Jonathan Daniel Kajewski
White Bear Lake,MN
Summary
Dynamic Senior/Staff Software Engineer with over 4 years of experience leading external API and platform initiatives in the transportation logistics sector. Expertise in designing and scaling microservices, GraphQL/REST APIs, and event-driven architectures, alongside seamless integration of enterprise SaaS solutions like Salesforce with product services. Proven ability to build automation tools and comprehensive documentation that enhance delivery speed and boost developer productivity. Recognized as a trusted mentor and collaborative partner across Product, Infrastructure, and Operations teams, consistently delivering resilient, cloud-native systems using technologies such as TypeScript/Node.js, Kafka, CI/CD, and GraphQL.
Overview
9
9
years of professional experience
Work History
Staff Software Engineer
Mastery Logistics
11.2024 - Current
- Contributed to the architecture and implementation of an asynchronous, Kafka‑enabled microservices api integrating third‑party systems with internal services, maintaining consistent, versioned API contracts across customer‑facing interfaces to meet high‑throughput demands.
- Improved scalability by instituting service standards, deep observability, and targeted performance tuning, including a 6x latency reduction on a critical validation flow.
- Standardized delivery pipelines by defining and enforcing CI/CD automation and policy via GitHub Actions, increasing release velocity and reliability.
- Aligned with Product by planning and architecting features and enhancements that maintain parity between backend capabilities and the UI for a coherent end-to-end experience.
- Enabled AI workflows by designing an MCP-based server to wrap REST APIs, unlocking natural-language automation and LLM-driven integrations across the platform.
- Delivered key wins including re-architecting a Data Dictionary Term validation service, creating a CLI for API/service topology visualization, and shipping shared mapper packages for uniform SaaS integrations.
Senior Software Engineer
Mastery Logistics
06.2022 - 09.2024
- Architected logistics services by designing microservices with an emphasis on throughput, reliability, and long-term maintainability.
- Delivered flexible APIs by implementing GraphQL and REST endpoints with strong contract governance, and feature flags for safe, incremental rollouts.
- Unified API discovery by building a centralized OpenAPI document service that standardized contracts and improved discoverability across dozens of microservices.
- Advanced platform tooling by driving adoption of enterprise feature flagging, API topology visualization, and centralized documentation to strengthen operability.
- Hardened release quality by migrating tests to Jest and introducing pre-release versioning workflows within CI/CD to reduce risk and improve release confidence.
- Drove cross-functional alignment by collaborating with Product, Operations, and business stakeholders to ensure designs met large-scale TMS requirements and outcomes.
Software Engineer
Mastery Logistics
11.2020 - 06.2022
- Shipped maintainable features by implementing services and APIs using team standards and CI/CD, meeting quality, coverage, and coding guideline targets.
- Automated repetitive work by streamlining recurring tasks, producing clear documentation, and supporting incidents with SLA adherence and root-cause remediation.
- Implemented secure designs by aligning user stories to proven patterns and incorporating observability to ensure scalable, supportable solutions from the outset.
- Practiced agile delivery by engaging in ceremonies, surfacing blockers early, and delivering changes in small, CI-friendly increments.
- Partnered across teams by collaborating closely with engineers and product partners to right-size tasks, clarify dependencies, and maintain predictable delivery.
Salesforce Developer
Securian Financial
01.2017 - 01.2020
- Enhanced Contact Center efficiency by designing and developing Lightning Web Components that consolidated multiple internal system integrations across business lines into a single interface, reducing Average Handle Time (AHT), creating a consistent service rep experience across business lines, and improving overall customer experience.
- Built scalable backend services by developing and deploying Apex classes, controllers, and triggers to support automation, data validation, and real-time contact center workflows.
- Improved test quality by designing a reusable test data creation framework, increasing unit test coverage and reducing developer rework.
- Streamlined integrations by consuming internal REST APIs through the enterprise API Gateway and developing custom Apex web services for the Genesys IVR, enabling accurate call routing and seamless data synchronization across Salesforce and external platforms.
- Optimized data availability by engineering Java batch jobs with Salesforce Data Loader CLI to process hundreds of thousands of nightly record loads, ensuring timely and accurate information for agents.
- Supported continuous improvement by troubleshooting production issues, delivering bug fixes, and implementing minor enhancements in collaboration with business stakeholders.
- Drove platform adoption and best practices through thought leadership on reusability, process optimization, and Salesforce platform governance within the Enterprise Contact Center.
- Configured core Salesforce features (custom objects, fields, page layouts, validation rules, workflows, Flows, and Process Builders) to align with evolving business needs.
- Maintained data integrity during data model expansion by merging and cleansing records, ensuring accuracy across integrated systems.
- Contributed to Salesforce DevOps with partial ownership of bi-weekly production deployments/releases, demonstrating expertise in metadata management and release management best practices.
Education
B.S. - Computer Science
St. Cloud State University
St. Cloud, MN01.2016
B.S. - Computer Science
Metropolitan State University of Denver
Denver, CO05.2014
Associate of Science - Chemistry
Front Range Community College
Westminster, CO01.2013
Skills
- Backend Engineering: Microservices, Distributed Systems, Event-Driven Architectures, API Design (REST & GraphQL)
- Enterprise Integrations: SaaS Platforms, CRM Systems, Middleware, API Gateways
- Languages & Tools: TypeScript, Nodejs, Kafka, Docker, Postgres, GitHub Actions, KEDA
- Cloud & DevOps: CI/CD Pipelines, Containerization, Azure Event Hubs
- Collaboration: Stakeholder Management, Agile Delivery, Cross-Team Leadership, Mentorship
- Software architecture design
- Design and development
- Functional and integration testing
- Detail-oriented
Languages
Spanish
Native or Bilingual
Timeline
Staff Software Engineer
Mastery Logistics
11.2024 - Current
Senior Software Engineer
Mastery Logistics
06.2022 - 09.2024
Software Engineer
Mastery Logistics
11.2020 - 06.2022
Salesforce Developer
Securian Financial
01.2017 - 01.2020
B.S. - Computer Science
Metropolitan State University of Denver
B.S. - Computer Science
St. Cloud State University
Associate of Science - Chemistry
Front Range Community College