Anniversary Tracker
The flagship relationship tracker for anniversaries, countdowns, and meaningful milestones.
Cong Le
iOS Developer & Technical Lead @ Capital One
Download Anniversary Tracker11+ years in iOS. Enterprise banking by day, indie apps by night. Gravitating towards the positive.
I like building things, and learning anything that helps me build faster.
11+ YearsExperience
50+Apps
500k+Downloads
Try an app
A few useful places to start
Explore a small selection of apps I actively maintain, then follow through to the store page for your device.
Football Career Quest
Build a full football career from first prospect to club legend.
Prime Minister Sim: Politics
You're the new Prime Minister. The last government imploded on live television, Downing Street is yours, and the entire
Hoop Quest: Basketball Sim
Build a basketball career from backyard prospect to pro league legend.
Ollama Connect
A private chat client for Ollama on iPhone.
Baby Screen Lock: Kid Safe
Keep your little one entertained with age-appropriate activities while the screen stays locked.
Solunar: Best Fishing Times
Predict major and minor feeding periods with proven solunar theory for the best fishing times.
About
I'm an iOS developer with 11+ years building iPhone apps — Technical Lead for mobile at Capital One by day, indie app developer by night.
Outside of work I've shipped 50+ apps to the App Store. The one closest to me is Anniversary Tracker (250k+ downloads), which I build with my wife.
I like building things, and learning anything that helps me build faster. My mantra is to gravitate towards the positive — I'd describe myself as relaxed, diligent, and genuinely passionate about creating intuitive mobile experiences and solving hard technical problems.
Developer notes
Practical notes from building with AI
I write about the engineering systems behind a large iOS app portfolio: agent instructions, reusable knowledge, testing, and the lessons that hold up in real projects. The full developer articles live on PocketGrove, alongside the apps they help ship.
Stop putting everything in CLAUDE.md
A practical way to separate always-on project rules from task-specific agent skills.
Read the essayBuild huge agent knowledge bases without huge context windows
How layered references and retrieval keep large engineering knowledge useful.
Read the essayYour CLAUDE.md needs tests too
Treat agent instructions like executable project behaviour: test them, audit them, and keep them current.
Read the essay60 apps currently on the App Store
Browse the Portfolio
A focused collection of consumer iOS apps across utility, productivity, and lifestyle categories.
Anniversary Tracker
UtilitiesThe flagship relationship tracker for anniversaries, countdowns, and meaningful milestones.
4.7250k+
Download
Baby Screen Lock: Kid Safe
EntertainmentKeep your little one entertained with age-appropriate activities while the screen stays locked.
Hoop Quest: Basketball Sim
EntertainmentBuild a basketball career from backyard prospect to pro league legend.
LovePet: Pookie & Couple App
LifestyleStay connected with your partner through shared virtual pets, mood tracking, and daily love notes.
Kids Timer - Visual Countdown
ProductivityVisual routine timers designed to help kids stay focused and independent.
Solunar: Best Fishing Times
UtilitiesPredict major and minor feeding periods with proven solunar theory for the best fishing times.
Jump Rope Timer & Tracker
LifestyleA clean interval timer and workout log built for skipping and jump rope training.
Link Saver - fast and easy
UtilitiesLightweight link manager to quickly save and organize useful URLs.
Life Countdown: Age Calculator
UtilitiesSee your life in weeks and know exactly how much time you have left.
Golden Hour: Light Planner
Photo & VideoKnow exactly when the light gets good — every golden hour and light window a photographer needs.
Captions: Auto Video Subtitles
Photo & VideoAuto-transcribe your videos into subtitles in 30 seconds, not 30 minutes.
HouseholdVault: ID Docs
UtilitiesA private document scanner wallet for the records your household needs when timing matters.
Pack Planner: Group Lists
UtilitiesPack together from one shared checklist for families, friends, and travel groups.
Tiny Table: BLW Ideas & Purees
UtilitiesStart solids with practical baby-led weaning, puree, and finger-food prep ideas.
Persona AI: Story Chat
EntertainmentA private AI writing and story chat app for scenes, dialogue, and recurring characters.
CardKeeper – Wallet Passes
UtilitiesThe privacy-first way to create and manage Apple Wallet passes for loyalty and membership cards.
