The People Behind the Work
We are a team of technical specialists, data engineers and systems consultants who care about one thing: making your data and systems work the way your business needs them to.
Built on Expertise, Driven by Outcome
Loncom was founded on the belief that most businesses are sitting on untapped potential locked inside their data. We exist to unlock it, by building the right systems, cleaning the right data, and connecting everything together so your teams can move faster and make better decisions.
Stefan Loncar
Founder & CEO
Stefan has had a passion for data since a young age, spending his career at the intersection of business operations and technology. He founded Loncom to bridge the gap that most businesses face — powerful systems that hold messy, disconnected data that nobody fully trusts. His approach is hands-on and outcome-focused: understand the problem deeply, build the right solution, and make sure it actually gets used.
The truth is in data, and from data we grow!
Antonio Karneluti
CTO
Antonio holds a PhD in Information Technology and brings deep technical expertise to every project Loncom delivers. He leads the architectural and engineering decisions behind our custom applications, integrations and AI implementations, approaching every challenge with rigour, precision and a determination to find the most effective solution
Every complex problem has a clean solution. Finding it just takes the right combination of experience and patience.
Meet our Team
Our consultants, data analysts, engineers and specialists bring expertise across HubSpot, Salesforce, NetSuite, Power BI, AI and custom development. Every project is staffed with the right people for the job.
Bojana Maletic
Team Lead CRM Developer & Data Analyst
Bojana brings an analytical, physics-trained mind to every CRM system she touches. As Team Lead CRM Developer & Data Analyst, she leads implementation, data migration, reporting, and automation projects across HubSpot, Salesforce, Pipedrive and more - with a particular focus on Python, Power BI, and AI-assisted workflows. Her attention to technical detail ensures your data stays clean, your systems stay integrated, and your business decisions rest on numbers you can trust.
Franjo Dumanovsky
Team Lead Full Stack Developer
Franjo leads Loncom's development team, combining full-stack technical expertise with a client-first mindset. Self-taught and now specializing in AWS, HubSpot, and custom integrations, he turns complex business requirements into working software that solves real problems - not just technically elegant code. His hands-on leadership ensures your custom applications and integrations are built to actually make your team's life easier.
Djordje Momcilovic
Team Lead Full Stack Developer
Djordje leads Loncom's development team with a hands-on approach, splitting his time between coding and coordinating so he stays close to the technical detail. His full-stack expertise spans JavaScript, React, Node.js, and HubSpot, and he's led projects ranging from CRM integrations to a full recruitment platform for student-athletes. His collaborative leadership style ensures your project gets both careful technical execution and a team that's genuinely invested in getting it right.
Bojana Mihajlovic
Team Lead CRM Developer & Data Analyst
Bojana brings a research scientist's precision to CRM consulting, having moved from chemical engineering labs across three continents into leading CRM strategy and delivery. As a HubSpot specialist with experience across Salesforce, NetSuite, Zendesk, and more, she leads both the client relationship and the delivery team from kickoff to go-live. Her instinct for understanding a system before fixing it means your CRM setup gets untangled properly, not just patched.
Mladen Mladenovic
Full Stack Developer
Mladen is a Full Stack Developer on Loncom's development team, working across JavaScript, Node.js, AWS, and HubSpot. He's currently building a full customer platform for a UK-wide client with 20+ locations, handling payment integrations, ID verification, and real-time data sync - alongside database migrations and custom web forms for other clients. His broad, hands-on technical grounding means he can pick up new systems fast and keep your data flowing correctly between them.
Andjela Stankovic
CRM Developer
Andjela is a CRM Developer on Loncom's CRM development team, specializing in HubSpot, JavaScript, and CRM automation and workflows. Naturally detail-oriented, she's known for solving problems properly rather than working around them - turning tangled client requirements into CRM logic that's clean, structured, and built to last. Her focus on getting the underlying logic right means your systems stay easy to run and easy to build on.
Nemanja Nikolovski
CRM Developer
Nemanja is a CRM Developer working across client data and HubSpot instances, with hands-on Salesforce experience as well. His programming foundation in C#, Java, and Python, combined with a genuine curiosity about how systems work, means he approaches every CRM setup by learning it from every angle before fixing it. That patient, thorough approach ensures your platform runs cleanly and your data stays reliable as your business grows.
