psychologist chat, built subscription billing, and designed UX that achieved 4.8-star app store rating. Grew from 0 to revenue in 6 months.
Mobile App Developer
Freelancer.com
Dec 2014 - Present • 11 yrs 5 mos
Built 30+ custom mobile apps for international clients using Flutter and React Native. Specializations: AI integrations, e-commerce, fintech, and mental wellness apps. Consistent 5-star ratings. Total client revenue generated exceeded $2M across delivered projects.
8 Reviews
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Rating Breakdown
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1-5 out of 8 Reviews
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user07516374
United States
good service, and professional work on time! Recommend!!!
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hannahyang833
United States
Absolutely great shooting!! I will work with you more and more! so happy to work with you!!💝💝💝💝
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shartratechnolo
Repeat Client
India
Great happy with seller .
Helpful?
shartratechnolo
Repeat Client
India
Great I use him for my next order now .
Helpful?
teamdigimarketi
India
Seafimsen have professional attitude towards the work he has completed my work on priority thanks mat will love to work with again
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