WHO WE ARE
Crystal Migration Legal Services is a Sydney-based firm specialising in strategic immigration advice and legal support.
We assist businesses of all sizes, current visa holders, and prospective applicants in navigating the Australian immigration system—whether you’re planning a move, managing global mobility, or seeking a permanent pathway.
With experience drawn from large firms and a commitment to personalised service, we offer clear, practical guidance tailored to your goals.
Our core services include:
Corporate immigration consultancy and strategic advisor
Pathway planning for Permanent Residency and Citizenship
Visa application assistance (temporary, permanent, work, citizenship)
Compliance, audit preparation, and employer monitoring
Legal representation in complex immigration and review matters
Tailored immigration support for HR teams, legal counsel, and business owners
Our Mission
Our mission is to provide clear, strategic immigration support through personalised service and lasting partnerships.
We work with businesses, legal teams, and private clients to navigate corporate immigration, advisory matters, and complex reviews or appeals. Our commitment is to deliver not just outcomes, but a consistent, collaborative experience—built on trust, expertise, and timely execution.
Our Vision
To be recognised as one of the leading Australian Immigration advisors with a progressive point of view on Australian immigration. We take away the bureaucracy and treat our clients as people.
Looking for personalised support or strategic immigration advice?
Let’s make your next move simple.
Explore Our Services
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What We Stand For
We work in a space where lives change — and that responsibility shapes everything we do.
These three values are at the heart of how we operate, lead, and connect:
Trust
Trust is the foundation of everything we do. We earn it through transparency, reliability, and consistently delivering on our word.
Our clients trust us with their futures — and we honour that with honest advice, legal rigour, and unwavering accountability.
Respect
We treat every client, colleague, and stakeholder with genuine respect — regardless of background, status, or circumstance.
Whether we’re working with individuals navigating life-changing decisions or global companies managing compliance, we listen with care and respond with professionalism.
Diversity
As a proudly multicultural team, we understand firsthand the value of diverse experiences and perspectives.
We embrace difference — not just in background, but in thinking — and create space for our clients and team members to be seen, heard, and supported.
Your CML Team
Ross Ahmadzai
Zana Serdar
Sophia Gleissberg
Mayumi Martins
Juan Silva
Matheus Lima
Mariam Alawie
Chhounkim (Kim) Chea
Rahul Singh
Ruslan Ahmadzai
Principal
Ross is the Principal Solicitor at Crystal Migration and brings over 16 years of experience in Australian immigration law. He advises across corporate, individual, and business migration pathways, and is highly regarded for his work in audit, compliance, and global mobility strategy.
Before founding Crystal, Ross held senior roles at Fragomen and KPMG, where he developed end-to-end migration solutions for ASX-listed companies, Fortune 500 clients, and global HR teams. His ability to align immigration advice with business goals has positioned him as a trusted advisor in both legal and commercial contexts.
Having migrated to Australia from Tajikistan, Ross brings a personal understanding to the immigration process. He is known for his strategic approach and empathetic client care, ensuring each matter is handled with clarity and confidence.
Ross holds degrees in Law and Media & Communications from the University of Technology Sydney and is admitted to practice in the High Court of Australia. He speaks English and Russian.
Key areas of expertise include:
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Corporate and employer-sponsored migration
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Business and investor visas
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Audit, compliance, and strategic planning for HR and mobility teams
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Employment law advice for foreign nationals
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Skilled, state-sponsored, and family migration
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Appeals and review matters before the ART
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Sponsorship and visa cancellation matters
Zana Serdar
Senior Immigration Lawyer & Solicitor,
Immigration Practice Leader
Zana is a senior lawyer at Crystal Migration, leading the immigration legal team with a focus on corporate and employer-sponsored migration. She specialises in temporary and permanent sponsorships, training visas, labour agreements, DAMAs, and complex visa strategies.
Zana holds a Bachelor of Laws and a Bachelor of Arts in Criminology from Macquarie University. She began her legal career in criminal law before finding her passion in migration—an area she has remained committed to ever since.
