Viktor Olsson
Senior Software Engineer
Stockholm,Sweden
Summary
Aspiring Smart Contract Auditor with a passion for blockchain technology and a strong drive to excel in the field. Currently engaged in part-time auditing on platforms like Code4rena and Sherlock, actively seeking a transition to a full-time role in smart contract auditing. Demonstrating continuous growth in experience, maturity, and expertise as an auditor, with a keen determination to take skills to the next level.
Overview
14
14
years of professional experience
6
6
years of post-secondary education
Work History
Senior Software Engineer/Tech lead
Worldline
Stockholm , Sweden
2013.01 - Current
- Developed high-performance distributed reconciliation system in Java, using Cassandra. Seamlessly handling millions of daily transactions, leading to 300% improvement in backoffice operations' efficiency and accuracy.
- Created HTTP load balancing library for 1000+ requests/s, facilitating seamless REST communication among 150 microservices in cloud and on-premises environments.
- Strengthened platform security with best practices, prompt vulnerability resolution, and PCI-DSS compliance in payments environment.
- Mentored and guided 3 junior software engineers, empowering them to grow into experienced and independent developers.
- Designed and introduced Prometheus + Grafana suite, monitoring over 1000 instances in production.
- Improved team collaboration by leading the development chapter fostering knowledge sharing.
- Enhanced team efficiency by providing leadership and support to geographically dispersed teams in locations such as Brazil and India, nurturing cohesive and productive global collaboration.
- Leading platform migration to cloud, designing core libraries and pipelines for seamless on-premises infrastructure interoperability using jib, Kubernetes, and Terraform tools.
- Extensive experience in handling production incidents, alleviating customer impact, and conducting Root Cause Analyses (RCAs) to identify underlying issues and communicate transparent mitigation strategies.
DBA/Application technician
Digital River World Payments
Stockholm , Sweden
2010.01 - 2013.01
- Provided 2nd and 3rd line technical support, specializing in account reconciliation and settlement report reconciliation for Brazil connections.
- Managed Linux and SQL databases to ensure smooth operations and effective issue resolution.
- Coordinated with project management staff on database development timelines and project scope.
- Designed and developed analytical data structures.
- Planned and implemented security measures to safeguard vital business data.
- Created and implemented database designs and data models.
Education
Masters - Engineering physics
Royal Institute of Technology
Stochholm 2004.09 - 2010.05
Theoretical Philosophy
Stockholm University
Stockholm 2009.01 - 2009.05
Skills
Personal: fast learner, great problem solver, self critical, creative, talented presenter, cheerful personality
Technical: Git, Gradle, Jenkins, Kubernetes, GCP, GCP Pub/Sub, Terraform, DB2, Apache Cassandra, Solr, Prometheus, Grafana
Programming languages: Java, Solidity, SQL, Bash
Languages
English
Fluent
Swedish
Native
Timeline
Senior Software Engineer/Tech lead
Worldline
2013.01 - Current
DBA/Application technician
Digital River World Payments
2010.01 - 2013.01
Theoretical Philosophy
Stockholm University
2009.01 - 2009.05
Masters - Engineering physics
Royal Institute of Technology
2004.09 - 2010.05
Accomplishments
- Secured victories in two prestigious contests:
- Inverse (October 2022)
- Teller (April 2023)
- Won three internal hackathons by developing and showcasing innovative and fun projects:
- A coffee level monitor for the coffee brewer
- Play the transaction log as music
- Migrate the API gateway application to use our internal http loadbalancing library
Interests
Playing music, skiing, cooking, traveling
Similar Profiles
Monica Di CarloMonica Di Carlo
Delivery Customer Support at WorldlineDelivery Customer Support at Worldline
Joshua EkeanyanwuJoshua Ekeanyanwu
Customer Operations Tech Specialist at WorldlineCustomer Operations Tech Specialist at Worldline
Daniela AlbuDaniela Albu
Test Engineer, Contractor at WorldlineTest Engineer, Contractor at Worldline