Oleksii Bondarenko - Blockchain Developer (freelance)

Q: Where is Oleksii based?

Oleksii is based in Bern, Switzerland and can operate in on-site , hybrid , and remote work models.

Q: What languages does Oleksii speak?

Oleksii speaks the following languages: Russian (Native), Ukrainian (Native), English (Intermediate), Hebrew (Elementary), Italian (Elementary) .

Q: How many years of experience does Oleksii have?

Oleksii has at least 20 years of experience. During this time, Oleksii has worked in at least 11 different roles and for 13 different companies . The average length of individual experience is 2 years and 6 months . Note that Oleksii may not have shared all experience and actually has more experience.

Q: What is Oleksii's latest experience?

Oleksii's most recent position is Blockchain Developer (freelance) at Self-Employed .

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

In recent years, Oleksii has worked for Self-Employed , Sixt Systems / Allane , Skilld.fr , Alef Invest , and Private Entrepreneur Bondarenko Oleksii Oleksiyovych .

Q: Which industries is Oleksii most experienced in?

Oleksii is most experienced in industries like Information Technology , Healthcare , and Banking and Finance . Oleksii also has some experience in Construction , Real Estate , and Utilities .

Q: Which business areas is Oleksii most experienced in?

Oleksii is most experienced in business areas like Information Technology , Product Development , and Project Management . Oleksii also has some experience in Logistics , Sales , and Operations .

Q: Which industries has Oleksii worked in recently?

Oleksii has recently worked in industries like Information Technology , Banking and Finance , and Construction .

Q: Which business areas has Oleksii worked in recently?

Oleksii has recently worked in business areas like Information Technology , Product Development , and Project Management .

Recommended expert

Bern, Switzerland

Experience

Aug 2023 - Jan 2024

6 months

Blockchain Developer (freelance)

Self-Employed

Developed ERC20 smart contracts with a mechanism for vesting, including deployment, testing, and auditing.
Wrote a JavaScript application for managing transactions in Bitcoin, Ethereum, and SEPOLIA with a custom token.

Mar 2022 - Mar 2025

3 years 1 month

Software Engineer

Sixt Systems / Allane

Developed custom Drupal modules and implemented new websites on Drupal 9.
Upgraded Drupal 9 websites to Drupal 10, including database migration.
Configured GraphQL for efficient data retrieval by the front end.
Successfully launched multisites for mobility consulting and car fleets (7+ projects).
Worked closely with DevOps to support continuous deployment and release quality control.

Oct 2020 - Apr 2022

1 year 7 months

Software Engineer, Drupal

Skilld.fr

Implemented new Drupal 9 websites.
Automated content migration and supported existing functionality.
Communicated with clients and offshore teams, participated in code reviews, and planned releases.

Dec 2017 - Aug 2018

9 months

Software Engineer

EPAM Systems (Life Sciences & Healthcare)

Developed Drupal 8 components for the Care4Today medical platform.
Worked on API development and integration.
Wrote tests, performed code reviews, and provided CI/CD support.

Apr 2017 - Dec 2017

9 months

Senior Drupal + React Developer

Rawpixel (Photomorphic)

Developed backend using Drupal and frontend using React.
Implemented eCommerce modules, including Stripe and Taxamo.
Supported AWS infrastructure, including Terraform and SQS.

Jan 2016 - Mar 2017

1 year 3 months

Backend Developer

Youwe

Managed the migration of multisites from Magento to Drupal, ensuring seamless transfer of data and functionality and improving stability and security.
Developed custom modules for Drupal 7 and Drupal 8, including commercial multisites, helping to increase business value by adapting the product to customer requirements.
Provided regular security updates, maintaining compliance with GDPR and data protection standards.
Initiated and implemented training projects for Drupal beginners and developed a 3-month course from scratch to junior level, contributing to team building and increased work efficiency.
Created a bot module for integration with Facebook Messenger API (drupal_bot_builder), automating user interaction and improving UX and conversion.
Worked with the backlog, prioritizing tasks by business value and risk and applying Agile/Scrum methodologies.

