A clear offer, not a louder button
Conversion rate optimization starts with what you are actually asking for and why anyone should say yes. That moves more than color tests ever will.
CRO
Conversion rate optimization consultant for sites that get traffic and still miss the sale.
Conversion rate optimization consultant work starts with the offer and the page job, then I change the page. If the offer is unclear or the website redesign never defined a job for each URL, tests will not save it.
Remote for US, UK, and EU teams · 80+ five-star reviews · 100% Upwork Job Success
Zlatko MarjanovicDigital strategist & creative directorBrand Collaborations
7+Years optimizing marketing sites
120+Pages designed and shipped
1stOffer and page job, before A/B tests
100%Upwork job success score
What you get
What changes when this is done right.
Three outcomes I hold myself to before anything ships. If these are not the job, this is the wrong page.
Pages with one obvious next step
Every key page gets a single job and a clean path to it. Landing page optimization means removing friction, not adding widgets.
Spend that finally pays off
If you are buying traffic, weak pages waste it. CRO makes the ad and SEO spend you already have actually convert.
The engagement
What this work actually covers.
Scope first, so you know what you are buying and what stays out.
What I fix first
The offer, the page job, the path from landing page to form, and the proof that should sit next to the ask. Landing page design and conversion-focused UX come after that, not before.
Where this usually shows up
SaaS marketing websites, service sites, and landing pages that look finished and convert poorly. Growth marketing spend makes the problem more expensive. Conversion rate optimization makes the spend useful.
How it ties to the rest of the site
I can run this as a standalone CRO pass or as part of a website redesign. Same person, same commercial standard. No separate team that never saw the build.
What is conversion rate optimization
Conversion rate optimization is the work of turning existing traffic into more calls, demos, or checkouts without buying more clicks. On a marketing site that usually means a clearer offer, one job per page, less form friction, and proof next to the ask. Landing page optimization is the same job on paid and campaign URLs. Tools and heatmaps help after that, they do not replace it.
CRO consultant versus a conversion rate optimization agency
A conversion rate optimization agency often sells a testing calendar and a dashboard. A conversion rate optimization consultant who also designs and builds pages can fix the path this week. Conversion rate optimization services here are an audit, a rewrite of the offer, a rebuilt landing path, and tests only when traffic can support them.
How it works
A sequence, not a scramble.
Same order every time. Discovery, the plan, the build, then the check after launch.
Diagnose the drop-off
I map where visitors actually leave: the offer, the page structure, the form, or the proof that is missing next to the ask.
Days 1-3Drop-off map on the key pages
Fix the offer and the page job
Before any test, the page gets one clear job and a reason to act. This is where most of the conversion lift comes from.
Days 4-7Rewritten offer and a single CTA
Rebuild the path
Landing page design and conversion-focused UX get rebuilt around that job, with friction removed from the path to the form.
Week 2-3Rebuilt landing path and form
Test what is worth testing
When traffic supports it, I run A/B tests on the decisions that matter, not button colors on a page that was broken to begin with.
After traffic can support itA/B plan on the decisions that matter
What clients say
Every review is public and verifiable on
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Zlatko is a PRO! Something I was struggling with for months, took him only a few days. I think I it wasn't for the Christmas holidays, he probably could have completed it with me during our consultation call. He knows how to operate the back end of a website, he understands coding and connection. He is just a life saver and has saved me valuable time. I'll 100% will be working with him as I continue to build my tech business. I recommend him, but be easy on him. I still need him to be available to help me. You can't lose when working with Zlatko! He's excellent!
Meesha Lewis
CEO & Founder at ManeXperience
Working with Zlatko has been nothing but exceptional. From the speed of his work to his deep knowledge of code, the entire process was a pleasure, and I'm very happy with my improved website. Zlatko was responsive, knowledgeable, and willing to go back and forth with me on even the smallest details. He also sent a very detailed video addressing all of my questions and concerns, which I can refer back to for any future updates. I'm very glad I chose Zlatko and would highly recommend him.
Minka Djurasevic
Senior Graphic Designer
Great experience working with Zlatko! He did a great job creating our press sites and delivered a professional, well-structured result that matched what we needed. Communication was smooth throughout the project. Highly recommended and we would happily work with him again!
