|
📣 HiringCafe is hiring a Founding Growth Hacker! Learn More · Apply here

Limited-index browse page

Python Software Developer Jobs in Kittery, ME, US

290+ python software developer jobs from 77 companies hiring in Kittery, ME, US.

296 jobs- Kittery • 50 miles
3mo
Save
Mark Applied
Hide
Principal Full-Stack Software Engineer - Fidelity Private Shares
Westlake or Jersey City or Merrimack or Smithfield
$107k-$216k/yr HybridFull Time
Fidelity Investments
Fidelity Investments: Provides investment management, retirement, and brokerage services.
Experience building, deploying, and supporting web apps; Python, JavaScript/TypeScript; CI/CD; GitHub/Jenkins; leadership and mentoring; strong problem solving and automation.
GitHub, Jenkins, Python, JavaScript, TypeScript, CI/CD
1mo
Save
Mark Applied
Hide
Embedded Software Engineering Co-op
Lawrence, Massachusetts, United States
OnsiteFull Time, Internship
Fresenius Medical Care
Fresenius Medical CareNew York Stock Exchange: FMS: Provides dialysis services and manufactures renal care medical devices
0+ YOEPursuing BS in Computer, Electrical, or Software Engineering; experience in C/C++, Python; embedded software development; ability to read schematics; familiarity with software development processes.
C/C++, Python, Embedded systems, Linux, Windows, Git, Debugging
2mo
Save
Mark Applied
Hide
Embedded Software Engineer II (Andover, MA)
Andover, Massachusetts, United States
$90k-$135k/yr OnsiteFull Time
Smith & Nephew
Smith & NephewLondon Stock Exchange: SN: Designs and manufactures technology for tissue repair and replacement.
2+ YOE2+ years embedded C/C++ in Linux, strong hardware interfaces, CI/CD, testing, and experience in regulated medical devices.
C/C++, Linux, Embedded Linux, MATLAB, Jenkins, GitLab CI, Python, Shell scripting
2mo
Save
Mark Applied
Hide
Sr Principal Engineer (Software HIT Test)
North Andover or Massachusetts or United States
$145k-$155k/yr HybridFull Time
Fresenius Kabi
Fresenius KabiXETRA: FRE: Provides medicines and technologies for infusion and clinical nutrition.
8+ YOE8+ years in software engineering, testing for medical device software; strong C#, .NET, SQL Server; CI/CD; automated and exploratory testing; FDA process knowledge is a plus.
C#, .NET Framework, .NET Core, SQL Server, Windows Services, Web Services, Selenium, Playwright, Cypress, Python, JavaScript, Git, CI/CD, Azure, AWS, GCP, Kubernetes, VMware
1mo
Save
Mark Applied
Hide
Full Stack Software Developer
Salem, New Hampshire, United States
OnsiteFull Time
Analogic
Analogic: Provides imaging and detection technology for healthcare and aviation.
7+ YOE7–10+ years software engineering; strong Java, Python; microservices; cloud-native; IaC; CI/CD; Docker/Kubernetes; AWS; Agile; strong communication.
Java, Python, Go, Terraform, CloudFormation, Ansible, GitLab, Docker, Kubernetes, AWS, MQTT, AWS Greengrass, Infrastructure as Code, CI/CD pipelines
2w
Save
Mark Applied
Hide
Software Engineer Embedded/Network Systems II (Full Time) - United States
San Jose or New York City or Boston or Knoxville or Austin or Milpitas or Alpharetta or Raleigh - RTP or Maynard or Fulton or Dallas or Atlanta or Hillsboro
HybridFull Time
Cisco
CiscoNASDAQ: CSCO: Develops and sells networking hardware and cybersecurity software.
0+ YOEProficiency in C, embedded Linux, networking concepts; scripting with Python/Bash; CI/CD; DevSecOps practices; degree or certification with relevant experience.
C, Embedded Linux, Python, Bash, Jenkins, GitHub Actions, CI/CD, DevSecOps, Networking, Operating Systems
2w
Save
Mark Applied
Hide
Sr. Software Test Engineer
Andover, Massachusetts, United States
OnsiteFull Time
OSI Systems
OSI SystemsNASDAQ: OSIS: Manufacturer of electronic systems for security and healthcare markets
