Lazar Milicevic · Senior Technical Engineer

I build systems that
run while you sleep.

AI automation & cloud architecture. Built for B2B SaaS companies that need it to just work — 10+ years, €30-60k saved for my current employer last year alone.

Book a Discovery Call → See My Work
10+ years · 50+ clients · Fintech · Gategroup · Hotel Kalemegdan
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Chapter 02 · The Story

The architect behind the systems

Lazar Milicevic

Professional Summary

"I bridge complex technical infrastructure and business outcomes — combining deep engineering expertise with AI-powered automation to ship solutions that actually move metrics."

Currently architecting AI-powered systems at a Fintech company. Led analytics migrations saving €30-60k annually, built serverless integrations that recovered 20-30 hours/month of engineering time, and designed global support processes from scratch.

Previously founded and operated my own IT services company serving 50+ enterprise clients. That decade of customer-facing problem-solving taught me something engineers often miss — the best technical solution is the one that solves a real business pain, not the one that looks clever in a code review.

0
Years Experience
0
Enterprise Clients
0
Cost Savings (€k)
0
% SLA Compliance
Chapter 03 · The Toolkit

Every tool, earned on real projects

Core Technical Competencies

Technical Troubleshooting 95%
Customer Success Operations 90%
Support Tools (Zendesk, etc.) 90%
Cloud Platforms (AWS, Azure) 85%
M365 Administration 85%
Python Scripting & Automation 80%
Docker & Containerization 75%

Professional Skills

Customer Success Strategy Technical Problem Solving Cloud Infrastructure Support Process Automation Cross-Functional Collaboration European-US Coverage Root Cause Analysis Technical Documentation

Technologies

AWS Azure Python Docker Git Linux Windows Server M365 Zendesk Jira REST APIs SQL PowerShell PostHog HubSpot VMware

AI & Modern Dev Tools

Claude AI Cursor IDE OpenAI API Supabase Vercel React TypeScript Next.js
Chapter 04 · The Journey

A decade of shipping systems that stick

Platform Engineer

Fintech Company

Jan 2025 - Present

  • Architected AWS Support-Zendesk integration using Lambda, API Gateway, and EventBridge, reducing manual escalation by 60%
  • Led FullStory to PostHog migration, delivering 30,000-60,000 annual cost savings
  • Defined and implemented global support process from scratch, establishing SLAs, routing logic, and cross-team workflows
  • Optimized Zendesk configuration recovering 4,000-7,000 in unused licenses annually
  • Developed Python automation scripts connecting Zendesk, Linear, Slack, and AWS services

IT Workplace L2 Engineer

Gategroup

Feb 2023 - Jan 2025

  • Provided enterprise-level technical support across global offices
  • Managed high-volume support queue maintaining 95%+ SLA compliance
  • Collaborated with international teams across US, UK, AU, and HK timezones

Senior IT Engineer

Customer Success Management Company

Jan 2022 - Jan 2023

  • Designed and implemented Microsoft Intune deployment for 70+ users including Autopilot and Defender policies
  • Deployed cloud OS deployment automation, reducing provisioning time by 50%
  • Enabled Self-Service Password Reset for entire tenant, freeing IT for complex issues
  • Created comprehensive documentation and SOPs for end-user training

Founder & CEO

LAMING (IT Services Company)

2018 - 2022

  • Founded and operated IT services company serving 50+ enterprise clients
  • Led team of 10 employees delivering network, security, and cloud solutions
  • Managed M365, Exchange, SharePoint administration for multiple organizations
  • Delivered IP video surveillance, access control, and backup system solutions

IT Support Engineer

VWG Engineering

2017 - 2019

  • Provided technical support for 200+ clients on network and computer maintenance
  • Led team of 4 engineers in field deployments
  • Designed and maintained 100+ mining systems with complex troubleshooting
Chapter 05 · The Proof

Why teams keep calling me back

What you get when you bring me onto your team

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10+ Years Proven Experience

Deep technical knowledge combined with customer-facing skills developed across enterprise environments

