This format might help you ...
Dear Sir,
I have being associated with x y z Ltd. since 01.01.2009.
(tasks / projects / assignment history)
Initially, I started with a role as of .. developer, took up tasks like x y z , xyz application for various functionality of … and recently I have been working on …. xyz related request and complains.
Simultaneously I moved to work on … and …. during implementation project,
(recent / present tasks)
Recently I was also involved in IT consultancy project.
All the regular requests and maintenance are carried out effectively by me and the team members within the team.
(other skill n management point)
In addition to these contributions, I have greatly improved my technical knowledge, managerial aspect and other skills critical to my work.
(self evaluation aspect)
Based on the feedback that I have received and on self evaluation with the roles and responsibility of similar nature, I feel the compensation part (salary) should be reviewed and revised.
(appreciation and acknowledging)
I would like reiterate that x y z as an organization and your guidance have provided me a platform where in I have gained immense practical knowledge, analytic and managerial skill while performing my ever growing roles and responsibility over the period of time.
I request you consider my request. Awaiting your response.
Sincerely,
A B C