01 · Founder and sole developer
AirPosture
Your AirPods are a posture sensor.
- 5,000+ people use it
- Paying subscribers in several countries
- iPhone, Apple Watch and Mac, offline-first
Production AI agents · Belgrade
AI Engineer
My AI agents have moved $3.2M of real money, without a single wrong transfer. I build AI agents that handle real money and real customers, with approval before anything moves, a record of every action and a hard ceiling on cost.
- $3.2M moved · zero errors
- ★5.0 from every rated client
- 100% Job Success
- Top Rated on Upwork
- 10 apps on the App Store
- B.Eng. Software Engineering
After hours · founder
I run two startups of my own.
AirPosture and Vael, built and run alone with my own AI agents. Ten apps of mine on the App Store in all.
Client result$14,200 a month saved for a 42-truck carrier
Most AI tools look great in a demo and break with real customers. I build the part after the demo: a person approves before money moves, every action is recorded, every update is tested, and costs have a hard limit.
01 · AI systems
My work.
Eight AI systems I designed and built myself, end to end. Here is what each one does.
Results from AI systems I built
What it saved them.
Founders and owners I built AI systems for, directly, outside Upwork. In their own words.
AI back office for a 42-truck carrier
$14,200
saved every month
“Relja's agents took over the paperwork and check calls that used to eat two people's days, and the detention we never billed now comes back every month. He builds fast, explains everything in plain words, and he is still the first person I call.”
Mark Delaney
Owner, Delaney Freight Lines
as a developer
AI lead research and outreach
$9,800
saved every month, 70% lower cost per lead
“DeepLead replaced the research our team did by hand. We get more qualified leads for a fraction of the cost. As a developer Relja is rare: he thinks like a founder, plans everything up front and ships exactly what he promised, on time.”
Daniel Reyes
Founder, DeepLead
as a developer
VoiceVault, a voice assistant for her team
11 hours
saved every week, per person
“I had the idea for years and Relja is the one who made it real. Now my whole workday runs by voice: notes, follow-ups, tasks, even the boring admin I used to put off. He took my rough vision, turned it into something better than I imagined, and was there for every question along the way.”
Elena Marković
Founder, Notely Studio
as a developer
Client reviews
5.0
Every client who rated me on Upwork gave five stars. Quoted word for word.
Top Rated
Upwork badge
100%
Job Success
14
contracts
6 clients left a rating, and every rating is 5.0.
See every review on Upwork ↗Founder
Two startupsI founded and run.
AirPosture and Vael are mine end to end: product, design, code, servers and the App Store. I run both with the same AI agent workspace I bring to client work, so you hire someone who already knows what real users, payments and App Store reviews do to software. See the workspace
02 · Founder and sole developer
Vael
Your wardrobe, styled by AI.
- AI tags every garment and plans outfits around your weather
- iOS, web and a Chrome extension on one backend
- 514 commits, 33 Edge Functions, 128 database migrations
Plus eight more apps of my own on the App Store, further down the page.
Security · after launch
I don’t ship itand disappear.
I run the servers behind everything I build: security, updates, backups and monitoring. Including a trucking dispatch platform I sold, which I still keep secure today.
5,000+
people on AirPosture, on servers I run
99.98%
uptime, last 12 months
0
data breaches, ever
3 yrs
still securing a platform I sold
Systems I run
All systems operationalAirPosture API
99.99%
Dispatch platform
99.97%
LaunchPilot
99.98%
VoiceVault
100%
45 days ago90 days agotoday
- Blocked 1,284 login attempts from one network2h ago
- Backup restored to a test server: passedOct 20
- Security patches applied to 6 serversOct 18
I attack it before anyone else does
Before every release I test my own systems the way an attacker would: logins, payments, file uploads, every open door.
Locked-down servers
Keys instead of passwords, closed ports, security patches applied automatically, and secrets kept out of the code.
Data encrypted, backups proven
Customer data is encrypted at rest and in transit. Backups are restored on a schedule, so I know they work.
Watched around the clock
Monitoring and alerts on every server. If something breaks at 3 a.m., I know before your customers do.
How fast
Fast,with receipts.
Straight from my git history, October 2025 to October 2026. The pace, not my word for it.
1,715
commits in 12 months
233
days with shipped work
27
repositories
39 days
longest streak
Every day of the last year
busiest day: 112 commits
Hover a dayLessMore
Idea to working system
first to last commit in each repository
Night shift
Belgrade, after hours. The agents run, I review what they want to do.
Inside the system.
Also · iOS Apps
Shipped to theApp Store, solo.
Let's buildthe part afterthe demo.
Relja Bulajić
AI Engineer, Belgrade · founder of AirPosture and Vael
B.Eng. in Software Engineering