7+ YOEBachelor's degree in Computer Science or engineering; 7+ years software testing; 5+ years test automation; strong Windows/Linux, on-prem and cloud; Python, shell, REST APIs; Docker a plus; security clearance ability.
Python, Shell, REST APIs, Docker
1mo
Save
Mark Applied
Hide
Senior Quality Engineer - Virtual Machine Monitor
Promontory or Burlington or Bellevue
$108k-$192k/yr RemoteFull Time
Broadcom
BroadcomNASDAQ: AVGO: Designs and sells semiconductors and infrastructure software to enterprises.
6+ YOE6+ years in software development and quality engineering; proficient in Python and C; Linux; CI/CD; DevOps tools; virtualization knowledge.
Python, C, Linux, Jenkins, GitHub, JIRA, Review Board, CI/CD
1w
Save
Mark Applied
Hide
Pitco Frialator LLC - Software Engineering Intern
Bow, New Hampshire, United States
OnsiteInternship
Pitco Frialator
Pitco FrialatorNASDAQ: MIDD: Manufacturer of commercial deep fryers and restaurant cooking equipment.
Pursuing a degree in Mechanical, Electrical or Software Engineering; knowledge of C/C++; Python encouraged; read technical docs; lift up to 40 lbs.
C, C++, Python, embedded systems, CI/CD
2mo
Save
Mark Applied
Hide
Senior Cloud Developer - Virtualization
Fort Collins or Spring or Andover
$144k-$273k/yr HybridFull Time
Hewlett Packard Enterprise
Hewlett Packard EnterpriseNYSE: HPE: Provides edge-to-cloud computing platforms and enterprise IT infrastructure.
7+ YOESenior cloud developer with 7-10 years of experience in cloud architectures and microservices; proficient in Python, Java, Golang, or JavaScript; Kubernetes experience.
Python, Java, Golang, JavaScript, Kubernetes, Docker, Microservices, Cloud-native
2w
Save
Mark Applied
Hide
AI Engineer
Burlington, Massachusetts, United States
$150k-$180k/yr HybridFull Time
NetBrain
NetBrain: Provides AI-powered no-code network automation and visibility software.
5+ YOE5+ years software engineering; production-grade LLM/RAG systems; strong Python; C/C++ or C#; experience with AI frameworks and evaluation pipelines
Python, C++, C#, LangChain, LangGraph, AutoGen, LlamaIndex, GraphRAG, APIs, Testing
2mo
Save
Mark Applied
Hide
Senior Cloud Developer - Virtualization
Fort Collins or Spring or Andover
$144k-$273k/yr HybridFull Time
Hewlett Packard Enterprise
Hewlett Packard EnterpriseNYSE: HPE: Sells enterprise servers, storage, networking equipment, and cloud services.
7+ YOEBachelor's or master's in computer science/engineering or related field; 7-10 years' experience; strong Python/Java/Golang/JavaScript; microservices/Kubernetes; cloud-native design and development.
Python, Java, Golang, JavaScript, Kubernetes, Docker, Microservices, Cloud, DevOps
2w
Save
Mark Applied
Hide
Test Engineer
Billerica, Massachusetts, United States
$78k-$104k/yr OnsiteFull Time
Teledyne Technologies
Teledyne TechnologiesNYSE: TDY: Manufactures sensors, cameras, and electronics for aerospace and defense.
3+ YOEBachelor’s degree in engineering or related field; 3+ years in test software; experience with LabVIEW/TestStand/C#/SQL/Python; strong problem solving; Git; MES/JIRA/Confluence a plus; export control eligibility.
LabVIEW, TestStand, C#, SQL, Python, Git
1mo
Save
Mark Applied
Hide
AI Engineer (Leawood, KS, US, 66211)
Leawood or Burlington
HybridFull Time
Ascend Learning
Ascend Learning: Provides educational software and certifications for healthcare professionals.
3+ YOE3+ years AI or software engineering; BS in CS/AI/Software Eng or related; Azure AI Engineer cert preferred; Python/REST (FastAPI); ML/LLM experience; distributed systems.
Python, FastAPI, Docker, Kubernetes, CI/CD, Azure, Apache Kafka, Angular, React, REST API
2w
Save
Mark Applied
Hide
Software Design Quality Engineer
