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1,589 systems software engineer jobs at 674 companies in Fairfield, CT

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Founding Full-stack / Product Engineer
Cupertino, CA, US
$130k-$300k/yr On-SiteFull Time
HiringCafe
HiringCafe: Building a 100× better job search engine to take on Indeed and LinkedIn.
Help us build a 100× better job search engine. We need a full-stack engineer with great taste, sharp fundamentals, and a track record of shipping polished product on React/Next.js plus a real backend (Firebase, Elasticsearch, Redis, Stripe).
React, Next.js, TypeScript, Firebase, Elasticsearch, Redis, Stripe
Help us #BeatIndeed & #BeatLinkedIn
1mo
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Software Engineer, Build Systems / CI
San Francisco or Seattle or New York City
$185k-$490k/yr OnsiteFull Time
OpenAI
OpenAI: Develops artificial intelligence models and generative AI software services.
5+ YOE5+ years of software engineering experience; building infrastructure or tooling for developers; experience with build systems (Bazel, Buck, Pants, Gradle); scale CI; cross-team collaboration; strong developer experience; distributed systems debugging.
Bazel, Starlark, Buildkite, Python, FastAPI, Kubernetes, Terraform, PostgreSQL, Kafka
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2mo
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Software Engineer - Options Trading Systems
New York, New York, United States
$175k-$250k/yr OnsiteFull Time
Summit Securities Group
Summit Securities Group: A systematic trading firm merging human intuition with machine intelligence.
5+ YOE5+ years in production software engineering; strong C++, systems fluency, networking; low-latency, high-performance focus.
C++, Networking, Socket programming, Multithreading
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1mo
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Senior Software Engineer, Agentic Systems
New York City, New York, United States
$150k-$300k/yr HybridFull Time
Asepha
Asepha: AI-native clinical automation platform for pharmacies.
5+ YOE5+ years software engineering experience with backend focus; proficiency in Python or TypeScript; experience with APIs, data stores, distributed systems, cloud infrastructure, and agentic AI systems.
Python, TypeScript, FastAPI, Flask, Redis, Kafka, SQL, NoSQL, vector databases, Azure, AWS, GCP
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1w
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Software Engineer - Systems
New York City or San Francisco or London
$200k-$275k/yr OnsiteFull Time
Spiral
Spiral: Building high-performance multimodal data infrastructure for AI systems.
5+ YOE5+ years systems programming experience, strong OS foundation, performance engineering, familiarity with Apache Arrow/Parquet/DataFusion/Clickhouse/DuckDB, PyTorch/CUDA understanding, Rust a bonus; able to work onsite in NYC, SF, or London.
Vortex, Apache Arrow, Parquet, DataFusion, Clickhouse, DuckDB, PyTorch, CUDA, Rust
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1mo
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Staff HPC Systems Software Engineer
New York City or United States
$225k-$275k/yr OnsiteFull Time
Nscale
Nscale: Vertically integrated AI infrastructure provider for high-performance computing.
Extensive experience designing and building Slurm-based HPC systems, strong software skills in Go or Python, deep knowledge of GPU infrastructure and HPC networking (InfiniBand, RoCE, RDMA), and experience integrating HPC with cloud-native platforms.
Slurm, Kubernetes, Go, Python, Kueue, InfiniBand, RoCE, RDMA
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2w
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Software Engineer, Geospatial Systems
Brooklyn, New York, United States
$150k-$220k/yr HybridFull Time
Paces
Paces: Software to accelerate renewable energy and power project development.
4+ YOE4+ years building data-intensive software; strong CS fundamentals; fluency in a systems/backend language; experience with DuckDB/Apache Arrow or comparable columnar systems; emphasis on performance, correctness, and computational geometry.
DuckDB, Apache Arrow, GeoArrow, Clay, Rust, C, C++, Zig, PostGIS, GDAL, GEOS, georust/geo, zarr, GeoZarr
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1mo
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Software Engineer, Systems ML
Bellevue or Menlo Park or New York
$184k-$257k/yr OnsiteFull Time
Meta
MetaNASDAQ: META: Develops social networking platforms and virtual reality technologies.
8+ YOEBachelor's or equivalent, 8+ years in systems engineering/ML infrastructure, experience with distributed ML training/inference, PyTorch/JAX/TensorFlow, low-level C++/CUDA optimizations, and leading cross-functional ML systems projects.
PyTorch, JAX, TensorFlow, C++, CUDA, MLIR, XLA, TVM, Triton
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2d
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Radar Systems/Software Engineer
Trumbull, Connecticut, United States
$105k-$170k/yr OnsiteFull Time
Technology Service Corporation
Technology Service Corporation: Develops advanced sensor systems and engineering solutions for defense.
5+ YOEB.S. in EE/Physics/CompE (M.S. preferred),5+ years radar and M&S experience,proficient in MATLAB,Python,C/C++,CUDA,VHDL,Windows/Linux,ability to obtain DoD Secret clearance,U.S. citizenship required.
MATLAB, Python, C, C++, CUDA, VHDL, Windows, Linux
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1mo
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Software Engineer, Trading Systems (C++)
New York City, New York, United States
$120k-$285k/yr HybridFull Time
Tower Research Capital
Tower Research Capital: Global quantitative trading firm developing automated algorithmic strategies.
Degree in CS/Engineering/Math/Physics, strong algorithms/data-structures and distributed systems foundation, excellent C++ (Python preferred), experience building low-latency/high-performance systems, interest in financial markets.
