Software Engineer Senior

Jeff Smith

Lincoln, NE, USA ***.*****.***@*****.*** 402-***-**** in/jeffest-smith

SUMMARY

Innovative Senior Software Engineer with a willingness to be humble, a passion for improving culture while delivery high quality automation and system design possible. Looking to take control of my future and provide a place of diversity and equity as a Staff Software Engineer to take my career to the next chapter.

EXPERIENCE

Contract Developer

Driive March 2025 - June 2025, Lincoln, Ne

Led full-stack development for an early stage start-up using Elixir, Phoenix, and LiveView, architecting and implementing core application features, robust scheduling systems, and interactive UIs.

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Spearheaded the design, implementation, and maintenance of complex third-party API integrations (GraphQL & REST), including Jobber and Zapier, focusing on schema analysis, OAuth2, error handling, and data integrity.

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Drove UI/UX development with Phoenix LiveView, creating responsive and user-friendly components for key application areas like service management and ensuring consistent user experiences.

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Contributed significantly to system architecture and technical planning for major initiatives, including a frontend migration to React/Vite and the design of an AI-powered form assistant.

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Championed and enforced high standards for code quality, testing protocols, and Elixir best practices, ensuring system stability, maintainability, and adherence to strict development guidelines.

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Senior Software Eng

Logitix January 2024 - November 2024, Boca Raton, FL Full stack web application and infrastructure development using GIT, ADO, Angular, Typescript, MsSQL, Kibana, and RabbitMQ enterprise messaging systems to communicate between ticket brokerages.

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Assigned as primary contact for the contracting company currently developing the redesign existing front-end from razor to Angular while maintaining company coding standards focusing on BDD.

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Standardized coding and naming conventions for entire codebase using industry best practices, ensuring cohesive team adherence and improved code maintenance and creating reliable services.

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• Involved in creation and refinement of tickets for future work along with release planning and post release production monitoring.

• Extensive work implementing 3rd party API’s for different ticket brokerages brokerages operated with. Optimized database performance tuning and backend lambdas, achieving a 30% reduction in query execution time over a 6-month project using MsSQL, leading to faster data retrieval for brokerages.

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Debugged critical backend issues impacting data to resolve synchronization across multiple platforms, achieving a 15% decrease in error resolution time using MsSQL and Angular debugging tools over a 3-month period.

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Mitigated software defects by 25% over a 4-month project, implementing automatic error-handling mechanisms using clean, scalable, relational databases side by side with integrated Entity Framework and MsSQL to enhance data integrity across ticket brokerage systems.

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• Engineered scalable data stores solutions within 9 months, optimizing storage efficiency by 20% through integration of streamlined operations. Analyzed threat actor behaviors within application infrastructure to improve security protocols, leading to a 40% reduction in potential vulnerabilities over a 7-month period using MsSQL and Angular security features.

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Senior Software Eng.

Qrails – Short-term Contract August 2023 - February 2024, Denver, CO

• Full stack web application and infrastructure development using ADO, MS SQL, .Net Framework, C#, ES7, Cypress, React and Typescript. Primary focus to update existing documentation and standards after COVID layoffs and using previous skills and technical insights to provide technical design feedback on the current state of the code quality.

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• Integration and maintenance of 3rd party FinTech API's while researching and planning new tickets and epics. Senior Software Eng. I

Olo December 2022 - June 2023, New York, NY

Full stack web application and infrastructure development using GIT, Team City, Octopus, MS SQL, Amazon Redshift, .Net Framework, C#, ES7, React and Typescript.

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Primarily assigned the integration and addition of new code to allow for Vendors to quickly add new concept restaurants, manage scheduling to the platform and unify duplicate windows and microservices.

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Engineered and optimized backend services using Node.js and .Net Framework to reduce response times by 30%, enhancing vendor onboarding efficiency by allowing for real-time data processing.

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Integrated MongoDB to handle real-time data persistence for user profiles, reducing fetch time by 40% and supporting scalable storage solutions in high-traffic applications using Node.js.

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Directed deployment schedules and code reviews using GIT and Team City, ensuring seamless, organized software roll-outs with a 20% increase in on-time project delivery.

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Software Engineer III

Spreetail July 2020 - October 2022, Lincoln, NE

• Full stack web application development using GIT, AZURE, AKS, MS SQL, C#, Entity Framework, .NET/.NET CORE, REST, ES7, React and Typescript.

• Implemented unit testing improvements, decreasing deployment time by 25% and enhancing A/B testing capabilities for rapid feature validation.

• Upgraded in-house Product Management UI design libraries across multiple products from Javascript to Typescript using React library.

• Led improvements on existing code bases with Stateless, Gitlab CI/CD, AKS monitoring and logging, and scalable design practices. Engineered comprehensive performance profiling and tuning processes utilizing Visual Studio Profiler, enhancing application efficiency by 30% in 6 months across multiple projects.

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Designed and developed performant solutions leveraging optimizer techniques in .NET 6, improving application load speeds by 40% over a 12- month period.

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Integrated DataDog monitoring tools into existing infrastructure to enhance application performance monitoring, achieving a 25% reduction in downtime frequency and improving system reliability over 8 months.

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Software Developer

Sandhills Global January 2025 - July 2020, Lincoln, NE Implemented full stack architectural patterns with MS SQL and VB.NET, leading to a 30% reduction in processing time through enhanced database payroll transactions.

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Transformed backend architecture from VB.NET to C#, improving scalability and maintainability, while aligned with latest tech trends now leveraging framework innovations.