Westford, Massachusetts, United States
$61k-$123k/yr OnsiteFull Time
Abbott
AbbottNYSE: ABT: Provides medical devices, diagnostics, and science-based nutritional products.
2+ YOE2-5+ years in software design quality/cybersecurity quality; experience with SDLC, Agile, GMP/21 CFR 820, ISO 62304/13485; Jira/Jama; CS, SWE, or related degree.
Jira, Jama, TestComplete, Coverity, Python, C, C#, Java, Visual Studio
1mo
Save
Mark Applied
Hide
Firmware Engineer lll
Woburn, Massachusetts, United States
OnsiteFull Time
TotalEnergies
TotalEnergiesEuronext Paris: TTE: Produces and markets fuels, natural gas, and low-carbon electricity.
6+ YOEBachelors in Electrical Engineering, Computer Science, or related field; 6+ years firmware/embedded software; US person; experience with C/C++, ARM Cortex-M, microcontrollers; OS-less devices; schematic/PCB reading; debugging with SWD/JTAG; Git; Python.
C, C++, ARM Cortex-M, Microcontrollers, Python, Git, GitHub, FreeRTOS, lwIP, MQTT, Azure, I2C, SPI, DMA, JTAG, SWD, Altium, LTSPICE, Linux
1mo
Save
Mark Applied
Hide
Web Developer
Wilmington or Smithfield
RemoteFull Time
Heilind
Heilind: Distributes interconnect, electromechanical, and sensor products globally.
2+ YOEDesign, code, test, and maintain responsive websites; optimize performance; collaborate with designers and IT team; 2-5 years web development; ITAR US Person.
HTML, CSS, JavaScript, React, Angular, Vue, PHP, Python, Node.js, MySQL, PostgreSQL, Git
3w
Save
Mark Applied
Hide
Product Developer
Burlington, Massachusetts, United States
$127k-$173k/yr HybridFull Time
Signify
SignifyEuronext Amsterdam: LIGHT: Manufactures lighting products and connected IoT lighting systems.
5+ YOEMaster’s degree in Computer Science, Computer Engineering, Information Systems, Information Technology, or related field; 5 years of related experience; strong DevOps in AWS/Aliyun, Kubernetes, Java, Python; CI/CD; cloud security; ability to work in the United States.
AWS, Aliyun, Kubernetes, Java, Python, CI/CD, Cloud Security
2w
Save
Mark Applied
Hide
Research Project Engineer II
Durham, New Hampshire, United States
$55k-$98k/yr OnsiteFull Time
University System of New Hampshire
University System of New Hampshire: Providing public higher education and research through New Hampshire colleges.
2+ YOEBachelor’s degree with 2+ years of experience or equivalent combination; programming experience; strong communication skills; ability to develop and document software systems.
Python, Java, Django, Databases, JavaScript, Cloud Computing, Shell Scripting, CI/CD, GitHub Actions
1d
Save
Mark Applied
Hide
Principal Data Science Engineer - AI/ML & Algorithms
Andover, Massachusetts, United States
$175k-$237k/yr OnsiteFull Time
TransMedics
TransMedicsNASDAQ: TMDX: Preserving and transporting donor organs for medical transplantation.
3+ YOE3+ years ML engineering or data science; 8+ years software development; BS/MS in CS, data science, engineering, or math.
Python, scikit-learn, NumPy, pandas, PyTorch, AWS
5d
Save
Mark Applied
Hide
Senior DevOps Engineer
Danvers, Massachusetts, United States
$91k-$152k/yr HybridFull Time
Johnson & Johnson
Johnson & JohnsonNYSE: JNJ: Develops and manufactures pharmaceutical drugs and medical devices.
5+ YOE5+ years in DevOps; strong CI/CD, infrastructure management, scripting (Python/Bash), and security/compliance; medical device experience preferred.
CI/CD, GitLab, Jenkins, Linux, QNX, Unix, Python, C, Bash
3mo
Save
Mark Applied
Hide
Application Engineer
San Jose or Cary or Austin or Burlington
$74k-$138k/yr OnsiteFull Time
Cadence
CadenceNasdaq: CDNS: Computational software and hardware for semiconductor and system design.
Entry-level engineer program; training in design, verification, HDL, software/hardware co-design; UNIX, C/C++, scripting languages; digital/analog design exposure.
