Top Software Engineer Jobs in Philadelphia, PA

Develop and support full-stack software using C#, .NET Core, ReactJS, MVC, LINQ, REST APIs, and SQL Server. Responsibilities include designing, testing, deploying, troubleshooting, and upgrading applications; maintaining data feeds and interfaces; participating in software reviews; supporting continuous improvement; and collaborating with internal and external customers. The role is remote within the United States, requires US citizenship, may require security clearance eligibility, and may involve 5% travel.

Hands-on Delivery Engineer supporting customer implementations, integrations, technical demonstrations, production events, and issue resolution. The role translates customer and contractual requirements into technical solutions, investigates system behavior across APIs, configurations, logs, and data flows, and collaborates with engineering, product, implementation, operations, security, and infrastructure teams. It is designed for early-career technical talent developing broad expertise across customer delivery, technology, product, and support.

Lead architecture and technical direction across multiple engineering teams. Drive large-scale refactoring, domain decomposition, cross-team technical decisions, AI-native engineering practices, production coding, testing, observability, reliability, technical planning, and engineering standards. Mentor senior technical staff, influence hiring and leveling, and partner with Product, Design, and engineering leadership to deliver foundational platform improvements.

Develop, test, maintain, and support enterprise applications and services using C#, .NET, ASP.NET Core, Web API, Entity Framework Core, and SQL Server. Responsibilities include API and database integration, code reviews, automated testing, debugging, performance improvements, release readiness, production troubleshooting, and collaboration with product, architecture, QA, and operations teams.

Lead a cross-functional advertising engineering squad of backend and iOS engineers. Partner with Product and Design to discover, prioritize, and deliver consumer-facing ad experiences through experimentation. Manage backlog health, technical debt, delivery quality, and team ceremonies while coaching engineers and fostering an empowered, high-trust team. Support scalable, maintainable mobile applications and navigate privacy, consent, and advertising requirements.

Develop and modify 2D games with Defold and Lua, including game mechanics, player controls, UI, animations, debugging, and performance optimization. Complete advanced game development tasks, document workflows step by step, and create clear technical instructions and prompts for AI training. The role also requires screen recording and clear English communication.

Design and operate production infrastructure for AI agent systems, including high-performance Rust services for model inference, orchestration, and execution. Build scalable distributed systems, MLOps capabilities, observability, guardrails, and failure recovery for millions of users. Optimize latency, throughput, reliability, and cost while partnering with agent systems and infrastructure teams to harden experimental prototypes for production.

Build and maintain Soluna’s data center control systems and data infrastructure. Responsibilities include architecting Maestro, improving software testing and deployment practices, developing internal data products, managing AWS cloud infrastructure, debugging industrial interfaces, and creating reliable mission-critical applications using Elixir and other technologies.

Develop scalable Django back-end applications and RESTful APIs; design databases, schemas, ER diagrams, data flows, authentication, and authorization systems. Configure cloud infrastructure and production deployments, optimize PostgreSQL performance, write automated tests, and manage Linux servers with Bash, SSH, and shell scripting. Collaborate with cross-functional teams, document systems, and contribute to scalable architecture. This is a remote, unpaid internship requiring at least 30 hours weekly.

Build AI-enabled features for a legal technology platform, proactively improve products, and drive engineering projects from concept through completion. The role offers growth into independent contributor or engineering management responsibilities. The company focuses on using AI to support commercial contract negotiation and expand legal technology applications.