UV Index - Burn Time Tracker
WeatherKnow your personal burn time before you step outside, from clear-sky ultraviolet levels.
Moon Phases: Lunar Tracker
UtilitiesSee what the moon is doing right now in under a second — no internet required.
Baby Names : Swipe & Pick
LifestyleSwipe through 10,000+ baby names from 60+ cultural origins and match with your partner.
Kids Coloring Book & Draw
EducationColour, draw, and create with a kids-first colouring app. Fully offline.
Bible Prayer Companion
EducationA quiet, offline prayer and Scripture app built for simple daily consistency.
Passport Photo: Visa & ID
Photo & VideoCreate passport, visa, and ID photos that meet official government standards — processed on device.
Fish Finder · AI Identifier
LifestyleIdentify fish species with AI and keep useful details close while outdoors.
CardDex: TCG Scanner & Price
UtilitiesYour ultimate Pokémon card collecting companion — scan, track, and price your collection.
Sun Times: Sunrise & Sunset
WeatherKnow exactly when the sun rises and sets, to the minute, offline, anywhere on Earth.
VidCompress - Video Compressor
Photo & VideoCompress large videos quickly while keeping quality good enough to share.
Photo Cleaner & Compressor
Photo & VideoClean up your photo library and reclaim storage — all processed privately on your device.
Birthday Reminder & Countdowns
ProductivitySmart birthday reminders with countdowns so important dates never slip.
Learn Japanese
EducationBuild Japanese vocabulary and daily language habits with bite-sized practice.
UV Index Widget & Burn Time
WeatherKnow your personal burn time before you step outside. Add the UV Index widget to your Home Screen, get a sunscreen remin
Okaeshi: Return Gift Tracker
UtilitiesIn Japan, when you receive a gift for a wedding, a new baby, or a condolence, you're expected to send a return gift — ca
Checklist To Do - One Focus
UtilitiesA single todo list. It's either completed or not. Tap to complete and tap when you need to do it again. No thrills, stra
Card Log Pose
UtilitiesTrack every card, know its true value, and build winning decks — all in one app made for English-language trading card g
Live Captions HearBee
UtilitiesSee nearby speech as large, easy-to-read captions. Live Captions HearBee is built for Deaf and hard-of-hearing people, w
Prime Minister Sim: Politics
EntertainmentYou're the new Prime Minister. The last government imploded on live television, Downing Street is yours, and the entire
BingeFree: Recovery Companion
LifestyleBingeFree is a calm, mascot-guided companion for binge eating recovery — built around AVRT (Addictive Voice Recognition
Oval Office President Sim
EntertainmentYou're the new President. The last administration imploded live on cable news, the Oval Office is yours, and the entire
Professional Journey
11+ years across iOS engineering, architecture leadership, and product delivery.
Current Role Jul 2026 - Present
Technical Lead — Manager Associate (SDE4)
Capital One|Nottingham, UK
- Tech lead of a high-performing cross-functional team, owning technical direction and delivery.
- Lead engineer on the mobile app rebuild — modular architecture.
- Built internal platforms and tooling that acted as force multipliers, accelerating delivery across multiple teams.
- Drove systemic CI/CD and automated-testing improvements, raising release quality and engineering velocity org-wide.
Swift 6SwiftUIArchitectureDependency InjectionConcurrency
Past Dec 2021 - Jul 2026
Principal iOS Engineer
Capital One|Nottingham, UK
- Led architecture modernization across a large iOS codebase.
- Drove delivery across product, design, and QA in a regulated environment.
- Raised engineering quality through testing, CI/CD, and team standards.
- Mentored engineers and shaped technical direction for long-term scalability.
SwiftSwiftUIUIKitArchitectureCI/CD
Past 2019 - 2021
Career Break
Travel & Teaching
- Took a break from engineering to travel for 18 months.
- Taught English as a second language for a year.
TravelTeaching (ESL)
Past 2015 - 2018
Senior iOS Engineer
Capital One|London, UK
- Built and shipped core banking features used by large customer cohorts.
- Partnered across disciplines to maintain reliability and release quality.
Objective-CSwiftJenkinsTDD