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

8 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

    svezapausal.rs

    The whole arc in one product, mine end to end: designed the system, built it, 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 - architecture through marketing, alone.

    SaaS
    architected, built, marketed
    own product
    Solo
    Read the case study
  3. 03

    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
  4. 04

    Ading GmbH

    Windows, doors and metal construction in Vienna. Delivered entirely in German for the Austrian market, credited in the footer. The answer to the question every DACH client asks first.

    DE
    delivered in German
    Vienna, AT
    Solo
    Read the case study
  5. 05

    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
  6. 06

    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
  7. 07

    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
  8. 08

    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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