UNIX, C/C++, Perl, TCL, Python, HDL
2mo
Save
Mark Applied
Hide
Senior Cloud Developer - Virtualization
Fort Collins or Spring or Andover
$144k-$273k/yr HybridFull Time
Hewlett Packard Enterprise
Hewlett Packard EnterpriseNYSE: HPE: Provides enterprise computing, storage, networking, and cloud services.
7+ YOEBachelor's or master's in CS/engineering; 7-10 years experience; strong Python/Java/Golang/JavaScript; microservices in Kubernetes; cloud systems design and integration.
Python, Java, Golang, JavaScript, Kubernetes, Microservices
5d
Save
Mark Applied
Hide
Senior DevOps Engineer
Danvers, Massachusetts, United States
$91k-$152k/yr HybridFull Time
Johnson & Johnson
Johnson & JohnsonNYSE: JNJ: Global healthcare developing pharmaceuticals and medical technologies.
5+ YOE5+ years DevOps experience; CI/CD, infrastructure management, scripting; GitLab/Jenkins; Linux; Python/C/Bash; medical device industry preferred.
CI/CD, GitLab, Jenkins, Python, C, Bash, Linux, QNX
1mo
Save
Mark Applied
Hide
Sr. Software/Cloud/Web Application Specialist
Burlington, Massachusetts, United States
$130k-$163k/yr OnsiteFull Time
Glaukos
GlaukosNYSE: GKOS: Develops therapies and devices for treating chronic eye diseases.
8+ YOE8–12+ years in software development with cloud-based app experience; strong cloud architecture knowledge (AWS/Azure/GCP); API design and integration; CI/CD, containerization, DevOps; Bachelor's in CS/SE/IS (Master's preferred); cloud certifications preferred.
AWS, Azure, GCP, Salesforce, JavaScript, TypeScript, React, Angular, Node.js, .NET, Python, CI/CD, Containers, Orchestration, Cloud security
3w
Save
Mark Applied
Hide
Machine Learning Engineer
Manchester, New Hampshire, United States
OnsiteFull Time
DEKA Research & Development
DEKA Research & Development: Designs and develops advanced medical and robotic technologies.
6+ YOEMS in CS or AI; 6+ years backend and distributed systems; strong Java/Python; production ML models; Kafka/Spark; microservices; databases; AWS.
Java, Python, Spring Framework, Hibernate, PyTorch, Kafka, Spark, ZooKeeper, AWS, REST APIs, NoSQL databases, SQL databases
2w
Save
Mark Applied
Hide
AI/ML Development Senior Engineer
Durham or Lowell or Morgan Hill
OnsiteFull Time
MACOM
MACOMNASDAQ: MTSI: Designs and manufactures semiconductor products for communications infrastructure.
5+ YOEBachelor’s or Master’s in CS/AI/DS; 5-10 years AI/ML engineering; Python and ML frameworks; agentic AI; cloud-based architectures; collaboration across teams.
Python, Pandas, PyTorch, TensorFlow, LangChain, OpenAI, Anthropic, AWS Bedrock, SageMaker, Hugging Face
1w
Save
Mark Applied
Hide
Firmware Engineer Co-Op
Andover, Massachusetts, United States
$22-$27/hr OnsiteAll Commitments Available
Schneider Electric
Schneider ElectricEuronext Paris: SU: Global provider of energy management and industrial automation solutions.
Pursuing degree in Computer Science, Electrical Engineering, Electronics or related field; C/C++ and Python; Git; Linux; Agile concepts; embedded systems knowledge; good communication.
C, C++, Python, Git, Linux, Agile, Embedded Systems
1w
Save
Mark Applied
Hide
Machine Learning Engineer - Edge
Dover or Lowell
$86k-$135k/yr HybridFull Time
GN Store Nord
GN Store NordNasdaq Copenhagen: GN: Develops intelligent hearing, audio, and video technology solutions.
2+ YOE2+ years in ML for edge devices; C/C++, Python; TensorFlow Lite or PyTorch; embedded systems; audio/speech processing; model compression; cross‑functional collaboration.
C, C++, Python, TensorFlow Lite, PyTorch, Embedded systems
4w
Save
Mark Applied
Hide
Senior Robotics Motion Planning Engineer
Woburn, Massachusetts, United States
OnsiteFull Time