Aug 2015 - Feb 2016

7 months

Backend Drupal Developer

OysterLabs (Sony Music)

Developed a Drupal 7 social platform for Sony Music Entertainment marketing events.

Mar 2015 - Aug 2015

6 months

Lead Drupal Developer

Master Of Code (Lifechurch)

Performed refactoring and functionality expansion of existing systems.
Developed and maintained a multisite system.

Jun 2014 - Mar 2015

10 months

Backend Drupal Developer

NXTE (Google, Sony)

Developed Drupal 7 websites and wrote custom modules.
Created JSON APIs for high-load projects.

Sep 2013 - Apr 2014

8 months

Consultant Salesperson and Logistician

Brain Store

Sold products and motivated employees.
Handled logistics, including unloading and placing goods on shelves and in shop windows.
Recorded promotional video content to increase sales and organized wholesale sales.
Established business relationships with partners, including Industrial Union of Donbas, Azovstal, and educational organizations.
Implemented innovative advertising using media clips at the Port City Shopping Center in Mariupol.

Jan 2011 - Dec 2014

4 years

Assistant Manager / Occupational Safety Engineer

United Energy Networks of Ukraine, MKP Symbol

Designed and approved the construction of power lines.
Supervised the connection of facilities to utility networks, including electricity, gas, water, and sewerage.

Jan 2006 - Dec 2025

20 years

Acting CEO / IT Product & Program Manager

Alef Invest

Responsible for P&L, product strategy, roadmap, release planning, backlog, and prioritization.
Coordinated DevOps, architects, and security; implemented agile processes and monitored task completion using KPIs.
Managed UX/graphic, PM, and marketing teams; worked with international partners.
Formulated epics and wrote technical requirements for back-end and mobile clients.
Managed a budget of up to €500,000 per year and a team of 10+ specialists (DevOps, UX, security, marketing).
Implemented AI automation of PR reviews, reducing release time by 40%.
Formulated product strategy and roadmap; planned and coordinated 6+ releases per year.
Defined epic "Car catalog" → user story "Automatic generation of SEO pages for 1080 cars" → acceptance criteria "100% of pages indexed by search engines, 35% increase in organic traffic in 3 months".
Prioritized the backlog according to RICE, accelerating development of key features and increasing user registrations by 20%.

Jan 2006 - Dec 2025

20 years

Economic Activity Without Registration as a Legal Entity

Private Entrepreneur Bondarenko Oleksii Oleksiyovych

Conducted business activities in the fields of construction, international trade, finance, healthcare, and real estate sales and rentals.

Industry Experience

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

Experienced in Information Technology, Healthcare, Banking and Finance, Construction, Real Estate, and Utilities.

Information Technology

Healthcare

Banking and Finance

Construction

Real Estate

Utilities

Business Area Experience

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

Experienced in Information Technology, Product Development, Project Management, Logistics, Sales, and Operations.

Information Technology

Product Development

Project Management

Logistics

Sales

Operations

Summary

Entrepreneurial IT Product Manager and Acting CEO with nearly 20+ years of experience in launching digital products (web & web3), managing cross-functional teams, and responsibility for technical, organizational, and financial results. Holds a master's degree in enterprise security and has practical experience in developing projects with security and confidentiality requirements. Focused on creating customer-centric mobile solutions that deliver business value.

Skills

Hard Skills: Solidity, Ethereum, Erc20, Erc1155, Bnb, Ton, Truffle, Javascript, Node.js, React, Next.js, Typescript, Php, Node.js, Python, Drupal 7-11, Graphql, Docker, Aws, Rest Api, Agile/scrum, Git, Ci/cd, Ux/ui Design, Terraform, Blockchain Smart Contracts, Ai Integration (Rag, Langfuse), Cms, Secure Pgp Email, Gdpr/dsgvo-compliance
Soft Skills: Communication, Leadership, Strategic Thinking, Perseverance, Effective Teamwork, Multilingualism, Team Motivation, Planning, And Priority Management.
Organizational: Team Management (Up To 20+), Release Planning (1+ Per Month), Budgeting (Up To €500k), Agile/scrum, Rice, And Wsjf For Prioritization.
Mobile: Development Of A Telegram Mini-app With On-chain Mechanics, Pwa On React, Integration Of Mobile Functions.
Kpi: Reduced Time-to-market From 8 To 4 Weeks, Increased Lead Conversion By 25%, Deployment Frequency – 1 Release Every 2 Weeks, Mttr – Up To 4 Hours.
Key Skills: Product Strategy • Roadmap & Release Planning • Backlog Prioritization (Rice/wsjf/moscow) • Kpi Definition • Agile/scrum • Devops Collaboration • Mobile Ux & Integration (Telegram Mini-app, Pwa Experience) • Web3 (Ton, Tact, Eth, Solidity, Rust, Bitcoin, Cardano) • Security & Compliance Awareness