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• Enhanced user interface functionality using React, increasing user engagement by 25% through intuitive and responsive design improvements. Analyzed potential fraud patterns using real-time data logging and machine learning, increasing fraud detection rates and fighting spam for sellers by 40% within a 6-month project utilizing Python and TensorFlow.

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PROJECTS

Jobber API Integration (GraphQL

Driive • June 2025 - June 2025

Led the end-to-end integration process, from initial schema discovery and documentation (object relationships, field mappings) to full implementation and ongoing maintenance.

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• Implemented robust OAuth2 authentication using Ueberauth, including token management and refresh logic. Developed a modular GraphQL client (jobber_graphql_client.ex) and context modules (Driive.Jobber) to handle API interactions for various resources (visits, jobs, properties).

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Engineered data extraction and transformation logic (DataExtractor.extract_address/1) to ensure compatibility between Driive and Jobber schemas, addressing NON_NULL constraints and data formatting issues.

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• Implemented asynchronous workers (JobberVisitWorker) for background data synchronization tasks. Diagnosed and resolved critical bugs related to pattern matching errors (e.g., FunctionClauseError with nil values), type mismatches, and incorrect data propagation, ensuring accurate address handling for properties.

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• Adhered to strict API integration rules, including pre-implementation schema analysis, type definition, and comprehensive error handling. Zapier API Integration (REST and Webhooks)

Driive • May 2025 - May 2025

• Architected and implemented the Zapier integration from scratch.

• Developed OAuth 2.0 endpoints (/api/v1/oauth) for secure authentication and authorization, including token and refresh mechanisms. Created Zapier-specific API endpoints (/api/v1/zapier) for triggers (e.g., new booking, updated booking) and actions (e.g., create booking, update booking).

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• Designed and implemented a webhook system for real-time event notifications (e.g., booking.created, appointment.updated).

• Implemented rate limiting and a data transformation layer to ensure API stability and provide Zapier-friendly JSON responses. Agent Scheduling System Enchancements

Driive • April 2025 - May 2025

Analyzed and implemented business logic for agent scheduling boundaries (start_of_day_boundary, end_of_day_boundary) with :arrive_by and :leave_by options.

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• Correctly implemented the 15-minute buffer logic based on these boundary settings to ensure accurate appointment availability. Developed and utilized a debug script (debug_buffer_settings.exs) to test and verify all combinations of boundary settings directly against the database, ensuring correct behavior without modifying production code.

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• Worked with DriiveWeb.Utils.AvailabilitySchedule and related calendar contexts (Driive.Calendars) to integrate these rules. Design and update of customer management and POS systems Logitix

Collaborated with contracting teams to create pragmatic technical solutions to transition key legacy systems from Blazor to Angular and update back end API endpoints to facilitate new requirements, successfully within 6 months using Git and CI/CD pipelines.

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Designed advanced POS system enhancements, leveraging proficiency in C# and .NET Framework to boost transactional processing by 15% over three consecutive iterations.

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Implemented full-stack standards on the project along with creating documentation covering the updates while delivering features of high organizational importance in the requested timeframes with high level of autonomy and ability to choose standards for future development.

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Contributed in extending scalable data models between distributed systems while matching design principles across each, ticketing new technical choices on on surfacing technical items as the company continued to increase in scale while pairing closely with the Staff Software Engineer.

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Stateless Implementation - Invoicing

Spreetail

Developed a proof-of-concept for the entire invoicing system while considering existing and emerging technologies, enhancing invoicing accuracy and reducing data retrieval times by 20% through .NET integration.

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• Streamlined state transition logic with .NET 6, enhancing invoice processing workflow speed and increasing operational efficiency by 30%. Facilitated cross-functional team collaboration using effective communication to implement core invoicing features via Stateless, resulting in successful same-day completion.

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State Machine Improvements - Import Ordering

Spreetail

• Optimized import order process through state machine refactoring, resulting in improved execution efficiency by 20%. Coordinated with a team of 3-4 developers for efficient project completion, providing architectural guidance, ticket tracking with led to release within two 2-week sprints using Agile methodologies.

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Refined state machine logic for import ordering by implementing advanced patterns in C#, resulting in a 30% reduction in error rates and seamless scalability for future enhancements.

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Payment Date Calculations - Invoicing

Spreetail

Undertook ownership of Assisted Invoicing application and led a small team varying experience in solving existing issues and new features. Focusing on quality, detailed oversight and mentoring the junior members to be comfortable in the system.

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Identified a critical flaw in date computations for direct import orders after extensive digging, preventing estimated monthly losses over $10 million by implementing corrective measures with MS SQL and .NET.

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Optimized invoice generation workflow in the automatic payment date calculations, reducing calculation errors by 20% and streamlining team output in a two-week sprint.

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Bulk Order Editing

Spreetail

Introduced performance optimizations in React by fine-tuning state management and implementing efficient data handling techniques using React libraries, enhancing application load speed by 30%.

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Developed backend systems with C# employing Command Handler design patterns, streamlining bulk order processing by 35% while modernizing the API and removing redundant codes that contributed to memory spikes.

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• Implemented logging and testing standards for the codebase. SKILLS

Infrastructure & Tools: Team City, Octopus, Azure, AKS, Gitlab CI/CD Front-end Development: React Query, React Hook Forms, Front-end redesign from Razor to Angular, Phoenix, CSS standardization Full Stack Development: GIT, ADO, Angular, Typescript, MS SQL, Kibana, .Net Framework, C#, ES7, Cypress, React, VB.NET, REST, React, ES6, JQuery, ElasticSearch, Elixir, Webhooks, Rate Limiting Databases: MS SQL, Amazon Redshift, PostgresQl

Other: Leadership Development, Project Management, API Integration, Code Modernization

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