I'm Nikolay Petkov, a Senior Full Stack Developer who built and scaled a fintech platform from pre-seed to Series B, culminating in an acquisition. I own end-to-end system design, cloud infrastructure, and production reliability, with 10+ years of experience across TypeScript, React, Node.js, and AWS. I thrive on shipping robust features, leading cross-functional teams, and obsessing over data integrity and fault tolerance. I enjoy mentoring junior engineers and designing resilient architectures that scale to tens of millions of dollars in transactions and 24/7 operations.

Nikolay Petkov

I'm Nikolay Petkov, a Senior Full Stack Developer who built and scaled a fintech platform from pre-seed to Series B, culminating in an acquisition. I own end-to-end system design, cloud infrastructure, and production reliability, with 10+ years of experience across TypeScript, React, Node.js, and AWS. I thrive on shipping robust features, leading cross-functional teams, and obsessing over data integrity and fault tolerance. I enjoy mentoring junior engineers and designing resilient architectures that scale to tens of millions of dollars in transactions and 24/7 operations.

Available to hire

I’m Nikolay Petkov, a Senior Full Stack Developer who built and scaled a fintech platform from pre-seed to Series B, culminating in an acquisition. I own end-to-end system design, cloud infrastructure, and production reliability, with 10+ years of experience across TypeScript, React, Node.js, and AWS.

I thrive on shipping robust features, leading cross-functional teams, and obsessing over data integrity and fault tolerance. I enjoy mentoring junior engineers and designing resilient architectures that scale to tens of millions of dollars in transactions and 24/7 operations.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
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Language

Bulgarian
Fluent
English
Advanced
German
Beginner

Work Experience

Senior Full Stack Developer at Candor
September 1, 2021 - Present
Owned end-to-end delivery of core platform features, including system design, API contracts, implementation, cloud deployment, and long-term maintenance. Built a highly available trading platform handling $50M+ in transactions with strong production reliability. Migrated AWS infrastructure to Infrastructure as Code using CloudFormation, improving deployment reliability and disaster recovery. Served as on-call engineer on a rotating basis and drove post-incident improvements.
Senior Full Stack Developer at Independent / Freelance
August 1, 2018 - September 1, 2021
Contributed to multiple client projects across fintech, automotive, and cybersecurity domains, progressing from feature implementation to technical leadership; led architecture discussions and mentored junior developers.
Front-end / Full Stack Developer at Self-employed (Sofia)
November 1, 2016 - August 1, 2018
Frontend/Full Stack role contributing to a customizable frontend platform deployed across 10+ international markets; led frontend feature development and performance optimizations.
QA Engineer
May 1, 2015 - August 1, 2016
Contributed to QA team growth (2 → 10+ engineers) by training new testers and standardizing testing workflows for the studio's first major release.

Education

BA at New Bulgarian University, Sofia
January 11, 2030 - February 10, 2026

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Financial Services, Professional Services, Media & Entertainment, Other