Marta Suljagic
Full Stack Developer
Marta brings a lifelong pattern-spotter's instinct to full - stack development, having started coding at 12 and never looked back. She works primarily in Node.js, while her real pull toward machine learning and genetic algorithms plays out in Python whenever she gets the chance. Her optimism and eye for detail mean the small things other people skip over don't slip through the cracks on your project.
Bosko Jovovic
CRM Developer
Bosko brings an engineer's precision and a former truck dispatcher's real-time problem-solving to every HubSpot build he touches. As a HubSpot CRM Developer, he specializes in tailor-made workflows, high-impact dashboards, and platform integrations built around each client's business logic. His pedantic, detail-first mindset means your systems don't just work on the surface, they hold up cleanly under the hood.
Natasa Loncar
Data Administrator
In her data work at Loncom, Natasa draws on experience from sales management, customer care at a bank, and administration at a law firm. Alongside data administration, she is also involved in marketing for Loncom, where that same precision and attention to detail come through. Years of working with clients under strict deadlines make her a dependable anchor for the team around her, and she brings that same approach to the content she creates for Loncom's marketing.
Nikola Meseldzija
Data Analyst
Nikola brings 8+ years of automotive industry experience and a Master's degree in Business Information Systems to every dashboard he builds. His background spans purchasing and supply chain, giving him a business-first lens on the data he works with in Power BI, Excel, and SQL - from KPI development to process optimization and workflow automation. His combination of business fluency and analytical rigor ensures your reports don't just show numbers, they actually support the decisions your teams need to make.
Anja Misan
Full Stack Developer
Anja is a Full Stack Developer on Team Green, working across JavaScript, React, SQL, and both HubSpot and Salesforce. She specializes in the connective tissue between systems - her integration work linking Evessio and Crowdcast to HubSpot keeps event and webinar data flowing into the CRM automatically, matched correctly and without manual data entry. Her physics-and-engineering mindset means she solves problems properly, delivering integrations that hold up in the small details other builds tend to miss.
Ksenija Meseldzija
People & Operations Manager
Ksenija brings structure and people-first thinking to everything she runs at Loncom. As People and Operations Manager, she oversees the full HR scope - recruitment, onboarding, performance reviews - while building the procedures and policies that keep the business running smoothly behind the scenes, alongside support on the sales and marketing side. Her instinct for spotting where a process is missing, and turning that gap into a working system, means the team she supports has clear structure to rely on every day.
Ognjen Karisik
Full Stack Developer
Ognjen brings a pragmatic, no - nonsense approach to software engineering, treating it as a craft focused on clean execution and efficient problem-solving. Working across Java, C#, and JavaScript, he specializes in autonomous AI agents, RAG architectures, and scalable microservices - including building an AI-driven tool that automates sprint planning and code delivery. His focus on getting work done right without overcomplicating it means your systems get built efficiently, without unnecessary technical debt.
Vanja Stankic
CRM Developer
Vanja is a CRM Developer who helps clients turn complex, messy data into clear, well-structured CRM systems. Working primarily with HubSpot, she builds and maintains automations, using JavaScript when needed to create tailored solutions. With a background in Computer Engineering and an international perspective shaped by growing up in Canada, Vanja brings a practical, analytical approach to every project. She enjoys working with large datasets, solving complex problems, and finding simple, effective solutions. For Vanja, communication is key to understanding client needs and turning them into solutions that work.
Dunja Gvozdenovic
Intern Full Stack Developer
Dunja builds client - facing features end to end, from scoping requirements through to deployment, working across JavaScript, Node.js, AWS, Docker, and HubSpot. She owns API integrations connecting client systems with external services and introduced Docker-based containerization to streamline delivery, drawing on a background that spans CRM development, deep learning research, and robotics. Her fast, hands-on learning curve means she can pick up new technical challenges quickly and deliver working solutions your team can rely on.
Let's Talk About Your Stack
Tell us what you are working with, what is not working, and what you need to fix. We will come back to you with a clear view of what is possible.