Automated Tire
Automated Tire: Builds robotic systems for automated tire and wheel service.
2+ YOEExpert in motion planning (RRT, RRT*, PRM, CHOMP/STOMP, TrajOpt) with 2+ years MoveIt/MoveIt 2 in production; strong ROS2/C++/Python; experience with collision avoidance, kinematics, and real-time systems.
ROS 2, MoveIt, OMPL, CHOMP, STOMP, Pilz, URDF, SRDF, KDL, TRAC-IK, C++, Python, OctoMap, PCL, Open3D, real-time systems
2mo
Save
Mark Applied
Hide
Senior Machine Learning Engineer (3968)
Manchester, New Hampshire, United States
HybridFull Time
GBG
GBGLondon Stock Exchange: GBG: Provides global identity verification and fraud prevention technology solutions.
Lead development and deployment of ML/CV models in production; mentor engineers; work in an Agile team.
Python, PyTorch, OpenCV, C++, TensorFlow
1mo
Save
Mark Applied
Hide
Solutions Engineer/Technical Lead, Software (Guidewire Policy Center)
Plano or Columbus or Boston or Portsmouth or Indianapolis
HybridFull Time
Liberty Mutual
Liberty Mutual: Provider of global property and casualty insurance products.
10+ YOEStrong software integration expertise with Guidewire, GWCP, API-first design, Java/Spring, cloud and DevOps, and experience with Guidewire InsuranceSuite.
Java, Spring Boot, JavaScript, TypeScript, Node.js, Python, AWS, Kubernetes, Docker, PostgreSQL, NoSQL, Jenkins, GitLab CI, AWS CodePipeline, TeamCity, Cloud Foundry, APIs, GWCP, IG
2mo
Save
Mark Applied
Hide
Software Engineering & Development, VP
Clifton or Boston or Quincy or Burlington
$135k-$218k/yr OnsiteFull Time
State Street
State StreetNYSE: STT: Providing investment management and asset servicing to institutional investors.
12+ YOESenior data engineer with 12+ years, Spark/PySpark/Scala, AWS, Databricks, ETL/ELT, CI/CD, Terraform/CloudFormation, data governance.
Python, Scala, PySpark, SQL, Terraform, CloudFormation, Databricks, Spark, Hadoop, Hive, AWS, S3, Glue, Lambda, EMR, Redshift, Athena, Kinesis, Delta Lake, Unity Catalog, Databricks Workflows, Git, CI/CD, DevOps
1w
Save
Mark Applied
Hide
Senior Build & Release Engineer
Andover, Massachusetts, United States
$131k-$152k/yr OnsiteFull Time
Rockstar Games
Rockstar Games: Creates and publishes world-class open-world video games.
5+ YOE5+ years in configuration management/engineering for web apps; CI/CD experience; OOP programming; scripting; distributed systems; multi-platform release; containerization; source control; bug-tracking.
TeamCity, Jenkins, GitHub, Perforce, Docker, PowerShell, Bash, Python, C#, Java
2w
Save
Mark Applied
Hide
Director of Software Engineering
Wilmington, Massachusetts, United States
$190k-$220k/yr OnsiteFull Time
Goddard
Goddard: Engineering and industrial design firm for medical and robotic products
10+ YOE10+ years embedded software development; 5+ years Medical Device experience; strong C/C++, Python; experience with GCC, CMake, Git; Linux scripting; BLE, Wi-Fi, RTOS; firmware and hardware coupling.
C, C++, Python, GCC, CMake, Git, Linux, BLE, WiFi, RTOS, Scripting, CAN, RS232, I2C, SPI, UDP, TCP/IP
6d
Save
Mark Applied
Hide
DevOps Engineer
White Plains or Conyers or Roanoke or Independence or Hartford or Savannah or Alexandria or Greensboro or Charleston or Missoula or Charlotte or Huntsville or Hartford or Miami or Tallahassee or Albany or Gainesville or Columbus or Boston or San Antonio or Dallas or Denver or Phoenix or San Francisco or Chicago or Nashville or Portland or Charlotte or Houston or Wilmington or Lexington or Tampa or Baltimore or Raleigh or Las Vegas or Cary or Irvine or Brookfield or Shreveport or Greenville or Van Nuys or Minneapolis or Red Bank or Jacksonville or Seattle or Sarasota or Kennesaw or Palm Beach or Towson or Sacramento or Dayton or Broomfield or Golden or