Pownce Lessons Learned

Notes:	Hide Notes

Slide 2: Social messaging application Developed in 4 months Invite-only launch in June We’ve learned a lot ... Slide 3: Lesson: Think about technology choices • We could pick anything! • Social as well as technological reasons factored into our decisions • Took risks • Open to new technologies Slide 4: Why Django? Django is a Python web framework • • • • • Yay! Web frameworks! Documentation and readability Auto-generated admin Active community Framework open to growth Think about tech choices... Slide 5: Why S3? Amazon’s Simple Storage Service • • • • Pownce files are stored on S3 Less maintenance for Pownce Inexpensive Been very reliable so far Think about tech choices... Slide 6: Why AIR? Adobe Integrated Runtime • • • • Works on both PC and Mac Easy to develop Encourages good UI Lots of good buzz Think about tech choices... Slide 7: Lesson: Do a lot with a little • • • • Pownce has a tiny team One website developer Self-funded Short deadlines Slide 8: Small Teams We wear many shoes. • Multiple roles • Learn quickly • Dedicated Do a lot with a little... Slide 9: Open Source Tools Plenty of web application help • • • • Someone has solved this problem before ... and they’re probably smarter than me Lots of tools available Free to use Do a lot with a little... Slide 10: Use Your Resources Get some help. • • • • • Documentation websites IRC Network and learn from friends Exchange knowledge with other sites Participate in communities Do a lot with a little... Slide 11: Lesson: Be kind to your database • Pownce’s database is its main bottleneck • One MySQL database • Responding quickly to slow queries has helped keep Pownce running • Few simple tips... Slide 12: Caching: “I’ve already done that.” • We use memcached • Caching at page and object / list level • Cached our static pages since launch Be kind to your database... Slide 13: Queuing: “I’ll do that later.” • Taking a (shorter) note of a (longer) process to do later • We “send” notes via a job queue • Need to improve our queuing system and add more processes Be kind to your database... Slide 14: Limits and Pagination: “I don’t need to do ALL of that.” • Notes list, friends list, recipient lists... • Good user interface as well • Django Paginator object is a good starting point Be kind to your database... Slide 15: Index: “I’ll mark that to find it later.” • We had to re-think how we were accessing our data • Friend searching is a prime example of where good indexing can improve performance Be kind to your database... Slide 16: Avoid Complexity: “I won’t make the db do that.” • Some queries are just too complicated (for a new web app) • Consider if they’re actually NEEDED • Usually good to avoid abstract or conceptual data display Be kind to your database... Slide 17: [ JARRING CHORD ] Expect Anything! Slide 18: Lesson: Expect Anything • • • • Young sites can run into many problems Need to respond quickly Can’t prepare for everything Every web application is unique Slide 19: Keep Backups Because stuff happens. • • • • Use version control Have a system to revert code changes Track dependencies and updates made If developing locally, backup personal work Expect anything... Slide 20: Duly Noted: Keep lots of data. • Stats to monitor • Quantitative measures • Pretty graphs Expect anything... Slide 21: Community Keep in touch with your community. • Let users know what you’re working on • Respond to individual bug reporters • Inform users of bug fixes and new features • Be careful about asserting deadlines Expect anything... Slide 22: Friendships Matter Social sites are all about friends. • Strive to make it easy to establish, maintain or break relationships • Accurately represent user relationships • Online friends have real-world effects • Don’t mess this up! Expect anything... Slide 23: A feature that matters. (from Satisfaction) Expect anything... Slide 24: Prepare to Scale Up It’s a good problem to have. • • • • “Don’t prematurely optimize” ... unless you work with Kevin Rose Design for success Accept that your code will change Expect anything... Slide 25: Lessons Learned Think about technology choices Do a lot with a little Be kind to your database Expect anything Slide 26: Thanks!