C++, Python, Rust, Linux, FPGA
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2mo
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Staff Software Engineer - Systems Intergration
Santa Monica or New York City
$200k-$220k/yr HybridFull Time
Pivotal Health
Pivotal Health: AI platform automating healthcare insurance claim disputes for providers.
7+ YOE7+ years backend software experience; owns architecture; builds ERP/CRM integrations; payments systems knowledge; distributed systems; greenfield work; strong communication.
ERP, CRM, Financial systems, Salesforce, NetSuite, Sage, QuickBooks
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1mo
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Software Engineer, Revenue Systems
New York City, New York, United States
OnsiteFull Time
Nomic
Nomic: AI platform for architecture, engineering, and construction workflows.
Senior IC with strong systems integration and data modeling; revenue-domain experience; Python/TypeScript production work; correctness-focused.
Python, TypeScript, HubSpot API, REST APIs, Webhooks, SQL
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2mo
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Software Engineer, Streaming Systems
New York or San Francisco
$180k-$320k/yr RemoteFull Time
Hightouch
Hightouch: Syncs customer data from warehouses to business and marketing tools.
Distributed systems and high-scale, real-time streaming experience; ownership mindset; startup environment; knowledge of Kafka/Kinesis/Pulsar is a plus.
Kafka, Kinesis, Pulsar, Warpstream
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1w
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Senior Software Engineer, Manufacturing Systems
Glen Cove, New York, United States
$180k-$210k/yr HybridFull Time
Standard Bots
Standard Bots: Develops and manufactures AI-powered robotic arms for industrial automation.
5+ YOE5+ years engineering experience; full-stack development with React/Typescript and Node.js/Python; PostgreSQL, GCP/AWS, Kubernetes, Docker; experience designing MRP/MES or production systems preferred.
React, Typescript, Node.js, Python, PostgreSQL, GCP, AWS, GraphQL, REST, Kubernetes, Docker
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2w
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Software Engineer, Design Systems
San Francisco or New York City
$160k-$270k/yr OnsiteFull Time
Assembled
Assembled: A workforce management platform for scaling customer support operations.
3+ YOE3+ years building frontend products, ownership of design systems, deep frontend expertise (TypeScript, component architecture, frontend tooling), strong product/design instincts, and collaboration skills; experience with AI-assisted development preferred.
TypeScript, React, Storybook, visx, D3, Chart.js
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3mo
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Software Engineer, Video Input/Output Systems
New York, New York, United States
$160k-$185k/yr HybridFull Time
Fubo
FuboNYSE: FUBO: Live TV streaming platform with a focus on sports.
3+ YOE3+ years backend software development; Go, Python, or Java; distributed systems; REST APIs; cloud (GCP/AWS); Kubernetes; observability.
Go, Python, Java, REST, SQL, Kubernetes, Terraform, Prometheus, Grafana, AWS, GCP
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1w
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Software Engineer - Infra & Systems
New York, New York, United States
$144k-$235k/yr HybridFull Time
Astronomer
Astronomer: Managed data orchestration platform powered by Apache Airflow.
0+ YOE0–4 years infra/platform engineering experience; Linux, networking, and at least one language (Python, Go, Bash); exposure to AWS/GCP/Azure or on-prem Kubernetes; Git and testing knowledge; strong written communication.
Terraform, Kubernetes, Golang, TypeScript, Python, Go, Bash, AWS, GCP, Azure, OpenShift, Git, Apache Airflow, Helm, CI/CD, Linux
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2w
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Principal Software Engineer: Distributed Systems (Config, Test, & Deployment)
Austin or New York City or San Francisco or Washington
$200k-$288k/yr HybridFull Time
Cloudflare
CloudflareNYSE: NET: Provides security and performance services for internet properties.
10+ YOE10+ years software engineering experience, technical leadership across orgs, expertise in distributed systems, strong typed language mastery, API design, experience with LLMs, Kubernetes, RocksDB and large-scale systems.
Kubernetes, RocksDB, LLMs, Prodspec and Annealing
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3mo
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Software Engineer, Machine Learning (Systems)
New York, New York, United States
$240k/yr OnsiteFull Time
Sweep
Sweep: Providing a cyber-physical defense layer for high-stakes security environments.
5+ YOE5–10 years building and operating production ML systems; strong Python; Go/TypeScript; cross-device and cloud experience; able to debug production systems quickly.
Python, Go, TypeScript, Kafka, LLM, APIs, Pipelines, Data Storage
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2w
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Senior Software Engineer, Distributed Data Systems
New York, New York, United States
$200k-$350k/yr OnsiteFull Time
Clera
Clera: AI talent agent matching professionals with high-growth startup roles
4+ YOE4+ years in data systems/backend/platform engineering; proficiency in Haskell and/or TypeScript; experience with distributed and big data systems (Apache Spark, Hadoop); strong algorithms and query optimization skills.
Haskell, TypeScript, Apache Spark, Hadoop
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3w
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Senior Software Engineer, Ontology & Reasoning Systems (819)
Connecticut or New York
$238k-$267k/yr OnsiteFull Time
Protegrity
Protegrity: Provides data-centric security and tokenization software for enterprises.
5+ YOE5+ years building backend systems; strong foundation in logic, discrete math and graph theory; experience with rule-based reasoning, knowledge graphs, LLM-powered pipelines, and production-grade engineering.
Python, Go, Java, Scala, Rust, LLMs, Datalog, Answer Set Programming, Prolog, SMT solvers, RAG, RDF, SPARQL, Neo4j, OWL, SHACL, CSP, vector search, property graphs
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