KTH Royal Institute of Technology in Stockholm, Sweden, invites applications for two PhD positions focused on the theoretical foundations of data storage and analysis. The research group specializes in developing practical computer science algorithms with provable guarantees, leveraging theoretical insights to achieve state-of-the-art practical solutions. Current research interests include randomized algorithms, probabilistic data structures such as data sketches, Bloom filters, and hash functions, as well as the implementation and development of efficient data structures for subroutines in computer science algorithms.

The positions are mathematically intensive, with doctoral students expected to devote significant effort to the theoretical analysis of algorithms. Multiple research directions are possible and will be determined in collaboration with the selected candidates. The successful applicants will be supervised by Professor Aristides Gionis and Assistant Professor Ioana-Oriana Bercea, both recognized for their expertise in algorithms and data analysis.

As a PhD student at KTH, you will join a dynamic, international research environment with opportunities for collaboration with industry and leading universities worldwide. The positions are fully funded, offering a monthly salary according to KTH's doctoral student agreement, along with comprehensive employment benefits and social security as per Swedish regulations. The employment is full-time for up to four years, with the possibility of limited teaching or administrative duties (up to 20%).

Eligibility and Requirements: Applicants must hold, or be close to completing, a master's degree (or equivalent) in computer science, mathematics, electrical engineering, or technical physics with a theoretical focus. A minimum of 240 ECTS credits, including at least 60 at the advanced level, is required. Candidates must demonstrate a strong background and passionate interest in algorithm design and mathematics, particularly in probability and optimization, and present an outstanding academic record. Proficiency in English (spoken and written) equivalent to English B/6 is mandatory. Participation in International Mathematical or Informatics Olympiads is considered a merit. Personal qualities such as independence, collaboration skills, professionalism, and the ability to analyze and address complex issues are highly valued.

Application Process: Applications must be submitted via the KTH recruitment system. Required documents include a CV, cover letter (max 2 pages), degree certificates, transcripts, proof of English proficiency, and representative publications or technical reports. All documents not in English or Swedish must be translated and certified. The application deadline is November 27, 2025.

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