Lisa Casner

CTO

San Francisco, California, United States16 yrs 5 mos experience
Highly Stable

Key Highlights

  • Expert in backend development and microservices architecture.
  • Proven track record of mentoring engineers and driving team growth.
  • Recognized for optimizing operational workflows and reducing workloads.
Stackforce AI infers this person is a Backend Engineer with expertise in SaaS and operational efficiency.

Contact

Skills

Core Skills

Backend DevelopmentMicroservices Architecture

Other Skills

PostgreSQLRuby on RailsGo (Programming Language)Python (Programming Language)SQLEngineeringInsuranceData AnalysisActuarial ScienceHealth InsuranceFinancial AnalysisRisk ManagementResearchAnalytical SkillsAnalysis

About

Staff Backend Engineer passionate about solving complex problems and driving impactful, customer-centric solutions.

Experience

Friday harbor

2 roles

Head of Engineering

Promoted

Jul 2025Present · 8 mos · Remote

Founding Engineer

Apr 2025Jul 2025 · 3 mos · Remote

Opendoor

5 roles

Staff Software Engineer

Sep 2024Mar 2025 · 6 mos

  • Define and lead the execution of short- and long-term roadmaps for the Marketplace Platform team, driving scalable expansion of Exclusives across markets by migrating critical functionality from a RoR monolith to scalable Go microservices architected with Domain-Driven Design.
  • Initiated collaboration with operators to identify scaling needs, leading to the design and implementation of a touring platform that reduced operator team workload by 15+ hours per week, decomposed key functionality from the monolith, and enhanced product functionality and data-driven decision-making.
  • Led the implementation of a resale platform powering critical system flows, integrating Exclusives with non-exclusive (MLS) inventory, reducing three galleries to one, and paving the way for long-term monolith deprecation.
  • Recognized as a subject matter expert across multiple system areas, frequently assisting other teams during outages and other root cause investigations.
  • Established best practices to minimize on-call burden, enhance alerting and observability, improve test coverage, and elevate code quality.
  • Proactively identify and resolve critical bugs across the organization, reducing the impact of high-priority issues.
  • Mentor engineers at various levels, fostering growth, skill development, and technical excellence.
PostgreSQLRuby on RailsGo (Programming Language)Backend DevelopmentMicroservices Architecture

Senior Software Engineer

Promoted

Aug 2021Sep 2024 · 3 yrs 1 mo

  • Proactively identified and resolved critical issues beyond her team’s scope. For example, led efforts to optimize seller offer creation speed, a critical business function, reducing overall SLA breaches by 90%+ and cutting p95 latency by 30%.
  • Designed and led the launch of the 3rd-party Marketplace Exclusives (3P) product, a critical initiative for business growth and market expansion. Delivered the initial MVP under tight deadlines and, over the following months, launched key features—including touring, communications, and more—to enhance and expand the 3P product.
  • Designed and led the implementation of the buyer checkout flow for Exclusives, enabling buyers to seamlessly purchase an Exclusive home with just a few clicks on a first-come, first-served basis, significantly streamlining the home purchase process and enhancing user experience.
  • Redesigned and rebuilt the initial MVP of the Exclusives product to align with RoR principles and best practices. Drove the development of key foundational workflows and architecture, shaping the core of the 0-1 product.
  • Contributed to the product roadmap by pitching ideas and driving execution, including writing and developing one of the most effective marketing campaigns for Exclusives, which significantly boosted engagement and adoption.
  • Proactively identified and implemented backend solutions for the Exclusives operator workflows, reducing operator team workload by 40+ hours per week and optimizing key operational workflows without direct assignment.

Software Engineer II

Promoted

Feb 2020Aug 2021 · 1 yr 6 mos

  • Identified a major architectural flaw that hindered the ability to reliably serve customer offers and caused frequent outages. Drafted a comprehensive design proposal to address the issue and led the team through the implementation of multiple project phases. The new design eliminated recurring outages, improved system stability, enhanced observability, and remains a critical component of the platform today.
  • Proactively proposed and led initiatives to reduce a heavy on-call burden by refactoring the List With Opendoor service to support various workflows and eliminate recurring issues. These improvements reduced bug tickets from 40+ per week to near zero.
  • Helped launch and lead the first apprenticeship program, mentoring a successful cohort of high-performing full-time engineers who have made significant contributions across the organization.

