Nikola Arsić
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Span2016-2026Storefronts26Markets22Languages3

One person.
Idea to paying customers.

Twenty-six storefronts and €12M in store revenue in 2025, run by one person. I am a systems architect who writes the code and takes the product to market - custom apps end to end, plus the automation and technical SEO that keep them running and found. For e-commerce teams and agencies who keep receiving work nobody can implement.

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Results

11 entries

  1. 01

    Jungheinrich

    Took over from the previous service providers: a custom setup, spread across country storefronts, with almost no documentation. I own all of it now - features, bugfixing, security, AWS devops, and the PrestaShop 9 migration in flight.

    “He took over technical management of 22 Jungheinrich online shops, which were poorly managed by the previous service providers. With very little documentation on a custom set up, he has been able to provide secure and stable environments - and importantly delivering sales growth.”
    Cale Edwards · Senior Research Consultant, Prediki
    €12M
    store revenue across the estate, 2025
    • Near-zero downtime
    • Security hardened
    • Stability improved
    • 22 → 26 storefronts
    2023 - present
    Solo
    Read the case study
  2. 02

    Shopify storefronts

    Technical SEO consultant and implementer for Elvion and SearchProfit, deep in the theme layer on their clients’ live stores - Liquid, collection and product templates, schema, canonical and hreflang handling, speed. Sporting goods, fishing tackle, natural stone, composite decking, nail care and more, with some BigCommerce for Elvion. Named nowhere, by design.

    White-label
    two agencies, named nowhere
    ongoing
    With agency teams
  3. 03

    svezapausal.rs

    The whole arc in one product, mine end to end: designed the system, built it, did the SEO, took it to market, and support the paying customers myself. Invoicing, KPO books, payment limits and tax obligations for Serbian flat-rate taxpayers, plus ten free calculators.

    Top 10
    avg. Google position, weeks after launch
    • 27 queries in the top ten, month one
    • Paying customers
    • 10 free calculators
    • Design, build, SEO, marketing
    own product
    Solo
    svezapausal.rs ↗
    Read the case study
  4. 04

    AdvokatX

    Case management for Serbian law firms, mine end to end: cases, deadlines, the per-case journal and billing under the Advokatska tarifa, sold at a public price with a 14-day trial. Alongside it, a free legal portal in Serbian and English where a lawyer reviews every guide before it publishes, plus two free calculators.

    162
    pages live at launch, Serbian and English
    • Multi-tenant SaaS for law firms
    • Lawyer-reviewed legal guides
    • Attorney-fee and deadline calculators
    • Design, build, SEO, marketing
    2026, own product
    Solo; legal content reviewed by a lawyer
    advokatx.rs ↗
    Read the case study
  5. 05

    Ading GmbH

    Windows, doors, sun protection and metal construction in Vienna. Design, development and SEO, delivered entirely in German for the Austrian market - then rebuilt from a compromised WordPress install onto Next.js.

    40 → 22
    avg. Google position, 2025 → 2026
    • Avg. position 40 → 22
    • Top-10 keywords 91 → 152 a month
    • WordPress → Next.js
    • Delivered in German
    Vienna, AT
    Solo
    ading.at ↗
    Read the case study
  6. 06

    RD Stolarija

    PVC and aluminium joinery, made and fitted by a Požarevac workshop with 15+ years in the trade. Redesigned and rebuilt the site - 447 KB of legacy JavaScript down to 2 KB - and ran the SEO behind it.

    2×
    organic clicks from Google
    • Avg. position 22 → 11
    • Organic clicks doubled
    • JavaScript 447 KB → 2 KB
    • Design, build, SEO
    2025 - present
    Solo
    stolarija.rd-inzenjering.rs ↗
    Read the case study
  7. 07

    Blitzputz

    Cleaning and Hausbetreuung across Vienna. Name, brand, design, build and SEO architecture for a new company: eight services mapped to all 23 Bezirke, each district page carrying its own local content rather than a template with the name swapped.

    184
    district landing pages
    • 8 services × 23 Bezirke
    • Brand, design, build, SEO
    • Delivered in German
    2026, Vienna, AT
    Solo
    blitzputz.at ↗
  8. 08

    German public sector

    Delivered work for the German public sector. The projects are under NDA and are not described here - which is the same discretion every agency client gets.

    NDA
    sector named, work not
    Germany
    Under NDA
  9. 09

    Carport

    Belgrade airport parking. I founded it and I run it - the booking system, the operations behind it and the site itself, built with a team. Over 500 bookings taken and served.

    500+
    bookings taken
    own company
    Founded it, built with a team
  10. 10

    Stay at Home - City of Belgrade

    Ostani kod kuće. My team and I volunteered to the City of Belgrade crisis headquarters during the Covid-19 emergency and built two things from nothing in about two months: the public site where isolating and elderly residents asked for help, and the real-time back office the crisis staff ran it from.

    1,000+
    people reached
    • Medicine and food delivered
    • Public site + crisis back office
    • Real-time dispatch
    • Unpaid
    2020, volunteered
    With a team
    Read the case study
  11. 11

    Marco Dental Tourism

    Technical lead for a dental-tourism platform serving patients travelling into Serbia for treatment.

    Tech lead
    direct client
    Serbia
    As technical lead

What I am actually hired for

PrestaShop

Twenty-six PrestaShop storefronts, one developer.

Development, upgrades, maintenance and SEO for PrestaShop 1.6, 1.7, 8 and 9 - by the person who runs a 26-storefront, 22-market estate single-handed, with €12M in store revenue in 2025, and is migrating it to PrestaShop 9 and Hummingbird right now.

PrestaShop 1.6 · 1.7 · 8 · 9 · Hummingbird · Symfony · AWS

Shopify

The implementer two SEO agencies keep bringing back.

Years in the Shopify theme layer on live revenue-carrying storefronts: Liquid and Online Store 2.0, collection and product templates, schema, canonical and hreflang handling, Core Web Vitals. Delivered white-label as standard - your client never needs to know I exist.

Shopify · Shopify Plus · Liquid · Online Store 2.0

Custom apps & products

Whiteboard to paying customers, by one architect.

The work I most want: take a problem, design the system, build the product, ship it, and take it to market - including the automation and AI tooling that keeps it running. Ten years across React and Next.js, Vue and Nuxt, Laravel and Node, not a contractor executing someone else’s spec but the person who decides the architecture and then lives with it.

Architecture · Next.js · Nuxt · React · Vue · Laravel · Node · WooCommerce · headless

Technical SEO

Audits that come with the implementation attached.

Crawlability, indexation, rendering strategy, structured data and Core Web Vitals - diagnosed and then actually fixed, in your codebase, by the person who diagnosed it.

Shopify · PrestaShop · WooCommerce · Next.js

Eight events. Five first places.

Solving unfamiliar problems fast, under a clock, with strangers watching: eight events across three countries, five first places, 2016 to 2022.

Full record

Written down

All guides

Tell me what is broken.

The form asks for your platform, your budget band and what is actually wrong. That is deliberate - I am one person, so I would rather have a short conversation that goes somewhere than a long one that does not.

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