Hintsteiner Group GmbH
Austria
Very happy with the project and Zlatko's work. I didn't think it was possible but he took my site from a 43 to a 96 score on Lighthouse for page speed and load times. Will definitely be a repeat customer.
Lance Parth
Triton Sensors
Zlatko did a very good job making a new website for my clinic. It looks very professional and streamlined, and I am looking forward to optimizing it for SEO performance. There was a little bit of delay due to some unforeseen issues on his end, but he was communicative and let me know what's going on. I would definitely use him again in the future if needed.
Dr. Farhan Abdullah
CEO at Magnolia Functional Wellness
Zlatko did excellent work on my site. He significantly improved PageSpeed performance, rebuilt a problematic popup natively, and refined the mobile experience so the site is now much smoother and easier to navigate. Communication was clear and professional throughout, and he was thoughtful in addressing both technical performance and real user experience.
Sagel
Yoga and Meditation with Sagel
Zlatko is the real deal. A REAL web developer who builds professional components, structure, and websites. He absolutely knows what he's doing and is the most professional web builder I've worked with on this platform. I will 100% hire him again and again. He's my go-to guy now. Absolutely knocked it out of the park on an insane deadline with a heavily animated and polished build.
Adam
Polyform Studio
The best web developer you could ever ask for, he did an amazing job with our website and we will be working with him in the future for more projects. We are extremely satisfied with his work and the end result. Highly recommend you Zlatko for any high end website needs.
Alexander Karima
Co-founder at Mavesta Media
Zlatko did such an amazing job fixing up my site. He is always fast and responsive and delivers high-quality work. Will definitely come back again. Highly recommend.
Dana Yao
Senior Product Designer at Visa Inc.
Zlatko is very experienced, able to communicate clearly and efficiently and able to work very fast while still delivering quality work. He's an amazing web designer and I will definitely be back for future work and refer close friends to his offer.
Astral Labs Agency
Independent Employer
Zlatko has been a pleasure to work with. He is extremely professional, proficient and articulate. He met our tight deadline and was incredibly patient with our changes. Looking forward to working with him in the future.
Matthew John S
CEO at Gsshades
Zlatko exceeded in every possible way. Excellent communicator, very speedy in response and proactively thinking with me to get the most out of my website and setup. He is a gem!
Desiree Kolman
Personal Website Build
Zlatko was extraordinarily ADEPT, EFFICIENT and provided amazingly high quality in his work. Would HIGHLY recommend him!
Nick Maciel
Founder at Cadversity
Zlatko is hard-working and proactive, with excellent communication skills and a keen eye for detail. We engaged Zlatko to help with a broad range of tasks with quite a short turnaround, and we couldn't be happier with his results. I highly recommend his services and would not hesitate to work with him again in the future.
Thom Vaughan
Manager at Common Crawl
Zlatko was incredible to work with, he helped spin up our website in less than two days and responded within minutes to all of my requests. Can't thank him enough, will use him again for many other projects moving forward. My second time working with him in 2 weeks and he's completely exceeded expectations yet again.
Marina Paganessi
Co-Founder at Focus&Film
Zlatko was a dream to work with and we would 100% work with him again!
Dominique De Leon
Independent Employer
Great job. Did a comprehensive overhaul of our entire site and got us to move off SquareSpace. Very collaborative and consultative, which was very helpful.
Seth Meritt
CEO at Welby Health
Zlatko is a true pro. His knowledge of web development is tremendous, and he is very committed to ensuring everything works to your satisfaction before delivery. I will continue to be using Zlatko for any updates to my website, and cannot recommend his services enough!
Zach Garti
Founder of Pareidolia
Our website allows us to deliver our vision, impact, and connect with our existing and future community around the world. Thanks to Zlatko's skillsets and laser-focused diligence, it speaks to our audience, inspires others to take action, and transmits the energy of our work with young founders.
Filip Sasic
CEO & Founder at EGC
I had the pleasure of working with Z on a project, and I couldn't be more impressed with the results. His communication is exceptional, clear, prompt, and always professional. Z truly understands client needs and goes above and beyond to ensure satisfaction. I look forward to collaborating with him on future projects.
Jordan W. Bryant
Chair & CEO, Vault Apps
Zlatko was incredible. He worked diligently under a deadline, gave incredible insights and was able to work on his own and bring massive value to the project. It was a pleasure working with him on this project and will be working with him again in the future. Best web person I've worked with on this platform, by far.
