Andrеy Lаppo — QA Engineer Portfolio
| Manual QA Engineer | Documentation Testing | Localization QA (Russian) |
Quality Assurance Engineer — 5+ years of continuous testing across 380+ open-source projects, filing 2,500+ issues; experience with enterprise PDF software and Telegram.. Specialized in exploratory testing, usability analysis, and finding edge cases that break real-world workflows.
| LinkedIn: Gallem | GitHub: @Korb | Location: St Petersburg, Russia ( |
Table of Contents
- Testing Expertise
- Featured Work
- Documentation & Localization
- Open Source Advocacy
- Work in Progress
- Professional Background
- Contact
Testing Expertise
- Manual QA Testing: Exploratory testing, regression testing, edge case discovery
- Documentation Testing: Technical docs, README files, user-facing text, help systems
- Localization QA (Russian): Interface translation, metadata, encoding issues
- Usability Analysis: Workflow friction, UX inconsistencies, terminology review
- Batch Processing Testing: Large-scale operations, testing automation tools (not automated testing)
- Cross-Platform Testing: Windows, Android, Web, Browser Extensions
- Edge Case Discovery: Testing at limits (high zoom, large datasets, legacy formats)
- Long-term Product Engagement: Sustained testing over years, deep product knowledge
Featured Work
PDF-XChange Pro (Deep Dive)
4+ years testing enterprise PDF software, Adobe Acrobat’s strongest competitor
Statistics:
- Product: PDF-XChange Pro (PDF-XChange Editor, PDF-Tools and PDF-XChange Print Drivers)
- Issues Filed: 250+ on PDF-XChange forum alone
- Implemented: 79 enhancements/fixes
- Acceptance rate: 69%
- Issue Types: 56 Enhancements, 59 UX/Usability, 33 Functionality bugs
- Duration: 4+ years continuous engagement
- Skills: Exploratory testing, usability analysis, batch processing, edge cases, workflow design, persistence on hard-to-reproduce bugs
Top 10 Implemented Improvements
| → See detailed case studies |
Brief Highlights
- Critical Search Hang: Multi-file search freezing for hours → Fixed after investigation
- Impact: Blocked entire workflow, hours lost
- Skills: Hard-to-reproduce bugs, persistence with developers
- Auto-Remove Hyphenations: Export books to text without manual cleanup
- Impact: Saved hours per 100+ page book
- Skills: Workflow testing, real-world use cases
- “Crawling” Selection Bug: Crop tool drifted at high zoom
- Impact: Precision work impossible at 400%+ zoom
- Skills: Pixel-level precision, edge conditions, week-long investigation
- Split Lines Beyond Page Edges: Visual improvement for page split guides
- Impact: Much more visible, matches Adobe behavior
- Skills: Comparative analysis, visual testing
- Broken Filename Macros: Batch processing overwrote files
- Impact: Data loss risk in batch operations
- Skills: Batch workflow testing, macro systems
- PDF-Tools Context Menu: Proposed unified Windows Explorer integration
- Impact: Transformed batch processing UX (3-year implementation)
- Skills: Product vision, feature specification
- Progress Bar for Search: Added ETA display for long operations
- Impact: Users can now plan, know if frozen
- Skills: Long-running operations, user psychology
- Batch Export Bug: Fixed mixed encoding in legacy MS Word files
- Impact: Blocked batch processing of old archives
- Skills: Legacy format handling, encoding issues
- Remove OCR Languages: Added uninstall for language packs
- Impact: Disk space management, user control
- Skills: Installation testing, missing features
- Sync OCR Settings: Eliminated repeated language configuration
- Impact: Workflow efficiency, consistency
- Skills: Cross-feature testing, user expectations
Skills Demonstrated
- Long-term product engagement (4+ years)
- Batch processing & workflow testing
- Legacy format handling, encoding issues
- Persistence on hard-to-reproduce bugs
- Real-world large-scale testing (1000+ file collections)
- Feature design thinking
Telegram Messenger (Community Impact)
5+ years, mass-market messaging app (400M+ users)
Platform: bugs.telegram.org — community suggestion platform with voting system
Statistics:
- Total Issues: 308
- Project:
- Cross-platform: 84
- Telegram Desktop: 124
- Telegram for Android: 100
- Issue Types:
- Enhancement: 143 (47%)
- UX & Usability: 100 (32%)
- Layout & Design: 23
- Functionality: 26
- Others: 16 (Accessibility, Security, Performance, etc.)
