Proven Experience in Demanding Fields

These are projects where I had a big impact on the technical processes. I have a track record of delivering robust systems for complex business needs, from high-volume marketplaces to secure fintech platforms.

Metara educator dashboard - Knowledge Nodes list with topics, status, and Bloom levels

AI driven Ed-Tech readiness platform

I built all the platform from idea stage to MVP. It allows educators to create Bloom level taxonomy-based AI-driven knowledge notes, and then students can take either learning or exam sessions driven by AI. This does involve multiple AI agents, pipelines, MCPs, and else. To accomplish this in record time, I did use Cursor IDE, Claude Code, Codex, and Wispr.

Cursor IDE Claude Code Codex Wispr AI-driven development Node.JS ReactJS Typescript MongoDB Idea to production Kubernetes ed-tech

AI-driven development

I used all the modern tools to develop this software in record-breaking time: Cursor IDE, Claude Code, Codex, Wispr and more.

AI-driven platform

This platform's target is to count the readiness of the person, if the person is ready or not for the challenge. All private and AI-based.

Personal data security

Handled personalized data with safeguards so there was no leakage. Designed the architecture to keep personal data safe.

Idea to MVP

I developed all the foundation from Kubernetes, DevOps, AI pipelines, AI agents, backend UI, all of it.

Commodities Marketplace

Core developer from idea through production, then lead for integrations and infrastructure as the commodities marketplace scaled.

Node.js AWS Idea To Production MongoDB Classical Servers Kubernetes Micro-Services

From idea to $1.5B/yr

I built the initial version of the entire backend.

50+ Microservices

Complex backend powering integrations, legal workflows, and international shipping.

Modern Fintech

Core work on final pricing and financial guarantees across the marketplace.

Sensitive data

Financial, legal, and business data management at scale.

Direct to CTO

Built all backend and DevOps foundations, later onboarded a couple of dev leads.

Reinvited for scaling

Came back to help during scaling. Migration to Kubernetes and integration with Maersk.

What clients said about my work

Feedback from people I built for directly.

Backend Engineering

I built backend for $1.5B volume marketplace

Over my years in technology I've seen thousands of developer resumes. I contact and interview about 10% of them and would hire 10% of the developers I interview. Luka's immediately stood out as a reliable, highly skilled and talented developer who I can lean on with complex details. Lukas delivers as promised and his thoroughness and thoughtfulness when coding gives me peace of mind to know the job will be done well. I hope to continue working with Lukas for years to come.

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FullStack rebuild

I did full saas rebuild. Devops, APIs, UIs, UX.

Lukas is hands-down the best developer I have worked with in 15+ years of dev hires. He is sharp, intuitive, detail-oriented, and always thinking big picture, several steps ahead. He's not just a developer - he's also part engineer, strategist, and business mentor. What started as a project to fix my app's broken server evolved into a full rebuild - not just to clean up the mess I was in, but to create something that could truly endure and scale for years to come. Lukas tackled complex problems quickly, took my current mess, my verbose notes and ideas, and pages of mockups and has delivered feature after feature in ways I thought would only belong in our "someday" plans, not our current reality. I've watched him map logic, do math, and propose solutions multiple times while live on our calls. Pretty amazing! His communication is just as solid. He kept me in the loop with updates that over-deliver, progress reports, and questions when needed. I always knew exactly where we were in the project and where we were headed next. Lukas's character sets him apart. He's never condescending, never makes you feel like your ideas or opinions are too much. He's professional, patient, and focused on what's best for the project. When he pushes back, I listen because he usually sees something I haven't, and his ideas are gold. If you get the opportunity to work with him, take it. Worth every penny. I look forward to working with him again for our next phase of development.

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Fullstack Solo Build

Lukas is one of the best developers I have ever hired, he has excellent technical skills and pick up new technology very quickly. He helped me achieved goals that is challenging with his good communication skills and commitment to work! highly recommend! I am sure he will be the first developer I will contact when new work come!

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Hostinger website - homepage with Services mega-menu, pricing and domain search

Software Engineering at Hostinger

At Hostinger, I was the 5th developer and contributed to the company's growth to 15M+ users. I developed full-stack customer facing and internal dashboards, integrations, financial automations, staff-managers. Left when company had ±600 global staff. I did this during my master's in physics.