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Hybrid Skillset

Bridge between engineering and customer success — understand both the code and the customer pain behind the ticket

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European Timezone Advantage

Your customers get support before your US team wakes up — extended coverage without night shifts

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Cost-Effective B2B Contractor

Flexible engagement, no overhead, immediate productivity with minimal onboarding

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Automation Mindset

I reflexively ask "can this be scripted?" — proven track record of 40-90% time savings across every role

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Enterprise B2B Experience

Shipped for Fintech company, Gategroup (global airline catering), and 50+ SMB clients

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Self-Sufficient Remote Worker

Remote work veteran since before it was mainstream — requires minimal supervision, ships on deadlines

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Business-First Technical Decisions

I optimize for business outcomes first, clever architecture second — because that's what moves the needle

Chapter 06 · The Work

Hundreds of shipped projects, each one a real problem solved

Hundreds of shipped projects across SaaS, automation, and client work — here is a curated selection. Every one solved a real business problem measured in hours saved, revenue unlocked, and pain eliminated. Click any card for the full case study.

See More on GitHub →
UNA Intel automation platform Automation Live

UNA Intel — BI & Automation Platform

Founder & Full-Stack · 2025

Health food retailer's owner was burning 73+ hours/month on manual revenue tracking, invoice entry, and supplier reconciliation. Built 4-system automation ecosystem: Viber bot with Claude-powered revenue detection, Gmail invoice parser, real-time analytics dashboard, Java Swing legacy-system automation.

PythonClaude AINext.jsJava Swing
Impact: 73h/month saved · 95% automation rate · 192% Year-1 ROI
Private
Fakturko invoicing app SaaS Live

Fakturko — Invoicing SaaS for SMBs

Founder & Full-Stack · 2024

Serbian entrepreneurs lost 15+ min per invoice to manual data entry and faced tax fines from missed SEF compliance deadlines. Built OCR-powered invoicing with direct SEF/NBS API integration and offline-first Android app. 30+ customer interviews drove the spec.

PythonDockerPostgreSQLAndroid
Impact: < 2 min per invoice (vs. 15+) · zero missed tax deadlines · offline-capable
Live ↗
TechMate AI support platform SaaS Production

TechMate AI — Enterprise Support Automation

Founder & Full-Stack · 2024

Enterprise IT team drowning in repetitive tickets — 60%+ of engineer time wasted on already-solved issues, zero SLA compliance. Built local-first AI ticketing with 3-layer intelligent search: <1s indexed hits → 5-10s deep scan → human escalation. Ollama on-prem so data never leaves company hardware.

PythonNode.jsReactOllama
Impact: 60-70% tickets auto-resolved in < 1s · 3x volume, same headcount · first-ever SLA compliance
Private
Hotel Kalemegdan Client Work Live

Hotel Kalemegdan — Smart Hotel Automation

Full-Stack & IoT · 2023

Boutique hotel in central Belgrade needed to eliminate 24/7 front desk staffing costs without sacrificing guest experience. Built end-to-end system: booking + payment + auto-generated access codes + on-premise Linux server driving Sonoff smart switches that control electric door strikes. Fully touchless check-in.

Linux ServerSonoff IoTPayment APISmart Locks
Impact: 24/7 front desk eliminated · touchless check-in · codes valid per-stay, per-room
Private
KP
SaaS Live

KnjigoPis AI — AI Assistant for Bookkeepers

Founder & Full-Stack · 2025

Serbian bookkeepers manage 8+ email inboxes, lose 4 hours/day to manual triage, and miss 13+ seasonal tax deadlines yearly. Built multi-inbox AI aggregator with hybrid RAG (full-text + pgvector) over 150k legal articles, auto-triage, and cron deadline reminders pushed to each firm's clients 2 days ahead.

Next.js 14SupabaseClaude APIpgvector
Impact: 99.5% token cost margin (500k tokens/mo cached) · first paying client Q2 2026
Request Demo
PP
SaaS MVP

PravoPis AI — Legal Assistant for Lawyers

Founder & Full-Stack · 2025

Serbian attorneys burn 3+ hours/day on case research, deadline math, and boilerplate docs — no integrated workspace existed. Built full legal OS with hybrid RRF search over 150k articles + precedents, 8 auto-filled document templates, 23 AI tools (fee calc, deadline generator, precedent lookup), and 6-wing MemPalace AI memory.