- Implemented: 11 features/fixes1
- Community Validation: Multiple suggestions with up to 90 user votes
Implemented Improvements
1. Text Formatting as Quote (#1361)
- Type: Enhancement
- Impact: Added fundamental text formatting option used daily by millions
- Use Case: Replying to specific parts of messages in discussions
Click to see screenshot from issue explanation
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2. Allow Quotes to be Collapsed (#48496)
- Type: Enhancement
- Impact: Improved readability of long posts with multiple quotes
- Demonstrates: Thinking about further improving the previous function for special cases
3. HEVC Video Upload Support (#29058)
- Type: Functionality
- Impact: Modern codec support, smaller file sizes for same quality
- Technical: Cross-platform codec compatibility
4. Archived Chats Search Visibility (#17178)
- Type: Functionality Bug
- Impact: Archived chats were invisible in search, breaking user expectations
- Demonstrates: Finding non-obvious workflow issues
5. Video Size Limit Notifications (#48453)
- Type: Error Handling
- Impact: Users no longer waste time uploading videos that will be rejected
- UX: Proactive error prevention vs reactive error messages
6 and 7. UI Labels: “Mute” → “Notifications” (#19393, #19394)
- Type: UX & Usability (2 related issues)
- Impact: Clearer terminology — “Mute” is a special case, unlike “Notifications” — a general category that increments all actions combined in a submenu, including “Mute”
- Demonstrates: Microcopy/terminology thinking
Click to see screenshots
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8. Real-time Location Sharing Until Disabled (#2154)
- Type: Enhancement
- Impact: Currently, location sharing expires after maximum 8 hours, forcing manual renewal. This creates gaps in coverage and unreliable tracking for safety-critical or extended-duration scenarios. An “until turned off” option would provide seamless, continuous sharing aligned with user expectations from similar platforms.
- Use Case: Search and rescue coordination, parental monitoring, family/close contacts awareness, extended outdoor activities, and elderly care
Click to see screenshot
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9. Return to Original Message After Forwarding (#17491)
- Type: UX & Usability
- Impact: Eliminated disorientation after forwarding—automatically returns to context
- Workflow: Common action (forward) → smooth continuation
10. “Play Cached Music Only” Mode (#2305)
- Type: Enhancement
- Impact: Data-saving mode for users with limited mobile data
- Demonstrates: Understanding diverse user contexts (data constraints)
11. “Stop and Block Bot” in Search Results (#3239)
- Type: UX & Usability
- Impact: Simplified bot management—action available directly from search
- Workflow: Reduced steps for cleaning task
Top-10 by Community Votes
These suggestions received up to 90 votes, demonstrating understanding of widely-felt pain points
1. Drag & Drop Chats to Folders (#1208) — 90+ votes
- Intuitive organization method matching user expectations from file managers
- Currently: manual folder assignment through main Settings menus
2. “Schedule Message” in Share Menu (#2717) — 40+ votes
- Extend scheduling feature to external shares, not just in-app messages
- Use case: Share from browser → schedule for later
3. Send Videos as Videos, Not Documents (#2192) — 30+ votes
- Fix: Videos from certain sources default to “document” format
- Impact: Proper playback preview instead of download-only (and then switching to another app to watch the video)
4. Opt-out of Link Previews (#3195) — 30+ votes
- User control: Disable automatic link preview fetching
- Privacy: Prevent revealing visited sites to link preview servers
5. Rename Uploaded Files (#1176) — 30+ votes
- Edit filenames before/after upload
- Use cases: Generic camera filenames → descriptive names; fixing names corrupted by Telegram’s upload manager (#1209)
Click to see screenshots
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6. Add Media to Previously Sent Messages (#2750) — 20+ votes
- Edit message to include image/video after sending
- Matches modern messaging expectations
7. EXIF Data Control When Sending Photos (#1411) — 20+ votes
- Privacy: Choose to strip or keep location/camera metadata
- Use case: Share photos without revealing location
8. Text Notes for Groups/Channels/Bots (#2835) — 20+ votes
- Personal notes attached to any chat (visible only to you)
- Use case: Context about why you joined, project details, etc.