Marshall Wilkinson
CEO, Construct
He did a great job and completed the website very quickly. Excellent designer and good communicator.
Jeremy Brown
CEO at Karihub
What is included
What lands on your side.
The artifacts you keep after the call, the build, or the audit.
Conversion audit of key pages
Where people leave, why the page asks for the wrong thing, and which proof is missing next to the ask.
Offer and messaging rework
A clearer reason to act, written for the person who actually lands, not for the internal slide deck.
Landing page design and rebuild
The layout, hierarchy, and path get rebuilt around one job so the next step is obvious.
Form and funnel friction fixes
Fields, steps, and copy that make people quit get cut or rewritten.
Proof and trust placement
Reviews, logos, and specifics sit next to the ask, not in a forgotten footer carousel.
A/B test plan
When traffic can support it, a short list of tests worth running. No button-color calendar.
Related insights
Read the thinking behind the work.
Practical guides for evaluating the problem, the scope, and the person you hire.
01
CRO
Read02What to fix before you run CRO tests
Tracking, offer, CTA competition, and mobile completion before anyone sells you a test calendar.
Landing pages
Read03Fix the offer before the button color
Why most landing page tests fail: the page never had a job.
MedSpa
Read04MedSpa traffic but no bookings
Diagnose listing, mobile next step, booking widget, and missed calls before another redesign.
Design
ReadConversion-focused web design
The layout decisions that move a visitor toward a call, and the ones that just look expensive.
Before we start
Questions about this work.
Short answers so you can tell if this is the right engagement.
When traffic can support them. Most sites I see need the offer and the page structure fixed first. Testing a weak page just gives you a precise number for a bad conversion path.
No. Landing page design is part of it. Homepages, pricing pages, and key service URLs get the same conversion rate optimization pass when they are in the way of pipeline.
Enough to see where people leave. A/B tests need more. Most companies I work with get the first lift from fixing the offer and the page job, not from a testing program.
Yes. I can diagnose and write the changes, or I can redesign the pages myself. Conversion-focused UX does not require replacing your whole team.
A conversion audit of the key pages, offer and messaging rework, path and form friction fixes, proof placement, and an A/B plan if traffic can support it.
A redesign rebuilds the site. CRO fixes the pages that already get traffic and still miss the sale. They often run together when the current site cannot hold a better offer.
Yes, when they exist. I also read the page the way a first-time visitor would. Analytics without a clear offer still produces a weak conversion path.
A focused landing page or homepage pass is usually one to three weeks. A wider set of URLs takes longer because each page gets a job before any tests start.
Conversion rate optimization is making the traffic you already have convert better. I start with the offer, the page job, and the path to the form. Tests come after the page has a reason to exist.
A conversion rate optimization consultant. You work with me on the audit and the rebuild, not a separate testing team that never saw the site. Conversion rate optimization services can stand alone or sit inside a website redesign.
Related services
Other ways I can help.
Same person, same commercial standard. Different entry point.
01
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View02Digital strategy consultant for companies that need a digital strategist, not a workshop deck.
Most teams do not need another workshop deck. They need a digital strategist who can say what the site is for, what to build first, and what can wait. I do digital strategy consulting that stays connected to design and website development, so the plan does not die in a PDF.
Website redesign
View03Website redesign services that protect SEO and give the site a commercial job.
A redesign fails when it starts in Figma. Website redesign services should start with website strategy, the pages that create pipeline, then website design and website development. I run that sequence so a custom website redesign does not erase the rankings you already have.
Technical SEO consulting
View04Technical SEO consultant for sites that need fixes in production, not another content calendar.
I work as a technical SEO consultant on crawlability, indexation, site architecture, schema, and the SEO risk inside a website redesign. SEO consulting here is implementation-heavy. If you need 40 blog posts a month, that is a different hire.
AI application development
View05AI application development for teams that need a product in production, not another demo.
Most Lovable, Bolt, and v0 apps stall after the prototype. You need someone who can take the idea from prompt to production: structured outputs, auth, billing, logging, cost controls, and a codebase your team can maintain.
White-label web development
ViewWhite-label web development for agencies that need senior delivery without another full-time hire.
Your client signed, the internal bench is full, and the deadline did not move. I handle white-label Next.js and Webflow delivery under your agency's brand, including a trial task, clear ownership, and code your team can keep.