Next.js 14SupabaseMiniMax-M2pgvector
Impact: 2 hours → 8 min per filing · 6 modules eliminate context-switching · 99.3% margin at €200 tier
Request Demo
K
SaaS Live

Kinto — Currency Exchange SaaS

Founder & Full-Stack · 2025

Serbian menjačnice manually tracked TMIS submissions, daily cash reconciliation, and multi-branch reporting — no offline-first tool existed for field workers. Built PWA + native Android hybrid with Capacitor, Zustand state, SQLite offline sync, FCM push, and per-location real-time widgets.

Next.js 14PrismaCapacitor 6PostgreSQL
Impact: 2h EOD reporting → real-time · offline resilience eliminates lost TMIS submissions · Android + PWA from one code base
Request Demo
AR
SaaS MVP

ArcReactor — AI-Powered PM Dashboard

Founder & Full-Stack · 2026

Engineering teams lose 10+ min per standup to status rollups across Jira, GitHub, Slack, and spreadsheets. Built single-pane dashboard with real-time Supabase streams, Recharts drill-down, Howler audio alerts for SLA breaches, and Zustand state syncing across tabs. Modular widget system per team.

Next.js 16React 19ZustandSupabase
Impact: 5-7 min cut per standup · audio alerts catch SLA breaches in 2s · interactive drill-down, no page reloads
Request Demo
Stylera salon booking SaaS Live

Stylera — Salon Booking SaaS

Founder & Full-Stack · 2024

Beauty salons lose revenue to no-shows and unfilled slots — staff can't manually phone waitlisted clients fast enough. Built intelligent waitlist auto-notifier with Resend API real-time emails, 24h reminders, and dynamic last-minute discounts. Apple-inspired UI built for non-technical salon owners.

ReactTypeScriptSupabaseResend API
Impact: +20% appointment fill rate · fewer no-shows via auto-reminders · competitive with Booksy/Fresha locally
Request Demo
Marketing Automation Suite Automation Production

Marketing Suite — AI Workflow Engine

Automation & AI · 2023

Agency with 50+ clients lost 60%+ of team time to reading emails, drafting ad copy, creating Asana tasks, and routing orders. Built Python workflow engine that monitors Gmail, drafts ad copy via GPT, auto-creates Asana tasks with context, and logs everything. Runs 24/7 on VMware with auto-retry on failure.

PythonOpenAI GPTGmail APIAsana API
Impact: -90% manual admin work · response in minutes not hours · 2x client capacity, same team
Private
AWS Support Integration Enterprise Production

AWS Support Integration (Zendesk ⇄ AWS)

Platform Engineer · 2025

Engineers wasted hours manually mirroring tickets between Zendesk and AWS Support — copy-paste between two systems, missed SLAs, frustrated end users. Built serverless integration (Lambda + API Gateway + EventBridge) with bidirectional real-time sync and severity-based routing. First-ever SLA compliance achieved.

AWS LambdaAPI GatewayEventBridgePython
Impact: 20-30 hours/month recovered · -60% manual escalation · first-ever SLA compliance on AWS cases
Private
B
Automation Production

BizFlowAI — B2B Lead Generator

Automation Developer · 2024

Sales team lost hours daily to manual prospecting, lead enrichment, and copy-paste CRM data entry — quality leads slipped through the cracks. Built Python lead-gen pipeline with proxy rotation, smart retry, HubSpot push, and automated Mailchimp drip sequences. Team went from hunting to closing.

PythonHubSpot APIMailchimpProxy Rotation
Impact: 100,000+ qualified contacts/month · zero manual data entry · sales team focuses on closing
Private
H5
Automation Phase 1

Harpoon500 — Fortune 500 Cold Outreach

Founder & Full-Stack · 2026

B2B SDRs hit 85%+ rejection rate on LLM-generated outreach — corporate spam filters + AI detection = Gmail bans within weeks. Built 100%-local SQLite + Next.js pipeline with Claude Opus 4.6 generation, warm-up ramp (5→20/day), pixel tracking, reply sentiment polling, and human-pass filter to dodge AI detection.

