Remove whitespace before enumerate

Question

I am using a list like this:

\section{My section}
\begin{enumerate}
\item My first item
\item Second item
\end{enumerate}

The problem is that enumerate produces a vertical whitespace just before the first item.

So if I use

\section{My section}
Some text
\begin{enumerate}
\item My first item
\item Second item
\end{enumerate}

instead of just

\section{My section}
\begin{enumerate}
\item My first item
\item Second item
\end{enumerate}

the first item, "My first item", will have exact same location.

So the list environment seems to reserve a spot for text above it. I have tried using:

\usepackage{enumitem}
\setenumerate{partopsep=0cm, topsep=0cm}

but it doesn't change anything.

I guess I could use \vspace{-some value} just before my lists, but I need a more generic code, so I have to set the option globally.

Edit

This code:

\documentclass{article}

\usepackage{titlesec}
\usepackage{enumitem}

\titleformat{\section}[leftmargin]{\raggedright}{}{0pt}{}[]
\titlespacing*{\section}{2.5cm}{2.5ex}{0cm}

\setlist[enumerate]{topsep=0cm, leftmargin=0cm, label={}}

\begin{document}

\section{Experience}
Some text
\begin{enumerate}
\item Software Developer
\item Project Manager
\end{enumerate}

\section{Education}
\begin{enumerate}
\item M.Sc.
\item B.Sc.
\end{enumerate}

\end{document}

produces this:

As seen next to "Education", the problem is that the list 'reserves' some space for a paragraph just above it.

Answer 1

Better use a table for the job. For example:

\documentclass{article}
\usepackage{setspace}

\begin{document}

% \renewcommand{\arraystretch}{1.15}%height of table rows
\onehalfspacing%linespacing

\begin{tabular}{l p{\dimexpr\linewidth-2.5cm}}
Experience & Software Developer\newline Project Manager\\[5mm]
Education & M.Sc.\newline B.Sc.\\
\end{tabular}

\end{document}