We have code-writing conventions for all programming languages which we use. It is exact rule, used since company was founded. It gives many benefits, main of them:

	reducing probability to make a mistake in the code
	makes it easy to understand, fix & update code written by somebody else

Code-writing conventions includes:

	naming conventions, cases, offsets, formatting
	project, file/unit structure
	typical templates

Our coding experience described in the following rules:

	avoid code duplication
	proper understanding & selection which data structures should be used
	proper code position by level: local, class, unit, project, common library
	correct use of try / except / finally
	never hide exceptions - each exception should be either raised to higher level or logged for later review
	check parameters ASAP, use Exit, Assert, raise Exception
	max use of compiler to capture errors during compilation - use of enumerated types, typed params, avoid object typecasts
	run-time validation in initialization part
	self code documentation, readability - named constants, procedure size <= 1 page, use of local vars with proper names

Quality Assurance on the code level is based on the following principles.

	Code standardization We had developed and using special tools which check the code according to our experience, code conventions accordance and for typical errors - Code & HTML Checkers, SQL optimizer, and even INI files checker
	Common library Development is always faced with situations to have similar functions or classes in different projects. In order to consolidate such requests we are using approach to keep common library. Work on each project contributes to it. So now after about 10 years of development we have very solid, optimized and well tested common library which covers all aspects for programming on Windows platform. When we start development of new project(s) 80% is already done and resides in our common library. This increase development speed, decrease chance of mistakes, perfomance issues, avoids code duplication.
	Code review Some bugs can be found only through manual code review. That is especially true with errors related to algorithm or interaction between different application modules. The whole code written by a developer is later reviewed by more experienced supervisor. This also much improve professional level of developers.