Next.js 14SQLiteClaude OpusGmail OAuth
Impact: 3+ week ban-free deliverability · open-rate tracking in 10s · fully-local (zero cloud log leaks)
Request Demo
NVR
Automation Production

NVR Monitoring — Real-Time Security Alerts

Security Automation · 2023

Company's network-accessible NVR surveillance had zero visibility into who accessed footage or when — no audit trail, no breach detection. Built Python monitoring daemon that tails NVR auth logs, detects new logins in real-time, and pushes alerts to Telegram with timestamp, user, and IP. Blind spot → full visibility.

PythonTelegram Bot APIRESTLog Tail
Impact: Real-time unauthorized access alerts · complete audit trail · zero blind spots
Private
HK
Client Work Live

Hotel Karadjordjeva — Luxury Booking Site

Web Developer · 2025

Boutique luxury hotel lost bookings at the last step — customers couldn't visualize romantic experience or trust pricing without friction-heavy external forms. Built React SPA with real-time price calculator, parallax 3D card-flip apartments, canvas rose-petal particle system, and exit-intent newsletter capture.

React 18ViteCanvas APILeaflet
Impact: Estimated +35% conversion from friction-free booking · storytelling increases dwell time · multi-language SEO
Request Demo
CS
Client Work Live

CigarShop Belgrade — Cinematic Brand Site

Web Developer · 2025

Premium cigar retailer (9 locations) was competing on price, not craft — customers didn't understand terroir or ritual value. Built zero-framework cinematic experience: 3D hero cigar with real-time smoke/ember, interactive tobacco-origin globe, Three.js humidor walkthrough, GSAP scroll-triggered reveals, Howler ambient audio.

Three.jsGSAPLenisVanilla JS
Impact: 3x dwell time via scroll narrative · +60% Instagram shares (est.) · justifies 40% price premium
Request Demo
PT
Client Work Live

Predator Laser Tag — Arena Marketing Site

Web Developer · 2025

Laser tag arena struggled to fill weekend slots and differentiate tier pricing (birthday parties vs. team-building). Competitors had static image sites. Built cinematic landing page: hero video + Three.js particles, 300m² arena stats counter, scan-line overlay, typewriter tagline, pulse-glow CTAs, laser-beam gallery animations.

Three.jsGSAPViteCanvas
Impact: Estimated +45% bookings via video proof-of-scale · +28% CTR from animated CTAs · "high-tech" positioning
Request Demo
UNA Zdrava Hrana website Client Work Live

UNA Zdrava Hrana — Retail Website

Web Developer · 2024

Local health food store (15+ years in business) had zero online presence and couldn't compete with e-commerce platforms — customers had no way to learn about products or contact them before visiting. Built responsive Next.js site with product catalog, history section, Google Maps, and full SEO optimization.

Next.js 14TypeScriptTailwindCSSFramer Motion
Impact: 138KB First Load JS · automated Vercel deploys · modern digital presence unlocks new channels
Request Demo
Tempo Transport website Client Work Live

Zdravković i Sinovi — Transport Company

Web Developer · 2024

Transport company (5+ years, 2000+ clients) lost potential bookings — no online presence meant customers couldn't verify credibility or request quotes. Built dark-themed responsive Next.js site with three service categories (Transport/Moving/Delivery), testimonials, photo gallery, and prominent quote CTAs.

Next.js 14TailwindCSS 3Framer MotionVercel
Impact: Quote requests now digital · builds credibility for non-repeat customers · auto-deployed on Vercel
Request Demo
DV
Client Work Live

David Vazić — Developer Portfolio

Web Developer · 2025

Junior JavaScript developer needed professional online presence — no portfolio meant invisibility in competitive job market. Built responsive Next.js site with animated skills showcase (progress bars), detailed BizFlowAI work experience section, and contact form. Smooth Framer Motion polish creates senior impression.

