"I knew from a young age that I wasn't the same as the other children," says Sophie Roberts, a 34-year-old Amazon software manager based in Edinburgh.
"I realised at around 14 or 15 that I was transgender but I wasn't comfortable at that point in my life in being out about it."
It was 20 years later that she took the decision to come out at work. Last month, after two years at Amazon, she started coming into the office as Sophie.
She admits she was nervous that her transition would affect her professionally - the tech sector isn't exactly renowned for its diverse workforce.
But her experience at Amazon may have lessons for other companies big and small.
"I did go into it thinking to myself, 'Is this going to be a problem?'" she told the BBC.
However, for Sophie, the experience so far has been overwhelmingly positive.
"I'm running the same team, we're building the same products for our customers and we're having the same impact."
After beginning discussions with her site leader and the local human resources team in January 2017, Sophie made her initial announcement by email to 1,000 colleagues in May this year.
She says her colleagues were "surprised, supportive, excited" - and one particular response has stayed with her.
"One of the women who used to work for me, her first email that she sent me was, 'Congratulations Sophie, I'd like to invite you to join the Amazon Women in Engineering Group.'
"That just happened, and for that to be someone who used to work for me and for that to be her first response - I knew that I belonged there."
But Sophie credits the company with being a supportive employer.
"Organisations want to help with this," she says.
"They want it to go well. It's better for the organisation to have a more diverse workforce, and it's better for you to be able to live an authentic life."
The tech giant already had a toolkit in place, designed to answer common questions that staff may have - including an explanation of its bathroom policy (staff can use whichever gender bathroom they identify with) - to take the burden off people like Sophie having to explain the same things over and over again.
Sophie worked with Amazon in the US, and the firm's LGBT group Glamazon, to adapt the toolkit for the UK.
Glamazon also successfully suggested a change to the internal staff directory, and as a result all individuals can now display the pronoun to which they would like to be referred.
"That was probably the first major thing that I think brought the conversation really into people's minds," she says.
"Pronouns are something which people don't spend a lot of time thinking about but they are incredibly affirming."
'Banter and jokes'
While Sophie had a good experience within a large organisation, this is not always the case, says Dr Jane Hamlin, president of the Beaumont Society, a UK-based support group for transgender people.
"The problems that we hear about tend to be with middle management and work colleagues," she says.
"Banter and jokes that are not funny for the trans person involved.
"Another time when difficulties can occur for trans people is if they have a public-facing job, receptionists, sales staff etc. Some employers move trans people to back office jobs."
There can also be issues when changing jobs, Dr Hamlin says, citing an example of a trans woman currently seeking advice because she has applied for a new job and has been asked to supply a birth certificate.
"A trans person can only get a new birth certificate if they have a gender recognition certificate," she says.
"At the moment this is an intrusive, bureaucratic, slow and expensive process which few trans people have embarked upon for that reason."
'Don't be scared to ask questions'
For Sophie, after many months of physical changes, and a name change, her return from a holiday in October seemed like the natural time to come to work as Sophie for the first time.
"I announced in May and I only started presenting as Sophie in October and then we had a lot more conversations which I think was the point where it became a lot more real for people," she says.
"In terms of my colleagues talking to me, I asked them to talk to me as they would talk to any other colleague.
"Don't be scared of asking me a question because I am transgender, but also don't wade into questions that you wouldn't ask any other colleague.
"So, for example, by all means ask me how my weekend was but don't necessarily ask me what surgery I've had. I think that's a nice balance."