Denis P.-Senior Product Engineer & Delivery Lead | React · Next.js · TypeScript
Check rate
Experience
Founder & Product Engineer
CodePixelfy (Estonia OÜ, Delaware LLC, Serbian DOO)
Bootstrapped software company; own products and client automation work
- Build and operate products end to end: product decisions, architecture, delivery, infrastructure and billing, without a team to delegate the hard parts to.
- SignBatch: a workflow product that lets agencies and consultants send an entire client document packet through a single link and see at a glance what is done and what is outstanding. Next.js, MongoDB, Redis, BullMQ, Stripe, running on AWS.
- Automation: built the company's internal finance system, reconciling and invoicing from transactions pulled directly out of the Mercury, Wise and Stripe APIs into Xero, designed around zero missed transactions and explicit confirmation on anything ambiguous. A related bookkeeping flow cut a two-day monthly process to roughly 20 minutes.
- Run production infrastructure on AWS with encryption treated as a first-class concern: documents encrypted at rest in S3, keys managed through KMS, credentials in Secrets Manager. Sentry-based error triage feeds an automated pull-request workflow.
Stack: Next.js, TypeScript, Node.js, MongoDB, Redis, BullMQ, Stripe, AWS (S3, KMS, Secrets Manager), Docker, Sentry
Senior Frontend Engineer
UK Maritime B2B SaaS (confidential)
B2B platform used by shipowners and suppliers across the marine industry
- Build and maintain critical front-end modules for supplier vetting, compliance and procurement workflows on a platform serving international enterprise customers.
- Part of a small rapid-response group and the point of escalation for release blockers: critical fixes, root-cause work, and coordination with QA and back-end teams to get releases out on schedule.
- Improved how the team works, not just what it ships: built internal tooling that pulls task data from Asana and automates the create-and-start steps engineers were doing by hand.
- Long-running engagement, renewed continuously since 2024, on a codebase with strict performance and maintainability requirements.
Stack: Next.js, React, TypeScript, Redux, Context API, Styled Components, Jest, Asana, Agile
Senior React Engineer
EduKiwi School
- React, Next.js and GraphQL: built the platform from zero, a course and student management application with complex interactive interfaces, delivered as both web and mobile.
- React Native: shipped the mobile app to production on both stores, through Apple's review process to an approved App Store release and a Google Play release.
- Owned feature delivery end to end alongside bug triage and reporting in Jira.
Stack: React, Next.js, React Native, GraphQL, Tailwind CSS, JavaScript
Frontend Team Lead
Rental Marketplace (confidential)
- Led the front-end team: task breakdown and delegation, weekly planning, delivery tracking and keeping the project on schedule.
Stack: Next.js, React, TypeScript, Chakra UI
Senior Frontend Engineer
Education Platform (confidential)
- React, Redux and Tailwind: built a custom document management application along the lines of Google Drive, with drag-and-drop, folder creation, upload, delete, and sharing of individual files or entire folders, over a folder tree that updated in real time.
Stack: React, Redux, Tailwind CSS
Full Stack Engineer
Net Interaction
- Laravel, Vue.js and Livewire: built e-commerce platforms and internal tools, alongside concurrent freelance projects across e-commerce, healthcare and wellness.
- Shipped a promotional campaign module that unlocked seasonal ad campaigns the platform could not previously run, and rebuilt a patient-to-doctor communication flow for a medical services platform.
Stack: Laravel, Vue.js, Livewire, MySQL, Bootstrap, jQuery
Software Development Intern
Continental
Internship in software development while studying computer science at West-Universität Timișoara, working as part of a development team.
Software Development Intern
Nokia, Liga AC Labs
Internship through the Liga AC Labs program in Timișoara, with Nokia as a partner company, while studying computer science.
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Healthcare, Retail, Education, Automotive, and Telecommunication.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Product Development, and Project Management.
