Ruslan Ahmadzai

Principal

Ruslan (Ross) is an Immigration Solicitor and Registered Migration Agent specialising in corporate, individual and business migration in addition to general global mobility matters, including audit and compliance associated with sponsoring foreign nationals.

Having worked in several law firms including Fragomen, and the big Four (KPMG), Ross has a wealth of experience in all areas associated with Australian immigration law, with over 10 years of relevant industry experience.
Being a migrant from Tajikistan, Ross has developed a strong passion for immigration matters and understands the importance of deciding to call Australia home. He ensures that all his clients receive the personalised service, care, and attention they deserve. Ross’ mission is to ensure that his clients fully understand their immigration journey and achieve their desired immigration outcome.

Ross’ key areas of expertise

● Corporate immigration, including but not limited to temporary and permanent sponsored migration

● Business Migration pathways for entrepreneurs and business owners

● Audit and compliance as well as strategic workforce planning including designing and developing systems and processes for HR and Global Mobility Managers to assist them with managing foreign employees

● Advisory services including employment law matters relevant to foreign nationals residing in Australia

● Individual migration including skilled independent, state sponsored and family migration

● Representing clients at the Administrative Appeals Tribunal

● Advising on sponsorship and visa cancellations

Zana Serdar

Senior Immigration Lawyer & Solicitor,

Immigration Practice Leader

Zana Serdar is a Migration Lawyer with a focus on corporate immigration. Her expertise is in employer-sponsored visas, labour agreements, DAMAs, training visas and complex visa matters.

Zana earned her law degree from Macquarie University in 2018. While she initially strated her legal career in criminla law, Zana soon discovered her passion for migration law and hasn’t turned back since.

Driven by a genuine passion for migration law, Zana is dedicated to navigating the complexities of this field.

In her spare time, Zana enjoys obsessing over skincare and interior design.

Qualifications: Bachelor of Laws and a Bachelor of Arts (Majoring in Criminology), Macquarie University

Mayumi Martins

Senior Immigration Lawyer

Mayumi is a dual qualified lawyer in Brazil and Australia.

Prior to joining Crystal Migration, Mayumi obtained a Master of International Commercial Law from the University of Queensland, a Juris Doctor with Distinction from UNSW, and a Bachelor of Laws from the University of São Paulo, Brazil. She has also worked in an Australian top-tier law firm as well as in-house and at various government agencies in Brazil, including the Federal Public Prosecutor’s Office.

Being an immigrant herself, Mayumi has successfully navigated four different visa pathways until finally obtaining her PR. Her personal experience has fuelled her passion for migration law. She is now committed to leveraging her legal skills to assist clients through creative migration solutions, empowering individuals to pursue better opportunities in Australia and businesses to capitalise on global talent.

Mayumi is a native Portuguese speaker, fluent in English and Spanish, and proficient in intermediate French.

 In her free time, Mayumi is passionate about dancing (bachata and salsa), yoga (anywhere – be it a serene studio or in the middle of an airport line), reading (especially when basking in the sun) and cooking (she claims that the kitchen is her ‘creative lab’). She also has an uncanny ability to turn casual conversations about nutrition and health into TED Talk-worthy monologues— whether you ask for it or not!

Juan Silva

Registered Migration Agent,

Compliance Coordinator

 I came to Australia with the purpose of finishing an English course and then return home. Little did I know that Australia was going to become my second home. I studied Law in my home country, Venezuela, where I lived my whole life.  

I have had the chance to travel around the world and live in a couple of places. After meeting my partner in Australia, I had the amazing opportunity to become a permanent resident of this beautiful country. It was during this process that I discovered my passion for visas and helping others achieve their migration goals in Australia. 

I am soon to complete my studies in Migration Law and Practice.  

Crystal Migration has been a great place to start my career in Immigration. The team is highly skilled and experienced, and I have learnt greatly from all of them. I am eager to continue growing my skills and contribute to making the dreams of many a reality, to call Australia home.  

I am passionate about traveling, exploring new places and experiencing new cultures. I love the beach and a nice warm, sunny day. 

Sophia Gleissberg

General Operations Manager

Having lived in Dresden, Germany for the majority of her life, Sophia first came to Australia as a backpacker in 2008. After spending two years in the country, she returned to Sydney in 2014 to study Event Management. She worked on various small to large-scale events until COVID-19 prompted a career shift while living in Melbourne.

During the lockdown, Sophia taught herself Graphic and Web Design, and her passion has only grown since.

Sophia has been part of Crystal since its inception in 2019 and is now a key member of the team as the General Operations Manager, a role she officially stepped into in January 2025.

Matheus Lima

Contracts Supervisor

Born in Brazil, Matheus started his career as a Brazilian lawyer in 2018, working on corporate, contracts and tax law areas. When dealing with multinational companies as clients, he felt the necessity of improving his language skills, so he moved to Ireland and stayed for 5 years, where he completed his English course and a masters degree in dispute resolution.

In Ireland, he had a brief contact with migration, but it was enough to spark his interest in the area and seek more knowledge and opportunities. 

Looking for a warmer country to live in, he moved to Australia in 2023, initially living in Western Australia and then moving to Sydney, where the opportunity to work at Crystal Migration was presented to him. 

In his spare time, Matheus enjoys sports, especially football (soccer), and traveling.

Mariam Alawie

Immigration Consultant

I have always had a passion for exploring different nationalities, cultures, and languages. I completed a Bachelor of Business and Bachelor of Law, while searching for the field I enjoyed.  I was fortunate enough to work in the Migration Industry 6 years ago and this stimulated my passion for the industry and my desire to work in the field. 

Working with Crystal Migration has given me an opportunity to work in a diverse industry I am passionate about. Our work is extremely rewarding as we have a life-changing impact on clients. We are always working hard to ensure clients receive a personalised service as we help each client embark on a new journey to call Australia home.

During my spare time, I love spending time with my family, exploring nature and cooking!

Chhounkim (Kim) Chea

Legal Secretary

Born and raised in Cambodia, he spent most of his life living there until finishing High School. Afterward, he moved to Sydney in 2018 to pursue further studies.

He has received his bachelor’s degree in IT.

As a new addition to the Crystal Migration Training team, Kim performs admin tasks as well as providing assistance to the clients.

Rahul Singh

Admin Assistant

Rahul was born in Sydney, Australia and has spent his entire life living there.

He has received his bachelor’s degree in Commerce and Computing. After working in consumer electronics retail for the past 5 years, he has migrated his skills and experience to a new role in a new industry.

As a new addition to the Crystal Migration Legal team, Rahul performs admin tasks as well as providing assistance to the clients.