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Arthur Chopyk

@arthurchopyk

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Full-Stack Engineer building SaaS platforms at Exoft, including semantic search with a 4× smaller index at 95%+ recall.

Ukraine

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What I'm looking for

I’m looking for a remote Full-Stack Engineer or Full Stack Developer role where I can own features end to end and build maintainable code.

At Exoft, I developed and shipped end-to-end features for a multi-tenant SaaS platform, from API design and data modeling through production deployment. I also led research and implementation of vector search infrastructure, benchmarking hosted and self-hosted models to inform the production model choice.

I built embedding and semantic search pipelines using BGE and OpenAI, with chunking strategies, int8 quantization, Matryoshka embeddings, and HNSW indexing. This cut vector index memory footprint by about 4× while maintaining 95%+ retrieval recall.

At Exoft, I implemented RAG systems for documentation-aware chatbots and automated multi-tenant onboarding, replacing days of manual setup with an automated flow. I also optimized dashboard load times on key screens by about 40%.

Earlier at LaSoft Software Development, I delivered features across SaaS, marketplace, and internal business platforms, and built REST APIs and real-time functionality with WebSockets. I’m open to remote Full-Stack Engineer and Full Stack Developer roles, where I can own features end to end and build code that remains maintainable.

Experience

Work history, roles, and key accomplishments

Senior Full-Stack Engineer

Exoft

Aug 2024 - Jul 2026 (1 year 11 months)

- Developed and shipped features for a multi-tenant SaaS platform end-to-end — React, Next.js, Node.js, TypeScript — from API design and data modeling to production deployment
- Led research and implementation of vector search infrastructure: benchmarked hosted and self-hosted LLMs across quality, context size, latency, and infrastructure cost, and drove the production model choice
- Built embeddi

Middle Full-Stack Engineer

LaSoft Software Development

Jun 2022 - Jul 2024 (2 years 1 month)

- Delivered full-stack features for SaaS, marketplace, and internal business platforms (React, Node.js, TypeScript, PostgreSQL) across multiple client projects in parallel
- Designed and built scalable REST APIs and real-time functionality (WebSockets) for customer-facing products
- Refactored legacy modules into reusable components and shared business logic — reducing duplication and speeding up

Junior Full-Stack Developer

LaSoft Software Development

Jun 2021 - May 2022 (11 months)

- Developed and shipped production features for enterprise web applications using React, JavaScript, and REST APIs
- Built reusable UI components and application modules used across multiple areas of the product
- Collaborated with designers, QA engineers, and backend developers to deliver features from requirements to release
- Investigated and resolved bugs, improved application performance, and

Education

Degrees, certifications, and relevant coursework

IT Step University

Bachelor's degree, Computer Science

Relevant coursework: Algorithms & Data Structures, Software Engineering, Distributed Systems, Database Systems (SQL & NoSQL), Object-Oriented Programming, Operating Systems, Computer Networks, Cloud Computing, Software Architecture, Concurrent Programming.