Open to opportunities

Volodymyr Kozieiev

@volodymyrkozieiev

Senior Clojure/ClojureScript developer shipping production re-frame/reagent apps—full-stack, mobile, and automation-focused with strong open-source teaching.

Portugal

Message

What I'm looking for

I’m looking for EU-remote work where I can build and iterate production Clojure/ClojureScript systems (re-frame/reagent, full-stack, and mobile). I value quality architecture, fast feedback loops, and teams that ship.

I’m a Senior Clojure/ClojureScript developer with 6+ years shipping production re-frame/reagent applications. I’ve contributed 170 open source PRs into a production re-frame/reagent mobile app, and I enjoy building systems that stay reliable as they scale.

At SEOCarousel, I worked on a full-stack Clojure/ClojureScript SaaS using Reitit, Helix, PostgreSQL, Supabase, and Stripe. I improved onboarding performance by cutting AI-prep latency 42%, reduced onboarding image-generation cost 4x, and built schema-constrained, predictable LLM output with strong prompt-injection protections.

I also lead product-minded engineering with mobile experience: I solo-built and launched “FYP Dance,” an iOS app built with ClojureScript/re-frame and React Native, including paywall monetization via RevenueCat. I structure UIs with layered architecture (gateway/domain/app/ui) and use pure finite state machines to keep behavior explicit and testable.

Beyond software, I’m a technical educator—my Clojure content has generated 35k YouTube views. I’m based in Lisbon and available for EU-remote work with full European working-hours overlap.

Experience

Work history, roles, and key accomplishments

Current

Clojure Full-Stack Developer

Current

SEOCarousel

Feb 2026 - Present (5 months)

Built an AI-powered SaaS in Clojure/ClojureScript with a Reitit backend and Helix frontend for creating and publishing TikTok carousel posts. Improved onboarding latency and LLM output reliability while adding prompt-injection protections, observability, and Stripe Checkout billing.

Clojure ClojureScript Helix PostgreSQL Supabase Stripe LLM Prompt Injection Mitigation NFKC Normalization Correlation IDs Observability Billing

Current

Senior ClojureScript Developer

Current

FYP Dance

Jan 2026 - Present (6 months)

Solo-built and launched an iOS app for learning dance choreography using TikTok/Instagram videos, built with ClojureScript/re-frame and React Native. Integrated RevenueCat paywall monetization and used a workflow around Claude Code skills to streamline development.

ClojureScript React Native iOS app store RevenueCat Figma Claude Code TikTok Instagram

Senior ClojureScript UI Developer

Status

Nov 2022 - Jan 2026 (3 years 2 months)

Developed the ClojureScript/re-frame UI for a mobile crypto wallet embedded in the Status messenger app across iOS and Android. Shipped multiple releases, improved maintainability by removing extensive linter warnings, and implemented a layered architecture for the re-frame app.

ClojureScript Reagent Go iOS Android Release Management Linting UI Development Architecture Design

Clojure Content Creator

Independent Technical Content Creator

Jul 2021 - Nov 2022 (1 year 4 months)

Created educational Clojure/ClojureScript content and published guides to help developers. Wrote a widely shared “Clojure CLI, tools.deps and deps.edn guide.”

Clojure ClojureScript YouTube Content Creation DEP (Apple)

ClojureScript Developer

Status

Aug 2019 - Jul 2021 (1 year 11 months)

Developed a decentralized Ethereum messenger across iOS/Android and desktop using ClojureScript/re-frame with React Native. Expanded the codebase to additional desktop platforms and improved security via WebView camera permission controls and fixes for a remote code execution vulnerability.

ClojureScript React Native MacOS Windows Linux Camera Permission Handling Vulnerability Remediation Community Management Link Previews

C++/Qt Developer

Status

Aug 2017 - Jul 2019 (1 year 11 months)

Implemented and optimized a custom React Native desktop solution using C++/Qt and QML for the ClojureScript/React Native mobile app. Improved performance and memory usage and integrated the Yoga layout engine for desktop layout functionality.

C QML React Native FlatList Optimization Scenegraph Request Optimization Yoga Layout Engine Memory Management

C++/Qt Developer - Team Leader

GlobalLogic

Jan 2005 - Jan 2017 (12 years)

Enabled medical device UI development without a ready backend by implementing a layered architecture. Drove adoption of a new UI technology by running a 2-day workshop for 20 engineers.

QML Workshop Facilitation Team Leadership

C++/Qt Developer - Team Leader

GoldGMT

Jan 2005 - Jan 2017 (12 years)

Led a team and architected the UI for an embedded project (a phone for visually impaired people). Managed UI development efforts using a C++/Qt stack as part of the broader embedded product work.

Team Leadership C QML UI Architecture Embedded UI Accessibility

C++/Qt Developer - Team Leader

Aldec

Jan 2005 - Jan 2017 (12 years)

Managed a team of three and contributed to a SystemVerilog compiler by adding new language features. Delivered compiler-related improvements as part of the embedded toolchain work.

Team Leadership Compiler Development