Jan Ivanisevic - Senior Software Engineer — Ai-Ready Full Stack Systems

Q: Where is Jan based?

Jan is based in Warszawa, Poland .

Q: What languages does Jan speak?

Jan speaks the following languages: English (Advanced), Polish (Intermediate) .

Q: How many years of experience does Jan have?

Jan has at least 11 years of experience. During this time, Jan has worked in at least 6 different roles and for 5 different companies . The average length of individual experience is 2 years and 10 months . Note that Jan may not have shared all experience and actually has more experience.

Q: What is Jan's latest experience?

Jan's most recent position is Senior Software Engineer at MyFreeApp .

Q: What companies has Jan worked for in recent years?

In recent years, Jan has worked for MyFreeApp , Self Employed , and Exoft .

Q: Which industries is Jan most experienced in?

Jan is most experienced in industries like Information Technology , Food and Beverage , and Banking and Finance . Jan also has some experience in Professional Services .

Q: Which business areas is Jan most experienced in?

Jan is most experienced in business areas like Information Technology , Product Development , and Quality Assurance . Jan also has some experience in Operations .

Q: Which industries has Jan worked in recently?

Jan has recently worked in industries like Information Technology and Professional Services .

Q: Which business areas has Jan worked in recently?

Jan has recently worked in business areas like Information Technology , Product Development , and Quality Assurance .

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Warszawa, Poland

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Experience

Jan 2024 - Nov 2024

11 months

Remote

Senior Software Engineer

MyFreeApp

Built and maintained application features across full-stack workflows for a remote product environment.
Integrated external services into existing systems using API-driven patterns and clear data contracts.
Supported AI-ready feature paths by structuring application flows for automation and third-party service connectivity.
Tested new features across frontend and backend boundaries before release.
Documented technical behavior and implementation notes for maintainability and team handoff.

Dec 2022 - Jan 2024

1 year 2 months

Full Stack / AI Integration Consultant

Self Employed

Delivered contract software engineering work across frontend, backend, and API integration tasks.
Prototyped service integrations that could support conversational AI and voice automation workflows.
Connected application logic with external APIs while managing validation, error handling, and configuration.
Performed testing and defect resolution for client-facing software features.
Prepared technical documentation for setup, handoff, and ongoing maintenance.

Jan 2020 - Dec 2022

3 years

Full Stack Developer

Exoft

Developed full-stack software features using JavaScript-based interfaces and backend service integrations.
Implemented API-connected modules with clear request handling, validation, and response management.
Improved existing application areas by refactoring integration logic and reducing coupling between components.
Supported QA activities through troubleshooting, regression checks, and defect fixes.
Collaborated with remote stakeholders to clarify requirements and deliver maintainable software changes.

Oct 2018 - Jan 2020

1 year 4 months

Frontend Developer

Exoft

Built user-facing web application features using JavaScript and component-based frontend practices.
Integrated frontend modules with backend APIs and handled data loading, validation, and error states.
Participated in testing and bug fixing for application releases.
Worked with backend engineers to align UI behavior with API contracts.
Maintained reusable frontend code patterns for future feature development.

Sep 2015 - Oct 2018

3 years 2 months

Software Engineer

Diageo

Developed internal software features and supported application maintenance for business workflows.
Built API-connected functionality and handled data validation across application modules.
Supported troubleshooting, testing, and release preparation for production systems.
Worked with stakeholders to translate business needs into practical technical changes.
Documented changes and technical behavior for internal engineering reference.

Aug 2013 - Jun 2015

1 year 11 months

Junior Software Engineer

ING

Implemented junior-level software features under established engineering standards.
Assisted with frontend and backend maintenance tasks, bug fixes, and release support.
Worked with databases, application logic, and basic API-connected workflows.
Participated in testing and defect reproduction to support stable releases.
Built foundational experience in structured software delivery, documentation, and team collaboration.

Industry Experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Food and Beverage, Banking and Finance, and Professional Services.

Information Technology

Food and Beverage

Banking and Finance

Professional Services

Business Area Experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, Quality Assurance, and Operations.

Information Technology

Product Development

Quality Assurance

Operations

Summary

Senior Software Engineer with long-term experience across full-stack development, backend services, and remote product delivery. Relevant to Voice AI projects through API integration, application work, backend patterns, testing, and documentation. Experienced in improving existing systems, connecting external services, and supporting production software workflows. Can contribute to ElevenLabs-based voice bot projects through integration work, conversational workflow support, and QA validation. Works well independently while collaborating with distributed engineering and product teams.

Skills

Ai / Voice: Voice Ai Integration Patterns, Elevenlabs-Style Apis, Conversational Workflow Integration, Ai Service Connectivity
Backend: Rest Apis, Backend Services, Integration Layers, Authentication, Data Validation
Frontend: React, Javascript Ui Development, Product Workflow Integration
Testing / Qa: Integration Testing, Api Validation, Regression Support, Defect Resolution
Delivery: Remote Collaboration, Technical Documentation, Stakeholder Communication, Agile Implementation

Languages

English

Advanced

Polish

Intermediate

Education

Jan 2009 - Jan 2013

Lodz University of Technology

Bachelor's Degree · Computer Science · Poland

Statistics

Experience

Total positions 6

Experience in Information Technology 6 y

Avg length 1 y 10 m

Longest experience 3 y 1 m

Expertise

Recent roles Senior Software Engineer, Full Stack / AI Integration Consultant, Full Stack Developer

Main industries Information Technology, Food and Beverage, Banking and Finance

Main business areas Information Technology, Product Development, Quality Assurance

Qualifications

Highest degree Bachelor

Profile

Created

July 2026

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Frequently asked questions

Have questions? Find more information here.

Jan is based in Warszawa, Poland.

Jan speaks the following languages: English (Advanced), Polish (Intermediate).

Jan has at least 11 years of experience. During this time, Jan has worked in at least 6 different roles and for 5 different companies. The average length of individual experience is 2 years and 10 months. Note that Jan may not have shared all experience and actually has more experience.

Based on recent experience, Jan would be well-suited for roles such as: Senior Software Engineer, Full Stack / AI Integration Consultant, Full Stack Developer.

Jan's most recent position is Senior Software Engineer at MyFreeApp.

In recent years, Jan has worked for MyFreeApp, Self Employed, and Exoft.

Jan is most experienced in industries like Information Technology, Food and Beverage, and Banking and Finance. Jan also has some experience in Professional Services.

Jan is most experienced in business areas like Information Technology, Product Development, and Quality Assurance. Jan also has some experience in Operations.

Jan has recently worked in industries like Information Technology and Professional Services.

Jan has recently worked in business areas like Information Technology, Product Development, and Quality Assurance.

Jan holds a Bachelor in Computer Science from Lodz University of Technology.

Jan is immediately available full-time for suitable projects.

Jan's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.

To hire Jan, click the Meet button on the profile to request a meeting and discuss your project needs.