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Custom software, built around how your business actually works.

I'm Selmir, an independent full-stack engineer. I design and build web applications, internal tools and integrations that replace spreadsheets, copy-paste and workarounds with one system your team can rely on.

Start a projectSee how I work
  • Top Rated Plus on Upwork
  • 100% Job Success
  • 50+ products shipped

Teams and founders I've built for

  • Scisbo
  • Momentum Research
  • Next Mind
  • Byte
  • Satlantis Studios

Software for the work your off-the-shelf tools can't handle.

Every engagement starts from the problem, not a template. These are the kinds of systems I build most often.

  • Custom software development

    Systems designed around your workflow, data and rules, instead of bending your business to fit a generic product.

    Often: Booking and scheduling, Quoting engines, Client portals

    Learn more about Custom software development

  • Web applications

    Fast, secure apps for customers and teams, with accounts, roles, payments and the dashboards behind them.

    Often: SaaS platforms, Marketplaces, Member areas

    Learn more about Web applications

  • MVPs

    A focused first version that tests the idea with real users, built so it can grow instead of being rewritten.

    Often: Validation builds, Pilot products, Investor demos

    Learn more about MVPs

  • Internal tools

    Admin panels, back-office apps and approval flows that take the busywork off your team.

    Often: Admin panels, Inventory tracking, Approval flows

    Learn more about Internal tools

  • Integrations & automation

    Connect the tools you already use so data moves on its own, and repetitive steps run without anyone touching them.

    Often: CRM and payments sync, API integrations, AI-assisted workflows

    Learn more about Integrations & automation

  • Existing product development

    Take over, stabilise and extend software that's already running, whether a team built it or an AI app builder did.

    Often: New features, Performance and security fixes, Codebase takeovers

    Learn more about Existing product development

Not sure which of these fits? Describe the problem and I'll suggest an approach.

Describe your problem

From the first conversation to a product that keeps improving.

Each step ends with something you can see and approve, so you always know where the project stands.

  1. Step 1

    Understand the problem

    We talk through how the work happens today, where it breaks, and what a better result looks like for you and your customers.

    You get: A written summary of the problem and goals

  2. Step 2

    Define the solution

    I turn that into a clear scope: what to build first, what can wait, which tools to connect, and how we'll measure success.

    You get: Scope, timeline and estimate in writing

  3. Step 3

    Design the experience

    Screens and flows are mapped before code, so you can click through how it will work and adjust it cheaply.

    You get: Clickable flows and the data model

  4. Step 4

    Build in increments

    Features arrive in small, working pieces on a private preview link, with a short update every week.

    You get: A working preview, updated weekly

  5. Step 5

    Launch

    Testing, data migration, hosting and monitoring are handled, and your team gets a walkthrough before go-live.

    You get: Live on your domain, in your accounts

  6. Step 6

    Improve

    Real usage shows what matters next. We refine, add features and keep the system healthy as the business grows.

    You get: A prioritised roadmap and ongoing support

Systems people use every day.

All case studies

  • SaaS platform

    FreelyDesk

    Projects, invoices, time tracking and a client portal in one workspace. Clients follow progress through a single link instead of status meetings.

    • Private workspace with a public client portal
    • Clients follow progress without creating an account
    Read the FreelyDesk case study

  • Internal workspace

    Scisbo

    An AI assistant, file storage, boards and real-time messaging under one login, built as connected services so each part can grow on its own.

    • Five tools replaced by one login
    • AI assistant answers with structured results
    Read the Scisbo case study

  • Marketplace

    Kupuj Domaće

    A commission-free marketplace connecting buyers with local farms and households across Bosnia and Herzegovina.

    • Producer storefronts and a guided listing flow
    • Search by location, canton and category
    Read the Kupuj Domaće case study
Selmir, smiling, in a portrait photo
Selmir, working remotely with clients worldwide

You work directly with the engineer building your system.

I've spent more than five years building software for clients, from SaaS platforms and marketplaces to internal workspaces and AI features used by real teams.

I care about what the software needs to change in your business, not just the code. I'll tell you honestly what to build first, what can wait, and when something isn't worth the money.

  • Everything in your name

    Code, hosting, domain and data belong to you from day one.

  • Progress you can click

    A working preview every week instead of status reports.

  • Direct and responsive

    No account managers. Replies within 24 hours.

  • Proven, maintainable tech

    Mainstream tools, so any developer can continue the work later.

Tools I work with most

  • React
  • Next.js
  • TypeScript
  • Java
  • Spring Boot
  • PostgreSQL
  • MongoDB
  • Redis
  • Docker
  • Stripe
  • OpenAI
  • Spring AI

Start with one developer, not an agency's overhead.

Agency quotes pay for account managers, project managers, sales and offices before a line of code is written. Working with me, your budget goes into the software itself.

  • One person who knows your system

    The engineer you talk to is the one who writes the code. Nothing gets lost between a sales call, a project manager and a developer.

  • Decisions in hours, not meetings

    Questions get answered the same day, and a change of plan doesn't need a new statement of work.

  • Ready for the team you'll hire

    Mainstream tools, clear documentation and everything in your name, so adding developers or an in-house team later is simple.

Three ways to work together.

Whichever fits, the terms are agreed in writing before any work starts.

  • Fixed-scope project

    Quoted up front

    For a clearly defined system or first version. Scope, timeline and total are agreed before day one.

    • Changes only if you decide to add something
    • Weekly previews against the agreed plan
    Get a fixed quote

  • Ongoing development

    Pay hourly

    For ongoing improvements, existing products and work where priorities shift.

    • Pay only for hours worked
    • Change priorities whenever you need to
    Book development hours

  • Contract on your team

    Hourly or monthly

    An extra senior engineer for a release, a feature or a few months of steady work.

    • Remote, part-time or full-time
    • Works inside your tools, reviews and workflow
    Discuss a contract

What clients say after working together.

100% Job Success on Upwork

“By far one of the best full stack custom software developers I have worked with! Wholeheartedly recommend!”

Seth B.Scisbo

  • “He helped figure out all of the detail that project needed and built a great functional prototype that has been extremely useful.”

    Graham Shillington, Founder, Next Mind

  • “Very clear communication from the start. Selmir is very patient and made sure everything was in order for each milestone.”

    Guillaume Hucheloup, Momentum Research

  • “Selmir went above and beyond what was requested of him and has been an absolute pleasure to work with.”

    Conner Dunda, Satlantis Studios

Common questions

Something else on your mind? Email me and I'll answer it directly.

What kind of businesses do you work with?

Mostly small and mid-sized companies, startups and product teams. Typical clients have outgrown spreadsheets and generic tools, or have a product that needs an experienced engineer to move forward.

How much does custom software cost?

It depends on what the system needs to do, so there's no fixed price list. After we've talked through the problem, you get a written scope and estimate, and you choose a fixed budget or pay hourly.

Can you work on software we already have?

Yes. I start with a review of the codebase and infrastructure, explain in plain language what's solid and what isn't, then fix, stabilise and extend it.

Can you connect the tools we already use?

Usually, yes. CRMs, payment providers, accounting software, email and most tools with an API can be connected so data moves between them automatically.

Who owns the code?

You do, completely. Code, hosting, domain, database and other accounts are set up in your name from the start.

What happens after launch?

You get a handover with everything needed to run the system. Most clients keep improving it with me hourly or with a fixed budget per feature.

Tell me what's slowing your business down.

Describe the problem in your own words. I'll reply within 24 hours with questions and a suggested next step.

Start a project[email protected]