Summary
Senior product engineer who owns delivery as well as code. 6+ years shipping production web applications in TypeScript, React and Next.js, and the person teams escalate to when a release is at risk. I work as an embedded engineer and delivery lead for product teams and agencies, taking work from scoping and architecture through to release, running the planning and stakeholder communication around it, and making the call when nobody else is available to make it. Certified project manager alongside the engineering. I contract B2B through my own companies in the EU, the US and Serbia.
- Took a client site from 65 to 97 on mobile PageSpeed through caching architecture and Core Web Vitals work.
- Consistently deliver front-ends at 95+ Lighthouse, treating accessibility and performance as delivery criteria rather than cleanup.
- Cut a recurring bookkeeping process from two days to about 20 minutes per month with a purpose-built automation flow.
- Diagnosed and remediated a live production compromise on a client site, from detection through cleanup and credential rotation.
Skills
- Core: Typescript, Javascript, React, Next.Js, Node.Js
- Frontend: Tailwind Css, Styled Components, Chakra Ui, Redux, Context Api, React Native, Jest
- Backend & Data: Node.Js, Mongodb, Redis, Bullmq, Graphql, Rest, Mysql, Stripe
- Cloud & Infra: Aws (Ec2, S3, Vpc, Kms, Secrets Manager), Docker, Ci/Cd, Sentry, Vercel
- Practice: Claude Code, Agentic Coding Workflows, Context Engineering, Spec-Driven Development, Git Worktrees, Developer Tooling, Code Review, Agile/Scrum, Project Planning And Delivery Management
I Run An Ai-Native Delivery Process In Claude Code: Multiple Workstreams In Parallel Through Autonomous Coding Agents In Isolated Git Worktrees, Each Driven By A Written Spec With A Mandatory Plan-Before-Code Step And An Independent Review Gate Before Merge. The Hard Part Is Context Engineering Rather Than Prompting, Deciding What Each Agent Is Allowed To See And What The Repository Asserts As Ground Truth. The Practical Effect For A Client Is More Parallel Throughput At Production Quality, With A Written Trail Behind Every Decision Instead Of Tribal Knowledge. This Is How I Ship, Not A Side Experiment.
Languages
Education
West University of Timisoara
BA · Computer Science · Timișoara, Romania
Certifications & licenses
Google Project Management Professional Certificate
Coursera
Statistics
Experience
Global experience
Expertise
Qualifications
Frequently asked questions
Have questions? Find more information here.
Denis is based in Vršac, Serbia and can operate in on-site, hybrid, and remote work models.
Denis speaks the following languages: German (Native), Romanian (Native), English (Advanced), Serbian (Advanced).
Denis has at least 8 years of experience. During this time, Denis has worked in at least 6 different roles and for 8 different companies. The average length of individual experience is 1 year. Note that Denis may not have shared all experience and actually has more experience.
Based on recent experience, Denis would be well-suited for roles such as: Founder & Product Engineer, Senior Frontend Engineer, Senior React Engineer.
Denis's most recent position is Founder & Product Engineer at CodePixelfy (Estonia OÜ, Delaware LLC, Serbian DOO).
In recent years, Denis has worked for CodePixelfy (Estonia OÜ, Delaware LLC, Serbian DOO), UK Maritime B2B SaaS (confidential), EduKiwi School, Rental Marketplace (confidential), and Education Platform (confidential).
Denis is most experienced in industries like Information Technology, Healthcare, and Retail. Denis also has some experience in Education, Automotive, and Telecommunication.
Denis is most experienced in business areas like Information Technology, Product Development, and Project Management.
Denis has recently worked in industries like Information Technology, Healthcare, and Retail.
Denis has recently worked in business areas like Information Technology, Product Development, and Project Management.
Denis holds a Bachelor in Computer Science from West University of Timisoara.
Denis has 1 certificate: Google Project Management Professional Certificate.
Denis is immediately available part-time for suitable projects.
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Calculated based on our freelancers’ daily rates as of 7 Nov 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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