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Nikola Mihailovic

@nikolamihailovic

Senior Back-end Engineer at VET7.well who modernized a live platform with BFF architecture and gradual migration.

Serbia
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At VET7.well, I modernized a live veterinary healthcare platform across Yii2 and Laravel without a rewrite or interruption to operations. I designed its Backend-for-Frontend architecture and strangler migration strategy so new services could coexist with the legacy platform.

At Proxify, I developed and maintained internal platforms with Laravel, Vue.js, TypeScript, MySQL, and Redis. I also designed scalable APIs and asynchronous, event-driven workflows, contributing to system design and technical direction across interconnected platforms.

At Vega IT, I led development teams delivering SaaS products and high-traffic web applications. I built and optimized Laravel applications handling millions of requests and large volumes of transactional data, including Stripe payment and billing integrations with strict correctness requirements.

For Howden Group, I built a fully automated underwriting and risk-assessment platform for a regulated, audit-heavy domain, reducing manual processing effort by more than 60%. Across my work, I’ve focused on distributed systems, payment correctness, and practical architecture decisions; I also use Claude Code in my daily development workflow.

Experience

Work history, roles, and key accomplishments

VE

Senior Software Engineer

VET7.well

Dec 2025 - Aug 2026 (8 months)

Led modernization of a large-scale veterinary healthcare platform across Yii2, Laravel, and Vue 3, improving a live production system incrementally with no rewrite and uninterrupted operations. Designed a Backend-for-Frontend (BFF) architecture and strangler migration strategy, and configured Nginx reverse-proxy and gateway routing.

PR

Senior Software Engineer

Proxify

May 2023 - Nov 2025 (2 years 6 months)

Developed and maintained large-scale internal platforms (Member, Client, and ATS) using Laravel, Vue.js, TypeScript, MySQL, and Redis, alongside Node.js/TypeScript services. Designed scalable APIs and event-driven asynchronous workflows, and led technical discussions, code reviews, and mentoring across distributed teams.

VI

Senior Software Engineer / Team Lead

Vega IT

Nov 2020 - May 2023 (2 years 6 months)

Led development teams delivering enterprise-grade SaaS products and high-traffic web applications, providing architectural guidance and code review across PHP and Node.js codebases. Built and optimized Laravel applications processing millions of requests and large volumes of transactional data, including Stripe-based payment and billing integrations.

DG

Senior Software Engineer

Devtech Group

Feb 2020 - Nov 2020 (9 months)

Built enterprise-grade backend services and APIs (Laravel, PHP, Vue.js) and optimized database performance through SQL tuning, indexing, and caching. Delivered scalable SaaS features within Agile teams.

BL

Software Engineer

Bridgewater Labs

Jan 2019 - Jan 2020 (1 year)

Built backend services, APIs, and Stripe payment integrations for enterprise clients across North America. Improved platform scalability through database optimization and architectural enhancements.

FL

Software Engineer

fSD Ltd

Aug 2018 - Jan 2019 (5 months)

Developed ERP and CMS modules (Symfony, PHP, JavaScript, MySQL) and improved performance, user experience, and operational stability across business systems.

ND

Software Engineer

No Solutions Development

Mar 2016 - Aug 2018 (2 years 5 months)

Delivered 15 client projects including custom web applications, APIs, and Stripe payment integrations. Designed and optimized relational databases and business workflows while meeting quality and delivery commitments.

SE

Freelance Web Developer

Self-employed

Mar 2014 - Mar 2016 (2 years)

Built custom websites and web applications for small businesses and agencies (PHP, JavaScript, MySQL), including database design, CMS solutions, hosting and deployment. Worked directly with clients on requirements, estimates, and delivery.

Education

Degrees, certifications, and relevant coursework

GE

Global Dev Experts

Global Architecture Course, Software Architecture

Completed a Global Architecture Course covering software architecture, distributed systems, DDD, event-driven system design with Kafka-based patterns, and architectural decision-making.

VS

Viša Tehnička škola u Novom Sadu

BSc, Web Design

2013 - 2016

Earned a BSc in Web Design from Viša Tehnička škola u Novom Sadu from 2013 to 2016.

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