Princeton or Omaha or Oklahoma City or Chesterfield or Schaumburg or Suffolk or Jupiter or Carmel or Canonsburg or Buffalo or Schaumburg or Philadelphia or Schaumburg or Sunrise or St. Louis or Los Angeles or Atlanta or Gulfport or Norwalk or South Portland or Metairie or Virginia Beach or Edina or Richmond or Southfield or Cleveland or Milwaukee or Chattanooga or Fort Worth or Rochester or Grand Forks or Detroit or Jersey City or Boise or Portland or San Ramon or Easley or Duluth or Glenville or Syracuse or West Palm Beach or Cary or Irvine or Brookfield or Shreveport or Greenville or Los Angeles or Atlanta or Orland Park or Columbia or Elmhurst or Portland or San Diego or San Ramon or Myrtle Beach or Gainesville or Hartford or Allentown or Macon or Tampa or Saint Petersburg or Irvine or Raleigh or San Ramon or Lewisville
$77k-$134k/yr RemoteFull Time
Marsh McLennan
Marsh McLennanNYSE: MRSH: Global professional services firm providing risk, strategy, and people solutions.
5+ YOE5+ years software development; cloud (Azure/AWS); CI/CD (Azure DevOps, GitHub Actions); scripting (Python, Bash, PowerShell); Git; strong communication; delivery track record.
Azure, AWS, Terraform, Azure Bicep, Docker, Kubernetes, Git, Azure DevOps, GitHub Actions, Python, Bash, PowerShell
2mo
Save
Mark Applied
Hide
Software / Computer / Robotics Engineer – PLC & Control Systems, Ocean Products
Chelmsford, Massachusetts, United States
$75k-$115k/yr OnsiteFull Time
Triton Systems
Triton Systems: Develops and commercializes advanced technologies for defense and commercial markets.
2+ YOEBachelor's degree in CS/CE/Robotics; 2+ years; PLC/HMI/VFD; control systems; hardware interfacing; prototyping; strong communication.
PLC programming, HMI programming, VFD programming, MATLAB, LabVIEW, Wago controllers, C/C++, Python, TCP/IP networking, DAQ, signal conditioning
1mo
Save
Mark Applied
Hide
Engineer IT Applications
South Portland, Maine, United States
OnsiteFull Time
Diodes Incorporated
Diodes IncorporatedNasdaq: DIOD: Global manufacturer of discrete, logic, and analog semiconductor components
2+ YOE2+ years CIM software development in manufacturing; BS in CS/EE/Control Systems or related; Python/Tcl/Tk; on-site full-time.
Python, Tcl/Tk, PostgreSQL, JavaScript, COBOL, OpenVMS, Linux, Windows, Azure DevOps, ISO27001
2mo
Save
Mark Applied
Hide
System Integration Engineer
Nashua, New Hampshire, United States
HybridFull Time
Parallel Wireless
Parallel Wireless: Develops cloud-native Open RAN software for cellular mobile networks.
2+ YOE2+ years in system integration of LTE or 5G radio access solutions; real-time software development; Python; Matlab; radio test equipment; strong teamwork and problem-solving skills.
Python, Matlab, Radio test equipment
1mo
Save
Mark Applied
Hide
Senior Systems Engineer
Mukilteo or Sunnyvale or Nashua
OnsiteFull Time
Pacific Defense
Pacific Defense: Designs and manufactures modular electronic warfare and C5ISR systems.
Extensive experience with military waveforms, RF design, embedded software, HDL, C/C++, Python; IP networks; DoD process; leadership.
C, C++, Python, VHDL, Verilog, ARM, Xilinx MPSoC, embedded Linux, IPMI, Redfish, Cameo/MagicDraw

HiringCafe market data

Python Software Developer Jobs market signals in Kittery, ME, US

These signals come from live HiringCafe job inventory, not a static article. Use them to compare the market, then open listings above to apply directly.

Open jobs
290+
Hiring companies
77
Fresh sample
42% new in 30d
Salary visibility
64% show pay

Companies appearing in this market

Hewlett Packard EnterpriseFidelity InvestmentsJohnson & JohnsonAnalogicRockstar GamesState StreetBroadcomCisco

Work location mix in visible results

Onsite: 39Hybrid: 24Remote: 3