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lazarbukejlovic/README.md

Hi, I'm Lazar

Lead Full-Stack Engineer with 4 years building production React/TypeScript web apps for fintech, SaaS, and data-heavy products — including AI-powered SaaS built end-to-end on Next.js and the Anthropic API.

I take features from unclear requirements all the way through UI, backend logic, auth, Stripe billing, deployment, and QA — without leaving the hard parts to someone else. Known for ownership-driven execution, product thinking, and clean implementation that ships web applications which feel polished, reliable, and ready for real users.

Currently building at TokenFlow.

Experience

TokenFlow — Lead Full-Stack Engineer · January 2025 – Present

React/TypeScript product engineering across 3+ concurrent client workstreams, owning features end-to-end from requirements and UI through backend logic, deployment, and post-launch QA. Focused on the parts that quietly break in production — payments, auth, and data integrity.

  • Built Stripe billing and Supabase/Postgres auth + session flows, with typed API contracts and webhook idempotency to eliminate duplicate-charge and subscription-sync bugs at the source.
  • Wrote Jest suites around the auth, payment, and saved-data paths most prone to silent regressions — ~85% coverage on critical paths, so releases ship without repeated manual re-checking.
  • Standardized Docker-based local and staging environments, ending "works on my machine" as a recurring team failure mode.

Stack: React · TypeScript · Node.js · Supabase · PostgreSQL · Stripe · Jest · Docker


ScaleRoad LLC — Full-Stack Software Engineer · December 2023 – January 2025

Built operational dashboards and internal tooling in React/TypeScript/Node/PostgreSQL for records, payments, subscriptions, and status tracking — serving ~10,000 monthly active users under real production load.

  • Defined strict API contracts and cached heavy dashboard queries to keep latency-sensitive views responsive at scale.
  • Cut perceived load time on data-heavy views through state-management cleanup and route-level lazy-loading.
  • Took features from undefined idea to shipped product: scoping, flow design, backend wiring, edge-case handling, and deployment under tight deadlines.

Stack: React · TypeScript · Node.js · PostgreSQL · REST APIs


Vertex Digital Studio — Full-Stack Engineer (Contract / Remote) · June 2022 – December 2023

Delivered 15+ custom web applications for fintech, SaaS, and data-heavy clients, turning business workflows into authenticated dashboards, CRUD tools, and payment flows — owning each project independently from scope to client handoff.

  • Designed secure auth flows, relational data models, and REST APIs across a high volume of distinct client projects.
  • Cut new-project setup time ~50% by building a 30+ component reusable React/TypeScript library used across client work.

Stack: React · TypeScript · Node.js · REST APIs · Stripe

Tech Stack

  • TypeScript
  • JavaScript
  • React
  • Next.js
  • Node.js
  • Express
  • PostgreSQL
  • Supabase
  • Prisma
  • Tailwind CSS
  • Stripe API
  • Auth0
  • Docker
  • GitHub Actions
  • Vercel
  • Jest
  • Cypress
  • Product Systems
  • UI / UX Thinking
  • Real-Time Interaction
  • Full-Stack Product Delivery

Selected Work

Professional portfolio and visual resume site presenting my full-stack engineering profile, selected projects, live demos, contact flow, and resume integration.

Market-ready competitive-intelligence platform for tracking competitor pricing pages, changelogs, news, and hiring pages. Sightline detects meaningful changes, stores snapshots, summarizes impact with AI, shows confidence and cited evidence, supports Ask/RAG answers, scheduled digests, review queues, Stripe billing, AI usage analytics, audit logs, and real-time collaborative battlecards.

MindPad AI is a productivity tool designed to minimize the "mental overhead" of task management. Instead of requiring users to manually format, categorize, and prioritize tasks in a traditional Kanban board or list, the app functions as a "capture-and-transform" engine.

AI SaaS workspace that turns messy meeting transcripts into decisions, owners, risks, follow-ups, and execution boards. Built with Next.js, React, TypeScript, Tailwind CSS, Framer Motion, Clerk, Prisma, and Vercel, with a cinematic product interface and interactive Flow assistant auth experience.

Full-stack destination intelligence platform for trip readiness, long-stay planning, watchlists, alerts, reports, Stripe billing, and Supabase-backed user data.

Geopolitical risk intelligence dashboard for conflict monitoring, market impact analysis, historical context, and simulated humanitarian relief tracking.

Led collaborative full-stack product build for developer growth workflows, creator tooling, and structured educational delivery.

Social/developer conversation platform concept with feed interactions, messaging flows, discovery, live activity sections, and responsive product UI.

SaaS/workspace product with protected admin-style flows, product management UX, Stripe checkout positioning, and polished dashboard structure.

Booking and reservation platform centered on service scheduling, payment-oriented flows, customer-facing booking UX, and polished product presentation.

Business operations dashboard for managing clients, projects, invoices, deadlines, workflow visibility, and structured client-side operations.

Workflow and task management product built around boards, rooms, activity tracking, operational visibility, and SaaS-style product structure.

Pinned Loading

  1. personal-website personal-website Public

    Architected premium engineering profile site integrating resume delivery, booking flow, and curated product showcase.

    TypeScript 1

  2. mindpad-ai mindpad-ai Public

    Full-stack AI productivity SaaS with MongoDB, Stripe subscriptions, Google OAuth, task extraction, focus planning, analytics, and team workspaces.

    TypeScript

  3. atlasbrief atlasbrief Public

    Production-ready travel-readiness platform for checking destination fit, cost, risk signals, and what changed before booking.

    TypeScript

  4. georisk-platform georisk-platform Public

    Geopolitical risk intelligence platform with conflict monitoring, market impact analysis, historical context, and simulated humanitarian relief tracking.

    TypeScript 1

  5. echo-room echo-room Public

    Designed social communication product with feed interaction, messaging workflows, and real-time discussion systems.

    TypeScript 1

  6. flowstate flowstate Public

    AI meeting-to-delivery workspace that turns messy transcripts into decisions, owners, risks, follow-ups, and execution boards.

    TypeScript 1