9. Global Search Filters (#2916) — 20+ votes
- Filter by: “Where I’m owner/admin”, “Public/Private”
- Power user feature for managing many groups/channels
Click to see screenshot
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10. Show Folders Containing Each Chat (#1114) — 15+ votes
- Display which folder(s) include current chat in chat properties
- Organization: Know where chat lives in your folder structure
Click to see screenshot
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Skills Demonstrated
Mass-Market App Testing:
- Consumer-facing features (400M+ users)
- Cross-platform thinking (Desktop, Android, iOS considerations)
- Diverse user contexts (data limits, privacy needs, power users)
Community Engagement:
- Voting system participation (identifying widely-felt issues)
- Understanding pain points that resonate with thousands of users
- Feature requests that receive 50-100+ community votes
UX & Enhancement Focus:
- 47% Enhancement suggestions (improving existing features)
- 32% UX/Usability improvements (workflow optimization)
- Terminology/microcopy thinking (renaming “Mute” to “Notifications”)
Workflow Analysis:
- Identifying multi-step processes that could be streamlined
- Error prevention (video size limits) vs error handling
- Context preservation (return to message after forwarding)
Platform Understanding:
- bugs.telegram.org is a community suggestion platform, not a traditional bug tracker
- Acceptance rate (~3-4%) is typical for mass-market apps with high suggestion volume
- Many suggestions remain “open” even when implemented—platform maintenance limitation
GitHub Open Source (Breadth)
5+ years. Demonstrating breadth: testing across 380+ repositories in last 2 years
Statistics:
- 2025: 900 contributions (368 repos) — 75% Issues, 9% PRs, 15% Commits, 1% Code review
- 2024: 578 contributions (305 repos)
- 2023: 169 contributions (113 repos)
- Total: 1,191 contributions across diverse projects
Top 8 Issues Across Diverse Projects
| → See detailed case studies |
Summary Statistics
- Total GitHub Contributions: 1,191 (380 repos in 2024-2025 alone)
- Types: Crash bugs, UI/UX issues, localization, documentation, compatibility
- Platforms: Desktop (Windows), Mobile (Android), Web, Browser Extensions
- Skills: Exploratory testing, cross-platform, i18n, accessibility, real-world scenarios
- Approach: Systematic testing, diverse test data, field testing, edge case discovery
Brief Highlights:
- Spectral Emulator: AVX2 Incompatibility (Critical crash)
- Entire CPU generations excluded (pre-2013 Intel/AMD)
- Skills: Hardware compatibility, CPU instruction sets
- RetroArch: ISO Crash (Critical)
- Crash on ISOs without serial numbers (homebrew discs)
- Skills: Edge case file formats, homebrew testing
- HomeMedkit: Data Loss Prevention (High severity)
- Users losing medication data silently
- Skills: Workflow analysis, form validation UX
- DocsAfterDark: Dark Theme Bugs (6 visual bugs)
- Invisible checkmarks, unreadable text, cursor issues
- Skills: Systematic UI testing, accessibility/contrast
- Locus: Location Features (many feature requests, all implemented)
- Real SAR scenarios: own track display, compass, offline buffering
- Skills: Field testing, safety-critical apps
- Unison: UTF-8 Bug (Encoding bug)
- Filename corruption for national characters
- Skills: i18n testing, cross-platform encoding
- StreetComplete: Location Arrow (Visual bug)
- Invisible direction arrow in dark theme
- Skills: Field testing, OSM (OpenStreetMap) contribution
- FacilMap: Browser Setting Conflict (Compatibility)
- Broken rendering due to obscure browser accessibility setting
- Skills: Troubleshooting environmental issues, browser diversity
Skills Demonstrated:
- Exploratory testing across diverse projects
- Cross-platform (Desktop, Mobile, Web, Extensions)
- Various domains (emulators, maps, productivity, healthcare)
- Real-world scenarios (SAR, field mapping)
- Internationalization (encoding, UTF-8)
Documentation & Localization
Translation Work (70+ apps):
- Scope: Full applications (mobile, desktop, device firmware), app metadata (F-Droid/IzzyOnDroid), UI strings, changelogs, feature descriptions, help documentation
- Platforms: Weblate, Crowdin, GitHub
- Languages: Russian, English
- Examples:
- The Healthy Battery Charging app has been fully translated into Russian.
