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Andrey Lappo — QA Engineer Portfolio
2,500+ issues filed. Manual QA | Documentation Testing | Localization QA

Andrеy Lаppo — QA Engineer Portfolio

Manual QA Engineer | Documentation Testing | Localization QA (Russian)

Quality Assurance Engineer with 5+ years of continuous testing across enterprise PDF software, mass-market messaging app (Telegram), and 380+ open source projects. 2,500+ issues filed. Specialized in exploratory testing, usability analysis, and finding edge cases that break real-world workflows.

LinkedIn: Gallem | GitHub: @Korb | Location: St Petersburg, Russia (Open to relocation: EU, North America, South America)

Table of Contents

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

  1. 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

  2. Auto-Remove Hyphenations: Export books to text without manual cleanup

    • Impact: Saved hours per 100+ page book
    • Skills: Workflow testing, real-world use cases

  3. "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

  4. Split Lines Beyond Page Edges: Visual improvement for page split guides

    • Impact: Much more visible, matches Adobe behavior
    • Skills: Comparative analysis, visual testing

  5. Broken Filename Macros: Batch processing overwrote files

    • Impact: Data loss risk in batch operations
    • Skills: Batch workflow testing, macro systems

  6. PDF-Tools Context Menu: Proposed unified Windows Explorer integration

    • Impact: Transformed batch processing UX (3-year implementation)
    • Skills: Product vision, feature specification

  7. Progress Bar for Search: Added ETA display for long operations

    • Impact: Users can now plan, know if frozen
    • Skills: Long-running operations, user psychology

  8. Batch Export Bug: Fixed mixed encoding in legacy MS Word files

    • Impact: Blocked batch processing of old archives
    • Skills: Legacy format handling, encoding issues

  9. Remove OCR Languages: Added uninstall for language packs

    • Impact: Disk space management, user control
    • Skills: Installation testing, missing features

  10. 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
Screenshot of Telegram General Questions FAQ page in light theme, illustrating reported bug where introductory welcome screen or help text fails to adapt to dark mode. Text covers app description, features like messaging, groups up to 200,000 members, encryption, and privacy options. Links to Tips Channel and blog mentioned.

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
Screenshot of Telegram channel management menu in dark mode, illustrating bug with red mute icon in submenu. Main menu options include Mute notifications, View channel info, Manage Channel, Create poll, Export chat history, Clear history, Leave channel. Submenu for mute duration: Select tone, Disable sound, Mute for 2 hours, Mute for…, Mute forever (highlighted in red). ͏ Screenshot of Telegram notification mute submenu in dark mode, illustrating bug where Mute Forever option uses red text and icon for emphasis. Options listed: Disable sound, Mute for…, Customize, with Mute Forever highlighted in red at bottom. Back arrow visible at top.

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
Screenshot of Telegram live location sharing dialog in dark mode, illustrating bug where header banner remains light blue. Prompt asks to choose duration for accurate location sharing: 15 minutes selected, 1 hour, or until turned off; with Cancel and Share buttons. Background shows map and attachment options.

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
Screenshot of Telegram context menu for a media item in dark mode, illustrating bug where menu background remains light gray instead of fully dark. Options listed: Reply, Copy Link, Save to downloads, Share, Forward, Pin, Rename, Edit, Delete. Partial view of colorful image in background. ͏ Screenshot of Telegram channel info panel in dark mode while sending a file, illustrating context for file rename request. Visible sections: blurred description waveform, Notifications toggle on, Members with Subscribers and Administrators. Bottom shows attached file The Birds (1963).avi (744.0 MB, dated 26.01.21 at 20:55) with green checkmark.

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

hr />

Screenshot of Telegram global search interface in dark mode, illustrating reported bug where thumbnails in search results remain light or poorly contrasted. Search bar with query, filters like All chats, Public, Private unchecked, Global search results with channel icons, and Found 600 messages section visible.

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
Screenshot of Telegram bot info panel in dark mode, illustrating incomplete theme application with light background in shared media counters (6 photos, 2 videos, 5 shared links) and some menu items. Options include Notifications toggle off, Add to Group, Delete chat, Report, Stop and block bot.

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/Linux), 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:

  1. Spectral Emulator: AVX2 Incompatibility (Critical crash)

    • Entire CPU generations excluded (pre-2013 Intel/AMD)
    • Skills: Hardware compatibility, CPU instruction sets

  2. RetroArch: ISO Crash (Critical)

    • Crash on ISOs without serial numbers (homebrew discs)
    • Skills: Edge case file formats, homebrew testing

  3. HomeMedkit: Data Loss Prevention (High severity)

    • Users losing medication data silently
    • Skills: Workflow analysis, form validation UX

  4. DocsAfterDark: Dark Theme Bugs (6 visual bugs)

    • Invisible checkmarks, unreadable text, cursor issues
    • Skills: Systematic UI testing, accessibility/contrast

  5. Locus: Location Features (3 feature requests, all implemented)

    • Real SAR scenarios: own track display, compass, offline buffering
    • Skills: Field testing, safety-critical apps

  6. Unison: UTF-8 Bug (Encoding bug)

    • Filename corruption for national characters
    • Skills: i18n testing, cross-platform encoding

  7. StreetComplete: Location Arrow (Visual bug)

    • Invisible direction arrow in dark theme
    • Skills: Field testing, OSM (OpenStreetMap) contribution

  8. 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
  • Example: 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

  1. Replace All Bug: First search result deleted — confirmed for next release
  2. Two Pages Mode Selection: Cannot select images across pages — investigating reproducibility
  3. OEM-855 Encoding: Legacy encoding not recognized — in queue

Accessibility Issues Under Investigation

  1. Dialog Focus: Save dialog appears without focus (keyboard navigation broken)
  2. 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 from 1,200+ manufacturers
  • Processed 100,000+ 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:

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.

Footnotes

  1. 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. ↩

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