In my last position, where I worked as a Bbackend Ddeveloper, my main responsibilities where understanding the project requirements, discussing possible solutions and delivering clean, realible and maintainable code. In my last position, where I worked as a backend developer, my main responsibilities were understanding the project requirements, discussing possible solutions and delivering clean, realible and maintainable code.

I wouldn't capitalise "backend developer" anymore than I'd capitalise "doctor", "engineer", "nurse", etc Only capitalise proper nouns --> the names of specific people, places, or things (eg. James, London, the World Health Organisation) OR: "In my last position I worked as a backend developer, and my main responsibilities were understanding the project requirements, discussing possible solutions and delivering clean, realible and maintainable code."

In my last position, I worked as a Bback-end Ddeveloper, and my main responsibilities where understanding the project requirements, discussing possible solutions, and lastly delivering clean, realiable, and maintainable code. In my last position, I worked as a back-end developer, and my main responsibilities were understanding the project requirements, discussing possible solutions, and lastly delivering clean, reliable, and maintainable code.

We don't typically capitalize job titles. "I worked as a..." and "my main responsibilities were..." are complete sentences by themselves, so a comma by itself isn't strong enough to connect them into a single sentence. I added "and" to make it strong enough. While this does depend a bit on what style guide you follow (important if you're doing formal writing for work), but in general it's a good idea to use the Oxford comma with lists of items, so I added it in here. You have a second list as part of the first list, so I added the word "lastly" to help make it more clear that the last item is a separate list.

I helped my company discover new tools that improved youtheir development time for basic features, such a login authentication, admin management forms and the implemetation of continuous delivery for the environment deployment. I helped my company discover new tools that improved their development time for basic features, such a login authentication, admin management forms and the implemetation of continuous delivery for the environment deployment.

I wouldn't use "your" here as you are not speaking generally/hypothetically, but very concretely about what this company did

I helped my company discover new tools that improved your development time for basic features, such a login authentication, admin management forms, and the implementation of continuous delivery for the environment deployment. I helped my company discover new tools that improved development time for basic features, such login authentication, admin management forms, and the implementation of continuous delivery for the environment deployment.

"your" isn't correct here because it implies benefits for the reader, but in this context you're talking about the company, not the reader. In this case we can just drop the word entirely. I assume you're talking about CI/CD for the last bullet point? You could probably include it in parentheses, but in general, if this is an introduction paragraph or a cover letter to apply to a new job position the correct answer is to just copy and paste the buzzwords from the job listing directly and use exactly the same terminology word-for-word so that the automated resume filter doesn't filter yours out.

For some time, I was assigned to support a specific client inOne of my core responsibilities was that I worked as a support liaison for an important client, where I identifinged and resolvinged productions issues. One of my core responsibilities was that I worked as a support liaison for an important client, where I identified and resolved production issues.

Production in this context does not need to be made plural. "for some time" might be a little too ambiguous, so I replaced it with something that removes ambiguity. This is an optional change, though. Replaced the more passive verbs "was assigned" with a more active verb "worked." This another optional change mainly from the perspective of resume / cover letter writing. "a specific client" can also be replaced with stronger language to better highlight your expertise.

Frequently, I participated in calls with the client's team to define new demandrequests, present and explainnewly deployed features, and document possible bugissues. Frequently, I participated in calls with the client's team to define new requests, present newly deployed features, and document possible issues.

Demand is used correctly in this context, so this is another optional change. But, demand may have negative connotations, as in you are implying your client is demanding. That's why I replaced it with requests. This is another piece of advice from the perspective of resume / cover letter writing. I replaced bugs with issues for a similar reason, bugs is a more informal / slang term, where "issues" or "tickets" are better terms for more formal business writing. This is also another instance of a list within a list, which can be a bit confusing. Usually the only instance where a list within a list can work is if the second list is the last item, not one of the middle items. Even so, it's better in general to find a way to express it without relying on lists inside lists as much as possible.

After years of experience, I took on new responsibilities, such as helping and mentoring co-workers that struggled with project or cloud-releated problems, creating and managing cloud infraestructure and generating reports about applications performance, including leads convertsion, orders completion and revenue. After years of experience, I took on new responsibilities, such as helping and mentoring co-workers that struggled with project or cloud-releated problems, creating and managing cloud infrastructure and generating reports about applications performance, including leads conversion, order completion and revenue.

Minor spelling errors Here I wouldn't pluralise "order", because you are speaking very generally. "I worked on order completion" vs "I completed the orders".

After years of experience, I took on new responsibilities, such as helping andfacilitated my colleagues and the business in several ways. I mentoringed co-workers that struggled with project or cloud-releated problemtickets, I creatinged and managinged cloud infraestructure, and I generatinged reports about applications performance, including leads convertsion, orders completion, and revenue. After years of experience, I facilitated my colleagues and the business in several ways. I mentored co-workers with project or cloud-related tickets, I created and managed cloud infrastructure, and I generated reports about application performance, including leads conversion, orders completion, and revenue.

Another instance of multiple lists within lists. This one has too many lists within lists to be read comfortably by a human, so I rewrote each as a separate sentence connected by "and." This removes the ambiguity. Removing "that struggled" and "problems" as another pair of optional changes. From a resume / cover letter perspective, you don't want to use potentially negative terms as a prospective employer may misconstrue it.

I also collaborated in studying and identifying scenarios where we could use IAI to improve your development flow. I also collaborated in studying and identifying scenarios where we could use AI to improve development flow.

A.I. = artificial intelligence I would make it even more general here and remove the "your"

I also collaborated in studyresearching and identifying scenarios where we could use IA to improve your development flow. I also collaborated in researching and identifying scenarios where we could use IA to improve development flow.

Another optional change: researching is a stronger verb in this context than studying. "Studying" in this context implies you are a student, "research" in this context implies you are an expert.