Top Software Engineer Jobs in Madison, WI

Lead scaling and performance of backend job processing and code execution systems. Write and review well-tested code, own features to production, improve throughput and multitenant fairness, mentor engineers, and influence technical direction across the stack.

Lead design and implementation of backend services and APIs for payments, billing, settlements, ledgers, and reconciliation. Drive architecture for highly available, auditable financial platforms, integrate with payment processors and banking partners, ensure transactional integrity, observability, and compliance. Deliver end-to-end initiatives, mentor engineers, and operate mission-critical systems with strong emphasis on reliability, security, and scalability.

Design, build, and maintain shared backend platform services (C#/.NET, Node/TypeScript, Postgres/Redis, AWS). Improve reliability, performance, observability, and CI/CD for high-throughput, transaction-heavy workflows. Collaborate with product, payments, data, and infra teams, drive architecture and rollout, mentor engineers, and adopt AI-assisted development practices.

Lead the design and development of Windows desktop applications, enforce best practices, drive accessibility efforts, and oversee the full feature lifecycle from conception to maintenance. Collaborate with design and QA teams, and resolve complex technical issues.

Design and implement control-plane services, CSI drivers, and tooling to provision and operate high-performance storage for Kubernetes AI/GPU workloads. Build observability, data-path, and automation (Terraform/OpenTofu, GitOps) for hybrid, bare-metal, and air-gapped deployments. Integrate enterprise and scale-out storage platforms and ensure secure, declarative provisioning across clusters.

Design and implement PostgreSQL internals and indexing strategies for large-scale document workloads. Extend query engine with BSON-aware operators and custom scan nodes, optimize index pruning, profile distributed system performance, collaborate with open-source communities, and lead design/code reviews.

Design and implement PostgreSQL internals, indexing, query engine extensions, and storage-layer features to support large-scale document workloads on Azure. Profile distributed systems, tune performance, collaborate with open-source communities, conduct design/code reviews, and drive cross-team alignment for mission-critical database features.

Design and implement PostgreSQL internals and indexing/query features for large-scale document workloads, extend query engine with BSON-aware operators and custom scan nodes, tune index pruning and storage, profile distributed systems for performance, collaborate with open-source DocumentDB/PostgreSQL communities, and participate in design/code reviews.

Design, architect, and implement cloud-first full-stack software using Java/C# and JavaScript frameworks. Provide technical leadership, mentor engineers, improve architecture and performance, promote CI and automated testing, and support customer implementation and cloud platform operations.

Own and improve Attentive's first-party data collection across the JS tag, Cloudflare Workers, and Java backend. Expand edge compute capabilities, build agentic AI systems to detect and fix data-quality issues, harden the event ingestion pipeline for reliability and observability, and lead technical direction on a small autonomous team while mentoring engineers.

Design, build, and maintain backend BI tooling, data pipelines, and platform features to generate operational metrics. Improve code quality, scalability, reliability, and performance; implement testing strategies; translate business requirements into technical plans; and mentor junior engineers while collaborating with product and stakeholder teams to deliver data-intensive analytics and reporting solutions.

Lead design, development, and deployment of scalable, fault-tolerant cloud-native microservices. Own architecture, mentor engineers, run on-call rotations, triage production incidents, optimize performance, and collaborate with product and stakeholders to deliver full‑stack and mobile solutions.

Design, implement, and maintain custom test frameworks for Illumina's primary analysis software. Create and expand automated tests, troubleshoot CI/CD pipelines, investigate failures, collaborate with developers to diagnose root causes, and ensure tests are reproducible, documented, and maintainable as analysis capabilities evolve.

Design and develop native Sage Intacct payment integrations and AR/AP workflows, implement APIs/SDKs, ensure PCI-compliant secure architectures, troubleshoot integration issues, collaborate with product/support teams, produce documentation, and monitor/optimize integration performance.

Design, build, and own disposable isolated microVM sandboxes and related runtime infrastructure for AI coding agents. Improve reliability, performance, and security across macOS, Windows, and Linux; lead architecture, mentor engineers, engage open-source communities, participate in on-call rotations, and collaborate with Product and adjacent teams.

Lead design and implementation of scalable data ingestion, transformation, and search systems for security telemetry. Build and maintain event-streaming pipelines, integrate third-party data sources, partner with product stakeholders, apply AI agents for data mapping and correlation, set engineering standards, improve observability and testing, and mentor junior engineers.

Architect and implement latency-critical protocol components (consensus, state sync, mempool) in Rust. Build fault-tolerant distributed systems, optimize throughput and latency, collaborate with research/product, debug live systems, and contribute testing, benchmarking, and release standards.

Lead design, build, and operation of AI-powered product features across backend, frontend, and AI systems. Make architecture decisions, drive production deployments, improve code quality and reliability, mentor engineers, and own features end-to-end.

Provide technical leadership and hands-on engineering across AI, data, backend, and frontend systems. Drive architecture, remove technical risks, set engineering standards, mentor senior engineers, and influence cross-team technical direction.

Lead company-level technical direction for an AI-native insurance platform. Own architecture across AI, data, infrastructure, and product; resolve high-impact technical decisions; establish org-wide engineering standards; and mentor senior engineers while partnering with founders to shape long-term technical vision.

Lead architecture and implementation to scale a large Kubernetes-native microservice platform into cell-based deployments. Decompose services, build shared libraries and configuration frameworks, enable private/isolated cloud deployments, land changes in product services, set architecture patterns, partner with Cloud Platform/SRE/DevEx, mentor senior engineers, and embed AI tooling into development workflows.

Lead technical strategy to scale a multi-ecosystem libraries platform: generalize package indexing, build orchestration, and remediation automation from CVE detection to verified release. Drive agentic/AI-driven patch generation, set platform architecture and SLOs, mentor senior engineers, own incident response, and get hands-on resolving toolchain, compiler, and packaging failures for new ecosystems (.NET, Go, Rust).

Lead cross-functional teams to define and evolve platform and application architecture, introduce new technologies and best practices, solve cross-team technical challenges, guide global cloud and regulated (FedRAMP) deployments, and mentor engineers while driving engineering quality, observability, and production readiness.

Lead design and implementation of large-scale Pub/Sub and messaging services within Azure Event Grid/Microsoft Fabric. Define scalable, reliable architectures, drive testing and CI/CD automation, build developer tooling, mentor engineers, manage incident response and operational excellence, and collaborate with PMs, EMs, researchers, and customers to deliver production-ready cloud services.

The Senior Software Engineer designs and develops complex features within OneStream solutions, ensuring technical excellence and mentoring other engineers. Responsibilities include architectural design, UI development, API creation, performance improvements, and collaboration across teams.