Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

I'm Svetoslav Kirov, a seasoned principal full-stack engineer with over 20 years of experience in web and mobile development. I specialize in React and React Native and have a proven track record of leading cross-functional teams, raising code standards, and designing scalable architectures. I enjoy turning ideas into shipped products across fintech, e-commerce, and publishing, mentoring engineers along the way and driving continuous improvement. I thrive on building cohesive user experiences across web and mobile and guiding teams through the full SDLC with a focus on quality and collaboration.…I'm Svetoslav Kirov, a seasoned principal full-stack engineer with over 20 years of experience in web and mobile development. I specialize in React and React Native and have a proven track record of leading cross-functional teams, raising code standards, and designing scalable architectures. I enjoy turning ideas into shipped products across fintech, e-commerce, and publishing, mentoring engineers along the way and driving continuous improvement. I thrive on building cohesive user experiences across web and mobile and guiding teams through the full SDLC with a focus on quality and collaboration.

Svetoslav Kirov

Full Stack Developer, Back-End Developer, Front-End Developer, +3





I'm Svetoslav Kirov, a seasoned principal full-stack engineer with over 20 years of experience in web and mobile development. I specialize in React and React Native and have a proven track record of leading cross-functional teams, raising code standards, and designing scalable architectures. I enjoy turning ideas into shipped products across fintech, e-commerce, and publishing, mentoring engineers along the way and driving continuous improvement. I thrive on building cohesive user experiences across web and mobile and guiding teams through the full SDLC with a focus on quality and collaboration.…I'm Svetoslav Kirov, a seasoned principal full-stack engineer with over 20 years of experience in web and mobile development. I specialize in React and React Native and have a proven track record of leading cross-functional teams, raising code standards, and designing scalable architectures. I enjoy turning ideas into shipped products across fintech, e-commerce, and publishing, mentoring engineers along the way and driving continuous improvement. I thrive on building cohesive user experiences across web and mobile and guiding teams through the full SDLC with a focus on quality and collaboration.

Available to hire

I’m Svetoslav Kirov, a seasoned principal full-stack engineer with over 20 years of experience in web and mobile development. I specialize in React and React Native and have a proven track record of leading cross-functional teams, raising code standards, and designing scalable architectures.

I enjoy turning ideas into shipped products across fintech, e-commerce, and publishing, mentoring engineers along the way and driving continuous improvement. I thrive on building cohesive user experiences across web and mobile and guiding teams through the full SDLC with a focus on quality and collaboration.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Language

Bulgarian

Fluent

English

Fluent

German

Fluent

Russian

Advanced

Work Experience

Team Lead at Digital Ltd

March 1, 2025 - February 1, 2026

Led development of OSI Wallet, a secure Web3 wallet enabling Bitcoin and blockchain integrations; guided engineering teams to adhere to best practices and high-quality code standards; architected scalable fintech solutions ensuring crypto-to-transaction integrity and regulatory compliance; mentored junior developers and oversaw the full SDLC from requirements through deployment; built cross-platform mobile features with React Native for consistent UX across iOS and Android.

Principal Engineer & Team Lead at BankingOn Remote

March 1, 2023 - February 1, 2025

Designed and led a React-first rebuild of customer and admin portals, introducing a query-driven server cache and standardized forms system; developed a shared component library documented in Storybook with interactive and accessibility tests; implemented type-safe APIs via code generation from OpenAPI, reducing runtime errors and improving developer experience; collaborated with Python/Flask teams on API design, versioning, and error envelopes; introduced observability with App Insights and performance budgets using route-level chunks and Suspense patterns; mentored over five engineers, instituting code review guidelines, CI quality gates, and release hygiene on Azure; prototyped AI features leveraging OpenAI, Anthropic and Gemini models to deliver streaming chat interfaces and tool-calling adapters; implemented new mobile banking features using React Native with a unified web/mobile codebase.

Senior Software Engineer & Team Lead at Phos LTD

June 1, 2021 - February 1, 2023

Migrated a large legacy codebase to TypeScript and modern React, introducing a query for server cache and Zustand for local state; delivered merchant dashboards and internal admin tools with complex forms, inline validation, and optimistic updates; added end-to-end coverage via Cypress and standardized Storybook documentation, reducing regressions; coordinated with product and design teams to define UI patterns, empty states, and error boundaries; managed a team of five developers across full-stack, backend, and frontend; introduced React Native to mobile development process, architecting Android and iOS applications with shared business logic.

Senior Engineering Manager & Owner at Valteo Digital Ltd

July 1, 2017 - May 1, 2021

Delivered React-based SPAs and Next.js sites for e-commerce, media, and admin tooling with SSR/SSG; designed and implemented design systems and component libraries documented in Storybook; set up CI/CD pipelines and infrastructure as code, coaching teams on testing strategies and performance; managed a team of eight developers across full-stack, backend, frontend, mobile, and QA; directed development of mobile apps with React Native for rapid cross-platform delivery; developed Molib, a cross-platform digital publishing platform; built a web-based CMS for Molib to manage digital content and interactive enrichments; integrated API strategies and Freischaltcode mechanisms to enable flexible data transfer with external systems and web shops; deployed Molib on a FINMA-certified Swiss data center with DRM and encrypted data transfer.

Team Lead at Blu bit o ADS Sofia, Bulgaria

March 1, 2015 - July 1, 2017

Designed architectures and led development for e-commerce systems using JavaScript, C#, PHP, and Java; implemented React/Ionic mobile apps and services; led teams of 6–12 across backend, full-stack, mobile, and QA; built HappyShops — a multi-shop platform for a Swiss retailer, with plug-in architecture and multi-language support; integrated multiple online shops into a unified back end as the first multi-shop provider in Switzerland; enhanced the gift and experience marketplace with high-volume product catalogs, secure payments, and improved performance to support over 200,000 customers.

Senior Web Developer & Team Lead at Various Companies (GDM FX, GOOS Web Development, ELPROM TRADE MSK, etc.)

January 1, 2002 - January 1, 2015

Held senior and lead roles across multiple companies, architecting and developing web and mobile solutions; designed SQL databases, optimized performance, and administered Linux-based servers; developed applications using JavaScript, PHP, C#, Java, Python and various frontend frameworks; managed teams ranging from 3 to 12 developers delivering projects across finance, e-commerce, and media sectors.