- The translation of the SCEE application into Russian has been completed (131 of 648 strings)
- The translation of the MediTrak app into Russian has been completed (85 of 222 strings)
- Obtainium PR with formatting improvements
README Improvements (100+):
- Added screenshots: 15+ projects
- Fixed dark theme logos: 5+ projects
- Corrected app naming inconsistencies: 10+ projects
- Added missing documentation sections (uninstall instructions, language support)
Open Source Advocacy
F-Droid/IzzyOnDroid Ecosystem:
- 200+ contributions
- Encouraged 70+ developers to add screenshots
- Advocated for Per-App Language Selector in 15+ apps
- Helped 7+ developers publish to F-Droid
- Added and fixed Fastlane metadata structures, including platform-specific requirements
- Identified and documented F-Droid/IzzyOnDroid differences for developers
Work in Progress
100+ PDF-XChange issues currently under review—showing most notable pending cases. Hundreds of issues on GitHub, GitLab, and Codeberg waiting for their turn.
Confirmed Bugs Awaiting Fix
- Replace All Bug: First search result deleted — confirmed for next release
- Two Pages Mode Selection: Cannot select images across pages — investigating reproducibility
- OEM-855 Encoding: Legacy encoding not recognized — in queue
Accessibility Issues Under Investigation
- Dialog Focus: Save dialog appears without focus (keyboard navigation broken)
- Context Menu Focus: Menu appears but items not keyboard-accessible
Professional Background
Content Manager (2021-2024)
Medical equipment e-commerce platform
Key Achievements:
- Created documentation management system for 50,000+ products / 1200+ brands
- Processed 500,000+ documents: digitization, OCR, metadata, deduplication
- Developed PDF protection mechanism saving $15,000 annually
- Established workflow for translators/editors, improving efficiency 40%, reducing delays 65%
- Set up automated competitor price parsing
- Created wiki with 60+ articles
- Proofread, edited, and made layouts for 553 articles in corporate blog
- Standardized 10 years of inconsistent content, improving readability and professionalism
Skills: Technical documentation, content management, batch processing testing, workflow design
Search & Rescue Service (2011-2019)
Municipal lifeguard, 8+ years
Certifications: Professional Diver (Grade 5), Industrial Climber, First Aid, Wilderness First Responder Field Experience: 15+ SAR operations, 65+ public event safety duties Recognition: 6 commendations, 4 diplomas, medal from Russian Emergencies Ministry
Relevant to QA: Real-world testing under pressure, attention to detail in life-safety scenarios, field testing experience
Technical Proofreader (2009-2011)
Technical documentation for military equipment
- Proofread 800+ standard pages monthly of Russian-English-Spanish technical documentation
- Worked with SDL Trados translation memory system
- Specialized in military equipment manuals (security clearance required)
Note: Portfolio samples unavailable due to confidentiality
Skills: Technical proofreading, translation QA, SDL Trados
Technical Skills
Operating Systems:
- Windows (advanced)
- Android Tools:
- Excel/Google Sheets (advanced formulas)
- Git/GitHub
- SDL Trados
- OCR software Testing Types: Exploratory, usability, regression, localization, accessibility, cross-platform, batch processing Documentation: Technical writing, README creation, user guides, translation Languages: HTML, Markdown, BBCode Domains: PDF workflows, batch processing, file formats, encoding/UTF-8, maps/GIS, messaging apps
Contact
Open to:
- Remote QA Engineer positions (worldwide)
- On-site positions in EU, North America, South America
- Contract / Part-time / Full-time
Preferred Roles:
- Manual QA Engineer / QA Tester / Quality Assurance Analyst
- Documentation Testing Specialist
- Localization QA Specialist (Russian)
- Technical Writer with QA focus
Links:
- Professional
- LinkedIn: Andreу Laрpo
- GitHub: @Korb
- Additional Repositories
- GitLab: @Nia_Ward
- Codeberg: @Otto_Ball
- Translation Profiles:
- Weblate: Lowri_Olsen
- Crowdin: @Niyah_Atkins
Email: available on LinkedIn
This portfolio demonstrates 4+ years of professional-grade QA work through consistent, high-quality contributions to enterprise software, mass-market applications, and open source projects.
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the bugs.telegram.org platform is not always maintained up-to-date by developers. Many implemented features remain marked as “open” in the system. The 11 officially confirmed implementations listed above were verified through actual feature releases. ↩