Nikola Arsić
Start
Span2016-2026Storefronts26Markets22Languages3

One person.
Idea to paying customers.

One company replaced an entire department with me. 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

10 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
    €11M+
    annual revenue, grown to
    • Near-zero downtime
    • Security hardened
    • Stability improved
    • 22 → 26 storefronts
    2023 - present
    Solo
    Read the case study
  2. 02

    Shopify & BigCommerce storefronts

    Technical SEO consultant and implementer for Elvion and SearchProfit, deep in the theme layer on their clients’ live stores - Liquid and Stencil, collection and product templates, schema, canonical and hreflang handling, speed. Sporting goods, fishing tackle, natural stone, composite decking, nail care and more. 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
    • Page one within weeks
    • Paying customers
    • 10 free calculators
    • Design, build, SEO, marketing
    own product
    Solo
    svezapausal.rs ↗
    Read the case study
  4. 04

    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.

    2×
    keywords in Google’s top 10
    • Avg. position 40 → 21
    • Top-10 keywords 100 → 198
    • WordPress → Next.js
    • Delivered in German
    Vienna, AT
    Solo
    ading.at ↗
    Read the case study
  5. 05

    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
  6. 06

    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 ↗
  7. 07

    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
  8. 08

    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
  9. 09

    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
  10. 10

    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

E-commerce development

Twenty-six storefronts, one person.

Feature work, migrations, security and devops across e-commerce platforms - including a PrestaShop estate spanning 22 markets, run single-handed.

PrestaShop · WooCommerce · Next.js · Nuxt · headless

Shopify & BigCommerce

The implementer two SEO agencies keep bringing back.

Years in the theme layer of both platforms, on live revenue-carrying storefronts: Liquid and Stencil, 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 · BigCommerce Stencil · Liquid · Stencil

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. 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 · Postgres

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 · BigCommerce · PrestaShop · WooCommerce · Next.js

Automation & AI

The repetitive part of your operation, removed.

Workflow automation, internal tooling and AI-assisted pipelines - built by someone who has shipped and operated a SaaS alone, not someone describing one.

Node · Express · Laravel · PHP · Python · custom tooling

Eight events. Five first places.

Solving unfamiliar problems fast, under a clock, with strangers watching. It is the closest measurable proxy for what a one-person consultancy is actually sold on: five first places across three countries and six problem domains.

Engineering competition placements, 2016 to 2022
PlaceEventYear
1stTECH 4 HEALTH - Stada & ICT HubHealth2022
3rdEESTech Challenge FinalsIoT - smart house2019
1stEESTech ChallengeIoT - smart farm2019
1stSymOrg Case StudyFlat-rate tax, Serbia2018
3rdHacking the Digital Divide - EC & SofiaDigital inclusion2018
1stDevtech Cloud & IoT - BINARYEnvironment, cloud, AI2017
3rdFON Hackathon - ECO BASKETEnvironment2017
1stBITE OF A WEB - Byteout & EESTECSearch engine2016

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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