Known for her practical, solution-focused approach, Zana guides clients through the complexities of migration law with clarity, care, and precision.
Outside of work, she enjoys curating beautiful interiors and indulging in skincare rituals.
Mayumi Martins
Senior Immigration Lawyer
Mayumi is a dual-qualified lawyer in Brazil and Australia, with a strong international background across private practice, in-house legal teams, and government agencies. She holds 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.
Her career spans experience at a top-tier Australian firm, in-house legal work, and roles within the Brazilian Federal Public Prosecutor’s Office.
As a migrant herself, Mayumi has navigated four different visa pathways before achieving permanent residency—an experience that informs her deeply empathetic and creative approach to migration law.
She speaks Portuguese, English, and Spanish fluently, and has intermediate proficiency in French.
Outside of work, Mayumi is passionate about dancing (especially bachata and salsa), yoga (anywhere—studios, airports, you name it), reading, and cooking. She has a knack for turning everyday chats into insightful health and wellness monologues.
Juan Silva
Registered Migration Agent,
Compliance Coordinator
Juan began his migration journey as an international student from Venezuela, arriving in Australia to study English—never imagining it would become home.
With a legal background from Venezuela and firsthand experience navigating the Australian visa system, Juan developed a strong interest in migration law. He is currently completing the Graduate Diploma in Migration Law and Practice while working as a Registered Migration Agent and Compliance Coordinator at Crystal.
Juan is passionate about guiding others through their migration journeys, helping them understand their options and achieve meaningful outcomes.
In his spare time, he enjoys travel, learning about different cultures, and sunny days at the beach.
Sophia Gleissberg
General Operations Manager
Sophia oversees the daily operations and strategic direction of both the legal and training divisions at Crystal Migration. Originally from Dresden, Germany, she moved to Australia in 2014 after an early career in events, later transitioning into operations and digital systems during the Melbourne lockdowns.
Sophia joined Crystal in its founding year and has been instrumental in developing its internal systems, streamlining processes, and building a people-first operational framework across the business.
With a passion for clarity, efficiency, and team experience, Sophia blends creative problem-solving with strategic insight to support clients and staff alike.
Matheus Lima
Legal Secretary
Matheus is originally from Brazil and began his legal career in 2018, specialising in corporate, contract, and tax law. His work with multinational clients took him to Ireland, where he earned a Master’s in Dispute Resolution and improved his English skills.
It was during this time abroad that he discovered his interest in migration law, which eventually led him to Australia in 2023.
Now part of the Crystal team in Sydney, Matheus brings global perspective, strong administrative skills, and a genuine passion for supporting clients in navigating complex legal systems.
He enjoys travelling and playing football (soccer) in his downtime.
Mariam Alawie
Immigration Consultant
Mariam holds qualifications in both Business and Law and has worked in migration for over six years. Her interest in people, cultures, and the power of a new beginning led her to a career in immigration, where she continues to find deep purpose and connection.
At Crystal, Mariam delivers personalised, empathetic support to clients, helping them navigate legal processes with clarity and confidence.
Outside of work, she enjoys spending time with her family, being in nature, and cooking.
Chhounkim (Kim) Chea
Legal Secretary
Born and raised in Cambodia, Kim relocated to Sydney in 2018 to pursue further education and has since completed a Bachelor’s degree in Information Technology.
He supports the Crystal Migration Training team with administrative coordination, enrolments, and client support, helping ensure the training arm runs smoothly and efficiently.
Kim is passionate about personal growth, helping others, and developing his career within the business and education space.
Rahul Singh
Admin Assistant
Rahul was born and raised in Sydney and holds a Bachelor’s degree in Commerce and Computing. With a background in retail and electronics, he brings strong customer service and technical know-how to his role at Crystal.
As part of the administration team, Rahul supports both clients and colleagues across a wide range of tasks and is excited to grow his career within the legal sector.