This volume constitutes the thoroughly refereed post-conference proceedings of the 11th International Conference on Verified Software: Theories, Tools, and Experiments, VSTTE 2019, held in New York City, NY, USA, in July 2019. The 9 full papers presented were carefully revised and selected from 17 submissions. The papers describe large-scale verification efforts that involve collaboration, theory unification, tool integration, and formalized domain knowledge as well as novel experiments and case studies evaluating verification techniques and technologies.

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Uncertainty, Modeling and Safety Assurance: Towards a Unified Framework.- Combinations of Reusable Abstract Domains for a Multilingual Static Analyzer.- Verifying Network Control Planes.- Verifiable Homomorphic Tallying for the Schulze Vote Counting Scheme.- Incremental Minimization of Symbolic Automata.- Seamless Interactive Program Verification.- Formal Verification of Work Flow Policies for Smart Contracts in Azure Blockchain.- Ghost Code in Action: Automated Verification of a Symbolic Interpreter.- DCSynth: Guided Reactive Synthesis with Soft Requirements.- Refinement type contracts for verification of scientific investigative software.- solc-verify: A Modular Verifier for Solidity Smart Contracts.- Intersection and Rotation of Assumption Literals Boosts Bug-Finding.