Software Engineer

May 2018Feb 2020 · 1 yr 9 mos

  • * Won multiple company-wide awards for going above and beyond to “act from ownership”.

Software Engineering Intern

Feb 2018May 2018 · 3 mos

  • * Converted to full-time employee following a successful, performance-based internship.

Hackbright academy

Fellow

Oct 2017Dec 2017 · 2 mos

  • Accelerated, 12-week, software engineering program for women. Tech stack includes: Python, JavaScript (AJAX, JSON), HTML, CSS, SQL, Flask, jQuery, Bootstrap, Jinja, PostgreSQL, Git, GitHub, Command Line.

Funding circle us

Senior Analyst, Payment Operations

Mar 2017Oct 2017 · 7 mos · San Francisco Bay Area

  • Created templates to automate daily/weekly taskwork using a combination of VBA and complex Excel formulas, saving a significant amount of time while improving accuracy.
  • Researched, selected, and executed task management process for recurring/adhoc task and project work.
  • Provide daily operational support for contributions and distributions of funds to and from borrowers and investors via ACH, wires and checks.
  • Identify, review and resolve exceptions as they arise.
  • Perform daily reconciliations between systems and cash transactions.
  • Help to streamline treasury processes and procedures and enforce cash controls.
  • Use SQL to gather data for metrics and other requests.
  • Mentor team on Excel and SQL-related questions.

Zenefits

4 roles

Senior Product Specialist

Promoted

Nov 2016Feb 2017 · 3 mos

  • Triaged and investigated codebase for root cause of bugs. Created PRs in GitHub for basic bug fixes.
  • Initiated and managed a project to automatically identify incorrectly loaded plan details/rates which caught 8,000+ plan errors before they became client facing. Oversaw expansion of the project to other teams, training and supervising staff in its use.
  • Acted as subject matter expert throughout the company for carrier plans and rates.
  • Developed and implemented tools designed to identify, clean and prevent rate discrepancies system-wide.
  • Performed complex data analyses using SQL and Excel.

Product Specialist

Promoted

Jul 2016Nov 2016 · 4 mos

Senior Operations Specialist

Dec 2015Jul 2016 · 7 mos

  • Identified, diagnosed, and corrected carrier-related discrepancies in the system.
  • Performed root cause analysis of issues that these errors uncovered, leading to solutions in the product and operating practices.
  • Partnered with Product and Engineering teams to create new tools and processes that improved system quality.
  • Partnered with the Analytics group to automate and expand the discovery of system inaccuracies.
  • Collaborated with other arms of Carrier Operations to further ensure congruency of information between Zenefits and partners (e.g. Insurance carriers).
  • Developed and promoted tools for the analysis, prevention, and correction of errors.

Carrier Operations Analyst

Apr 2015Nov 2015 · 7 mos

Milliman

Actuarial Analyst

Feb 2012Apr 2015 · 3 yrs 2 mos · San Francisco Bay Area

  • Analyzed complex multivariate data from multiple sources to identify and develop coverage, benefit, and price changes.
  • Created sophisticated tools in Excel for internal use, providing the ability to quickly assess and analyze variables, including pricing structure and cost trends.
  • Developed and automated processes for comparative analysis using VBA and advanced Excel skills, thereby reducing human error, and speeding up completion time.
  • Negotiated favorable rates and terms with providers.
  • Directed and managed the RFP process on behalf of clients.

Unitedhealth group

2 roles

Senior Underwriter

Promoted

Feb 2011Feb 2012 · 1 yr · San Francisco Bay Area

  • Created and used models to predict impact of changes due to new state and federal policy regulations.
  • Analyzed health benefit plan characteristics and assessed risk to determine appropriate rate actions.
  • Redesigned new business templates and pricing tools for improved functionality using VBA and Excel formulas, saving hundreds of employee hours.
  • Independently conceived, designed and implemented a bulk pricing file in Excel combining our smaller clients, saving hundreds of employee-hours.
  • Completed new business quotes and determined appropriate rate actions for existing accounts based on analysis of client data.
  • Trained four new underwriters on our processes and pricing templates.

Underwriter

Oct 2008Feb 2011 · 2 yrs 4 mos · San Francisco Bay Area

Education

University of Michigan

Bachelor of Science (B.S.) — Mathematics of Finance and Risk Management

Jan 2004Jan 2008

Hackbright Academy

Computer Software Engineering

Jan 2017Jan 2017

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