Languages

Russian

Native

Ukrainian

Native

English

Intermediate

Hebrew

Elementary

Italian

Elementary

Education

National Aviation University, Institute of Information and Diagnostic Systems, Faculty of Telecommunications and Information

Master's degree (with honors), Administrative Management in Information Security; Research Associate: Security of Enterprises, · Information Security · Kyiv, Ukraine

Industrial and Economic College of the National Aviation University

Junior Specialist (with honors), Information Systems Automation, Computer Programming · Information Systems Automation and Computer Programming · Kyiv, Ukraine

Certifications & licenses

Driver License: B

Statistics

Experience

Total positions 13

Experience in Information Technology 20 y

Avg length 4 y 1 m

Longest experience 19 y 11 m

Expertise

Recent roles Blockchain Developer (freelance), Software Engineer, Software Engineer, Drupal

Main industries Information Technology, Healthcare, Banking and Finance

Main business areas Information Technology, Product Development, Project Management

Qualifications

Highest degree Master

Certifications earned 1

Profile

Created

October 2025

Last Update

November 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Oleksii based?

Oleksii is based in Bern, Switzerland and can operate in on-site, hybrid, and remote work models.

What languages does Oleksii speak?

Oleksii speaks the following languages: Russian (Native), Ukrainian (Native), English (Intermediate), Hebrew (Elementary), Italian (Elementary).

How many years of experience does Oleksii have?

Oleksii has at least 20 years of experience. During this time, Oleksii has worked in at least 11 different roles and for 13 different companies. The average length of individual experience is 2 years and 6 months. Note that Oleksii may not have shared all experience and actually has more experience.

What roles would Oleksii be best suited for?

Based on recent experience, Oleksii would be well-suited for roles such as: Blockchain Developer (freelance), Software Engineer, Software Engineer, Drupal.

What is Oleksii's latest experience?

Oleksii's most recent position is Blockchain Developer (freelance) at Self-Employed.

What companies has Oleksii worked for in recent years?

In recent years, Oleksii has worked for Self-Employed, Sixt Systems / Allane, Skilld.fr, Alef Invest, and Private Entrepreneur Bondarenko Oleksii Oleksiyovych.

Which industries is Oleksii most experienced in?

Oleksii is most experienced in industries like Information Technology, Healthcare, and Banking and Finance. Oleksii also has some experience in Construction, Real Estate, and Utilities.

Which business areas is Oleksii most experienced in?

Oleksii is most experienced in business areas like Information Technology, Product Development, and Project Management. Oleksii also has some experience in Logistics, Sales, and Operations.

Which industries has Oleksii worked in recently?

Oleksii has recently worked in industries like Information Technology, Banking and Finance, and Construction.

Which business areas has Oleksii worked in recently?

Oleksii has recently worked in business areas like Information Technology, Product Development, and Project Management.

What is Oleksii's education?

Oleksii holds a Master in Information Security from National Aviation University, Institute of Information and Diagnostic Systems, Faculty of Telecommunications and Information and a Bachelor in Information Systems Automation and Computer Programming from Industrial and Economic College of the National Aviation University.

Does Oleksii have any certificates?

Oleksii has 1 certificate: Driver License: B.

What is the availability of Oleksii?

Oleksii is immediately available part-time for suitable projects.

What is the rate of Oleksii?

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