Top Senior Software Engineer Jobs in Milwaukee, WI

Lead design and delivery of customer-facing data product applications, building full-stack experiences (frontend, backend, APIs) using TypeScript, React, Node.js, and Python. Partner with Product and data teams to convert analytics and prototypes into production-grade workflows, establish software engineering best practices, mentor engineers, and prioritize customer value through testing, observability, and operational ownership.

Design, build, and maintain performant web applications in an agile, TDD-driven environment. Lead technical decisions, collaborate with product and design, deliver high-quality code, participate in on-call rotation, and ensure system reliability and availability.

Design and scale core infrastructure for an exchange platform focusing on latency and performance, while building APIs and managing technical relationships with clients in the sports prediction market.

Lead design, implementation, and operation of Signifyd's GCP/Kubernetes cloud platform. Architect scalable, secure infrastructure, embed AI-driven automation, own SLOs and incident response, improve developer experience via CI/CD/GitOps tooling, mentor engineers, manage cloud capacity/FinOps, and build observability and security into the platform.

Build and own device fingerprinting and fraud detection capabilities for Stytch on Twilio. Partner with product and engineering leadership to define roadmap, author design docs, drive technical decisions, improve production resilience, and mentor other engineers. Operate with high ownership across cross-team integrations and on-call responsibilities.

Design, implement, and maintain scalable Java-based software solutions. Collaborate across the SDLC, drive feature development, conduct code reviews, support CI/CD and DevOps practices, and ensure system performance, security, and reliability.

The Senior Software Engineer will build full-stack solutions, design scalable features, mentor team members, and manage the development lifecycle.

Lead design and development of highly available payment processing, subscription billing, settlement, refunds, and reporting systems. Integrate with external payment processors and APMs, ensure automated build/test/deploy pipelines, debug production issues, optimize performance, decompose features for incremental releases, conduct design/code reviews, mentor junior engineers, and incorporate regulatory requirements (PCI‑DSS, PSD2/SCA, 3DS2).

Lead frontend architecture and technical direction for shared UI systems and design system. Build, maintain, and document reusable component libraries; collaborate with UX, product, and engineering. Champion accessibility, testing, performance, and design-to-code workflows. Mentor engineers, review contributions, and deliver major UI initiatives end-to-end while balancing technical debt and product needs.

Lead design, build, and launch of a React Native companion app integrated with a unified TypeScript monorepo. Ship full-stack features across accessible React UIs, type-safe APIs, and GraphQL; own releases, observability, and post-release iteration. Mentor engineers, improve CI/CD and testing, and ensure accessibility and reliability in a regulated healthcare compliance platform.

Own and evolve high-scale backend and data-layer services. Design, build, test, and operate distributed backend services and APIs, improve reliability/latency/scale, take end-to-end ownership from design through production support, participate in on-call and incident response, and mentor peers while partnering with Product and SRE teams.

Lead full-stack development using React, Node and TypeScript. Design scalable architecture, write and review code, ensure performance, accessibility and security, mentor off-shore teams, participate in Agile ceremonies, support production (including weekends/off-hours), and collaborate with cross-functional teams to deliver business-critical applications.

Design, build, deploy, and operate backend services, APIs, integrations, and web applications. Own end-to-end features, improve CI/CD and observability, troubleshoot cross-service issues, participate on-call, and collaborate with product and leadership to deliver reliable production systems.

Build and scale ML-optimized HPC infrastructure, manage Kubernetes-based GPU/TPU superclusters, optimize for AI/ML training, and mentor teams while innovating in ML infrastructure.

Design, build, and maintain scalable backend services and APIs for loan origination and servicing. Own features end-to-end, improve performance, reliability, CI/CD, mentor engineers, and translate complex financial requirements into reliable technical solutions.

Lead modernization of internal platform tooling to 12-factor apps, delivering full-stack services (Go/Python + React/Vue), instrumenting observability (Grafana/Prometheus/Loki), driving Kubernetes-native GitOps (ArgoCD/GitLab CI), mentoring developers, and automating infrastructure with Ansible/Terraform on private/bare-metal clouds.

Design, develop, and maintain complex, enterprise-scale software features and services across the OneStream CPM platform. Lead technical design, implement UI and APIs, ensure JSON/XML contract compatibility, improve performance and reliability, mentor engineers, participate in code reviews, and support CI/CD, testing, and production operations. Use AI-assisted development tools responsibly to accelerate development.

Own and evolve Roo's frontend platform: design system, shared UI architecture, developer tooling, and AI-assisted workflows. Lead migrations, React/React Native modernization, Expo adoption, and developer experience improvements. Partner with Product and Design to make components effortless to consume by engineers, designers, and AI agents, and remove platform friction to increase engineering velocity.

Design, build, and maintain secure microservices and data pipelines for analytics and alerting across a cloud-native identity platform. Implement IaC (Terraform) on Azure, develop CI/CD pipelines, optimize data flows and storage, ensure observability and security, conduct reviews, and mentor engineers.

Design, build, and own large-scale distributed backend systems in Go to process billions of events and petabytes of data. Lead architecture, reliability, observability, and performance efforts; improve service communication and data pipelines; debug production at scale; mentor engineers and share learnings publicly.

Design and build the planning and customer operations portal: geospatial routing and siting algorithms, automated permitting integrations, and deployment/customer dashboards. Implement backend services (TypeScript/Node), front-end features (React/TypeScript), and cloud infrastructure (Docker, Helm, Kubernetes, AWS) to accelerate hardware deployments and provide visibility into installations and fleet health.

Lead full‑stack modernization of a legacy .NET/SQL Server payment-integrity platform. Build modular Angular frontends and resilient .NET microservices, improve APIs, optimize database performance, embed security/privacy, use AI coding agents to accelerate refactors, and drive delivery with strong observability and testing practices.

Build and maintain C#/.NET Revit add-ins and Revit-integrated desktop apps that export model data to the Stratus platform. Solve Revit-specific challenges (version compatibility, threading, performance), integrate with backend services (Azure ServiceBus), manage installers/updates, triage customer bugs, write tests, and collaborate with product and customer teams. Use AI-assisted dev tooling as part of the development workflow.

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 and mentor engineering teams to design and deliver scalable, high-performance systems. Define technical roadmaps, set code quality standards, drive architecture and technical debt resolution, collaborate with Product and Design, make technology decisions, lead hiring and interviews, and research new tools to solve complex problems while advocating for engineering priorities and timely feature delivery.