Next.js 14TypeScriptTailwindCSSFramer Motion
Impact: Professional presence unlocks job market · senior visual impression on junior budget
Live ↗
NW
Enterprise Production

Notion Task Widget — Native Android

Mobile Developer · 2024

Power users manage tasks in Notion but lose productivity to context-switching — missed urgent items, zero home-screen visibility. Built native Android widget that fetches uncompleted tasks via WorkManager every 15 min, shows priority color pills + relative due dates, stores API token in encrypted SharedPreferences. 1.5MB APK.

Kotlin 1.9Retrofit 2WorkManagerNotion API
Impact: Zero context-switch friction · 2-tap task completion from home screen · estimated +30% productivity for task-heavy flows
Request APK
Chapter 07 · The Transforms

Chaos in, order out

Analytics Migration: FullStory to PostHog

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Challenge

Company was paying premium rates for FullStory with incomplete user tracking. Historical session data needed to be preserved during migration.

Approach

Systematically debugged two analytics engines in parallel. Analyzed .jsonl event structures, resolved AWS IAM permissions, and coordinated directly with both FullStory and PostHog support teams.

Solution

Developed custom import pipeline for historical data, created comprehensive event schema mapping, and prepared technical documentation for license termination.

Result

Successfully migrated with zero data loss. Annual savings of 30,000-60,000. Product team gained more precise and stable analytics.

Network Crisis: 100+ Employee Company Offline

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Challenge

Nation's largest computer equipment seller experiencing complete network failure across 500+ devices. Daily financial losses mounting with dissatisfied customers nationwide.

Approach

Conducted comprehensive network diagnostics. Systematically identified root cause through protocol analysis and device mapping.

Solution

Discovered multiple routers with DHCP enabled causing IP conflicts. Removed redundant routers, replaced with switches, cleaned inactive reservations, and established proper IP management for critical systems.

Result

Restored full network operations within hours. Company avoided significant financial losses and maintained customer trust.

Zendesk-Linear-Slack Automation Pipeline

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Challenge

Critical tickets were falling between systems. IT team used Slack while Support used Zendesk, causing delays and lost tasks.

Approach

Designed unified workflow connecting all three platforms. Mapped ticket lifecycles and identified automation opportunities.

Solution

Built Python automation that reads critical Zendesk tickets, creates Linear tasks automatically, sends Slack notifications, and tracks progress to closure.

Result

40-60% faster incident resolution. Eliminated lost tasks and reduced manual work across multiple teams. Clear ownership established.

Government API Integration (SEF/NBS)

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Challenge

Serbian government tax system API (SEF) had minimal documentation, required cryptographic signatures, and experienced unpredictable downtime with cryptic error messages.

Approach

Reverse-engineered existing integrations. Built comprehensive test harness. Implemented detailed logging to track failure patterns.

Solution

Created queue-based retry system with exponential backoff. Added daily NBS exchange rate fetching with caching. Designed graceful degradation with manual fallback.

Result

95%+ automated submission success rate. Users maintain compliance automatically without fines. System handles edge cases gracefully.

Chapter 08 · The Craft

Formal education & relentless self-study

BSc

Computer Engineering

University "Dositej" - Belgrade

240 ECTS Credits

AI

CS50's AI with Python

Harvard University

Artificial Intelligence & Machine Learning

JS

JavaScript Programming

Qubes IT School

Full Course Completion

ENT

Digital Entrepreneurship

MasterBox - 2022

Business & Technology

Continuous Learning: Self-directed professional development in cloud technologies, automation frameworks, and customer success best practices through practical projects, vendor documentation, and industry resources.

Chapter 09 · The Signal

Let's build something that runs while you sleep

Ready to bring technical excellence and cloud automation expertise to your team. I'm available for remote work and excited to build innovative solutions.

Available for Part-Time or Full-Time Remote Work
lamingsrb@gmail.com +381 64 121 32 92 LinkedIn GitHub

Typically responds within 24 hours