pBitrock is a high-end consulting and system integration company, strongly committed to offering cutting-edge and innovative solutions. Our tailored consulting services enable our clients to preserve the value of legacy investments while migrating to more efficient systems and infrastructure. We take a holistic approach to technology: we consider each system in its totality, as a set of interconnected elements that work together to meet business needs. We thrive on overcoming challenges to help our clients reach their goals, by supporting them in the following areas: Data, AI ML Engineering; Back-end Engineering, Platform Engineering, Front-end Engineering, Product Design UX Engineering, Mobile App Development, Quality Assurance, FinOps, Governance. The effectiveness of our solutions also stems from partnerships with key technology vendors, like HashiCorp, Confluent, Lightbend, Databricks, and Meterian. /ph3Who we are looking for /h3pWe are looking for a bSenior Data Architect Freelance /bto lead the evolutionary migration of a production Apache Cassandra 3.11 cluster (approx. 29 TiB of unique data) to Cassandra 5.0, using a parallel-cluster architecture with zero downtime. /ph3The role /h3pYou will be the technical reference for the project and the design authority on everything related to data. You will work closely with the client, a team of DevOps engineers and backend developers, and the project manager, from the initial assessment through cutover and the subsequent support phase. /ph3Responsibilities /h3ulliLead the assessment of the existing cluster: analysis of SSTables, partitions, tombstones and workload, performance baseline, mapping of read and write flows. /liliDesign the target data model (DDL, bucket granularity, compaction strategies such as TWCS and UCS, TTL and differentiated retention), backing your choices with measured data. /liliDefine the capacity model and hardware sizing of the new cluster, including a rack-aware topology across three failure domains.



/liliProvide technical direction for the historical data migration: transformation specification, preservation of writetime and TTL, multi-level validation plan. /liliSupport the backend team in adapting application queries to the new data model. /liliDefine and verify acceptance criteria: p95 latencies, data integrity, rollback procedures. /liliWrite and present design documents, migration plans and technical reports to the client. /liliDuring the maintenance phase, act as third-level escalation on Cassandra and data architecture, estimating and validating Change Requests. /li /ulh3Requirements /h3ulliProven experience in technical roles on projects using bApache Cassandra /b in production. /liliIn-depth knowledge of Cassandra data modelling, particularly for time series and IoT data. /liliHands-on experience with Cassandra operations: compaction, repair (Cassandra Reaper or equivalent), backup and restore, JVM and storage tuning, troubleshooting of latencies and hot partitions. /liliExperience with at least one major Cassandra migration or upgrade, preferably involving schema changes. /liliGood knowledge of bLinux /band bare-metal infrastructure. /liliExperience in technically leading a team and presenting architectural decisions to both technical and business stakeholders. /liliExcellent command ofb Italian, /b written and spoken: the role involves daily interaction with the client and writing technical documentation in Italian. /li /ulh3Nice to have /h3ulliExperience with Cassandra 4.x/5.0 (SAI, BTI, UCS) or ScyllaDB. /liliApache Spark and Spark Cassandra Connector for large-scale data movement. /liliMessaging systems: NATS/JetStream, Kafka or similar. /liliKnowledge of Cassandra drivers in Node.js or Java. /li /ulh3Work mode: /h3pFull remote | bStart: /b ASAP | bDuration: /b1 year /ph3Recruitment Process /h3pOur selection process is streamlined into 2 stages: /pullibDiscovery Call: /b Short initial interview with our HR team. /lilibTechnical Fit Interview: /b In-depth discussion with our Delivery Team Leaders / Management. /li /ul #J-18808-Ljbffr

📌 Senior Data Architect Freelance (Italia)
🏢 Bitrock
📍 Italia