Full-stack development Systems Architecture API Integration Technical Writing and Documentation Stakeholder Management DevOps CI/CD Email Deliverability GitHub SQL Finances automation

15M

Users world-wide

1 Room to 3 HQs

From 1 room of couple people to 3 global HQs growth

First Sales - email deliverability hero: smart infrastructure for cold outreach

CTO for Cold Email Outreach Platform

As the CTO, I built and managed a development team, collaborated with UI designers, and worked directly with the CEO to launch a cold email outreach marketing platform. I built all foundational tech from DevOps, backend, and UI, then onboarded other developers and mentored.

Next.js React Node.js Email Deliverability Artificial Intelligence (AI) REST API DevOps

Founding engineer

I built directly with CEO from idea to production and beyond

0 to 40K MRR

Rapid launch and customer onboarding within 3 months

AI prospecting

Leads automation and AI-powered personalised outreach

Email deliverability

Precise scheduling queues and other high-complexity methods to reach the inbox.

Toptal homepage highlighting hire the top 3% of the world's talent

Top 3% Software Engineering at Toptal

As a Software Engineer at Toptal, I was part of the top 3% of developers worldwide. I worked on high-level projects, showcasing deep expertise in software engineering. I delivered a full AI-driven platform build-from technical design through launch-including a distinctive AI agent–based UX for users.

DevOps AWS Node.js CI/CD Artificial Intelligence (AI) Stakeholder Management React Technical Writing and Documentation Systems Architecture Data Architecture

EncargoGo homepage - shop from the U.S. with landed cost pricing and SkyPostal delivery

Interim CTO for EncargoGo

As the Interim CTO, I developed strategies, developed all foundation code and devops. Onboarded developers, and led integrations with shipment partners for EncargoGo, an AI-driven international sales platform.

API Integration Artificial Intelligence (AI) Team Leadership Node.js TypeScript React Next.js Stakeholder Management

Proschooler - homeschool platform UI builder preview

Legacy infrastructure upgrade and full saas rebuild

Worked directly with founder. This is a tool for homeschoolers. I solo built all of it. Devops, API, UIs. All done in 370h.

TypescriptBusiness DevelopmentTDDReactJSNodeJSNextJsMongoDBDynamoDBSQL

Ed-tech

Platform for homeschoolers

Modern Builder

Canva-like UI builder to build pages and later export as PDFs

Principal Software Engineering at Upwork

Recognized as 'Top Talent' on Upwork, leading projects with expertise in AI, TypeScript, JavaScript, Node.js, ReactJs, MongoDB, CSS. Contributed to various high-impact projects on the platform.

CSS JavaScript MongoDB Node.js Artificial Intelligence (AI) TypeScript

100% Job Success

The percentage of jobs that resulted in a great client experience.

4070 Hours

Total hours delivered

Total projects worked on

SaaS Marketplace

I was Co-Founder and CTO

We were a bootstrapped startup valued at $20M at its peak. I built the core platform, hired engineering team, and led product development. We launched dozens of early-stage startups, and I helped them navigate scaling challenges, technical debt, user communication and more. This video has snippets of what Pitchground was. It showcased our global team meeting in Bali.

TypescriptBusiness DevelopmentTDDReactJSNodeJSNextJsMongoDBDynamoDBSQL

Screenshot of the SaaS application for grid subcontractors

SaaS for National Electrical Grid Subcontractors

I solo built this end-to-end. Had to communicate with sub-contractors to learn all how grid subcontractors work, provide insights and technical solutions for business cases. This is not a public app, it's used internally by sub-contractors of national electrical grid operator in Lithuania.

This B2B platform manages the complex lifecycle of national grid infrastructure repairs, upgrades, and maintenance.

Key features included integration with governmental systems, document and inventory management, and communication tools for in-field workers.

Node.js Classical Servers Idea To Production MongoDB ReactJs Geospatial

Integrations

Unique governmental tools integration for subcontractor needs.

Sensitive data

Highly sensitive governmental data pipeline.

Geospatial

Geo coordinates-based indexing and tasks planning and mapping.

Communication helpdesk documentation - knowledge base setup and custom domain guide

Customer Support Saas

I built a communication software which has the shared inbox feature, so all emails coming to all of those inboxes land into this software. Staff can reply to those messages from the same interface without direct access to the email. Also, there were knowledge bases so the user would be able to host their own knowledge base website. There is also a live chat widget which would allow you to search within the knowledge base or talk live with the support.

Node.js TypeScript Leading ReactJS WebSockets Socket.io Hosting DevOps Customer Support

From idea to production

I built the initial version, the entire backend, UI, UX, devops, everything.