Top Software Engineer Jobs in Milwaukee, WI

Senior individual contributor responsible for designing and building complex, customer-facing product features. Own technical decisions within product areas, collaborate with Product and Design, contribute to architecture, maintain code quality, mentor engineers, and participate in production support.

Design, build, and launch backend services to process and analyze clinical data at scale. Collaborate cross-functionally, enforce secure coding and privacy, support production systems, and drive technical improvements.

Technical leader for Android-native POS and handheld apps: define architecture, ensure offline-first reliability, drive cross-squad initiatives, mentor engineers, improve performance and developer productivity, and ship resilient, high-scale hospitality workflows.

Senior Java engineer responsible for designing, developing, and maintaining scalable, secure backend systems using Java and modern frameworks. Participate in architecture, collaborate with product and security teams, write maintainable code, and adopt AI-assisted development tools while contributing to open-source efforts.

Build and operate scalable backend services and distributed systems for global payments. Design payment orchestration, ledgering, workflow engines, partner integrations, and public APIs. Own end-to-end projects, influence architecture and engineering standards, mentor teammates, and collaborate with product and engineering leadership to ship production-grade infrastructure.

Design and build scalable backend services and distributed systems powering global payments. Develop payment orchestration, ledgering, workflow engines, partner integrations, and public APIs. Influence architecture, own projects end-to-end, collaborate with product, mentor engineers, and operate production systems.

The role involves designing and developing scalable backend services using Java and Spring Boot, leading a team, and optimizing performance in Azure environments. Responsibilities include event-driven systems design, mentorship, and championing best practices.

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 native Windows desktop applications, ensuring quality, performance, and accessibility while collaborating with cross-functional teams.

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, build, and scale backend data infrastructure for an at-home EEG and diagnostics platform. Own PostgreSQL schemas, Kafka-driven event pipelines, GraphQL APIs, dataset snapshot pipelines to the warehouse, and integrations across platform and application teams. Ensure data integrity, idempotency, and operational robustness while collaborating with product, scientific, and clinical stakeholders.

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.

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.

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.

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.