Stefan Momcilovic

Operations Associate

Vranje, Centralna Srbija, Serbia2 yrs 10 mos experience

Key Highlights

Achieved 5-10% improvement in core KPIs.
Engineered landing pages with significant conversion boosts.
Led successful CRO initiatives for multiple brands.

Stackforce AI infers this person is a B2C E-commerce Optimization Specialist with a focus on Conversion Rate Optimization.

Contact

Skills

Core Skills

E-commerce OptimizationConversion Rate OptimizationShopify DevelopmentFull Stack Development

Other Skills

Conversion OptimizationConversion RateA/B TestingLanding Page OptimizationLead GenerationE-CommerceTeam ManagementDigital StrategyAnalytical SkillsDigital Marketing AnalyticsShopifyShopify PlusFunnel OptimizationConversion TestingData Analysis

About

I help e-commerce brands unlock growth, turn attention into action, and transform traffic into meaningful, measurable revenue. For over 5 years, I’ve been passionately focused on conversion optimization and Shopify development, working closely with teams to identify friction points, remove hesitation, and create clear, confident paths to purchase. I don’t just analyze data, I turn insights into impactful improvements that consistently move core KPIs. I’ve partnered with brands across fashion, home, lifestyle, and multiple DTC verticals, delivering strong, repeatable gains in add-to-cart rates, checkout conversion, revenue per session, and full-funnel performance, on average 5-10% improvement. What motivates my work is understanding the real reasons behind user behavior and turning those insights into sustainable, long-term growth. My approach combines robust quantitative analysis with deep qualitative research, blending GA4, heatmaps, session recordings, and user audits with clear experimentation roadmaps and disciplined A/B testing. This balance allows me to drive reliable results because lasting growth comes from intentional experimentation, thoughtful UX, and confident, data-backed decisions. Core Skills: CRO & A/B Testing • Conversion Rate Optimization • Experimentation & Test Strategy • User Research & Analytics • Revenue-Focused Optimization • CRO Management & Growth Strategy • Funnel Analysis • Shopify Development • E-commerce Optimization

Experience

2 yrs 10 mos

Total Experience

11 mos

Average Tenure

Current Experience

Eli z group

Ecommerce Manager

Jul 2025 – Dec 2025 · 5 mos · Belgrade, Serbia · Remote

Led the overarching e-commerce strategy to ensure paid traffic landed on fully optimized sites, establishing a clear goal of maximizing revenue per session. By combining qualitative UX research with rigorous A/B testing, I successfully transformed the digital funnel for DTC brands.
Key Achievements:
Spearheaded continuous CRO initiatives, executing UX redesigns (such as review section optimizations) that generated a 37.4% increase in CVR and a 38.3% lift in Revenue Per Visitor (RPV).
Orchestrated the transition to a streamlined one-page checkout, increasing checkout conversion rates by 9.7% while significantly reducing return rates and discount usage.
Engineered data-driven landing pages and aligned Paid Media strategies, maintaining a highly profitable 2.86 ROAS on social ad spend.
Developed automated discount logic (tiered Buy X Get Y% bundle offers) that successfully increased storewide Average Order Value (AOV) by 11% and boosted overall conversion rates by 8%.

E-commerce OptimizationConversion OptimizationConversion RateA/B TestingLanding Page OptimizationLead Generation+8

Pelsbarn

CRO Manager

May 2025 – Jun 2025 · 1 mo · Belgrade, Serbia · Remote

Took full ownership of the conversion strategy and led the daily optimization workflow for luxury product lines. Leveraged deep data interpretation and user behavior analytics to pinpoint exact customer drop-off points.
Key Achievements:
Engineered and executed high-converting landing pages that successfully drove an approximate 20% improvement in conversion rates.
Guided the team to prioritize high-impact experiments while building and testing entirely new funnels to uncover better pathways for user acquisition and sales.

E-commerce OptimizationConversion OptimizationConversion RateA/B TestingFunnel OptimizationConversion Testing+7

Purplefire

2 roles

Team Lead

Promoted

Nov 2024 – Apr 2025 · 5 mos · Belgrade, Serbia · Remote

Acted as the primary growth consultant for multiple high-value e-commerce brands, translating deep audience insights from GA4, Mouseflow, and Microsoft Clarity into complex A/B tests using Convert.com, Shoplift, and Intelligems.
Key Achievements:
Engineered strategic upsell placements that increased client monthly revenue by over $23,000.
Implemented UX/UI enhancements that boosted client CVR by up to 21.5% and Average Order Value (AOV) by 13.5%.
Delivered a consistent 5–10% uplift in conversion rates across my client portfolio while mentoring a team of CRO specialists.

E-commerce OptimizationA/B TestingConversion OptimizationConversion RateTeam LeadershipTeam Management+8

CRO Specialist

Apr 2024 – Nov 2024 · 7 mos · Belgrade, Serbia · Remote

Executed daily testing roadmaps and ran end-to-end A/B tests. Proactively communicated performance metrics to clients, resulting in a rapid promotion to Team Lead within 6 months.

E-commerce OptimizationE-CommerceShopifyShopify PlusA/B TestingConversion Optimization+8

Freelance

Shopify Developer

Jun 2023 – Apr 2024 · 10 mos · Vranje, Centralna Srbija, Serbia · Remote

Provided critical development support for US, Australian, and European e-commerce brands, uniting heavy backend engineering with conversion-focused frontend design.
Key Achievements & Projects:
Regent Row: Executed a comprehensive 'Above the Fold' UX redesign for product pages, resulting in a 1,000% improvement in Add-to-Cart rates and a 699% increase in checkouts initiated.
Remade: Partnered to create custom landing page sales funnels specifically designed to enhance marketing efforts and significantly boost store conversion rates.
Custom App Development: Built a custom Shopify application, Guardito, and engineered dynamic cart scripts that scan product tags to automatically apply tiered discounts (e.g., 20% off for 3 items).
Paloceras: Transformed Figma designs into fully functional Shopify 2.0 storefronts

ShopifyShopify PlusA/B TestingConversion OptimizationConversion RateShopify Development+1

Everything420.com

Shopify Developer

Feb 2023 – May 2023 · 3 mos · Remote

My main job was moving them from an old version 4 of the Dawn theme to the newest one, making sure everything kept working perfectly. I also wrote code for new features that the client specifically asked for to improve users online experience.

ShopifyShopify PlusWeb DevelopmentE-CommerceShopify Development

Perceptiv digital

Shopify Developer

Nov 2022 – Jan 2023 · 2 mos · Belgrade, Serbia · Remote

I served as a hands-on technical developer dedicated to Shopify and Neto/Maropost Australian ecommerce, keeping client stores running smoothly and effectively. My day-to-day focus was on troubleshooting critical bugs to ensure a glitch-free shopping experience, while simultaneously coding custom sections and functionalities that allowed brands to expand their site capabilities without relying on expensive apps.

ShopifyE-CommerceShopify PlusFront-End DevelopmentShopify Development

Cleverchoice d.o.o

Full Stack Developer

Oct 2021 – Oct 2022 · 1 yr · Belgrade, Serbia

I provided critical development support for US-based Shopify brands, balancing high-speed international work with complex backend engineering for local projects. My work successfully united heavy backend engineering with creative frontend design: I built robust management systems for Serbian pharmacies using Laravel and developed custom in-house Shopify Apps with Node. Simultaneously, I transformed client storefronts by creating WordPress sites (Divi/Elementor) and coding advanced Shopify functionalities, using A/B testing to ensure my work drove measurable results.

BootstrapObject-Oriented Programming (OOP)jQueryPHPNode.jsShopify+13