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Controls Software Engineer - Structured Text

Industrial Robotics Program | Contract Engagement | Seattle, WA or Boston, MA (On-Site) | Immediate Start

About the Opportunity

We are hiring a Controls Software Engineer to join a high-impact engineering team supporting a large-scale industrial robotics program at one of the world's leading e-commerce and logistics companies. The program operates a fleet of over 1,000 robotic pick-and-place workcells across global fulfillment centers today, scaling to 5,000-6,000 machines by 2027.

This is a hands-on, technically deep contract engagement with strong likelihood of extension. You will work inside a small, tight-knit team of controls and software engineers responsible for keeping the deployed fleet running reliably and improving its performance at scale.

The Program

The product is a Transfer Cartesian Cell (TCC) - an 8-axis, servo-driven Cartesian pick-and-place robotic workcell. It integrates with mobile floor robots inside fulfillment centers: the floor robots deliver pods of totes to the cell, and the TCC reaches in, retrieves the totes, and places them onto conveyance systems for downstream handling.

The deployed fleet runs on an IEC 61131-3 control platform on Linux-based industrial PCs. The architecture is mature - this is not greenfield development. Your focus is hardening the deployed fleet, reducing faults, and closing performance gaps while a parallel next-generation platform is developed alongside.

What You'll Be DoingSustainment and Fault Reduction (80-90% of the work)Investigate and resolve bugs and faults in the deployed control application running across 1,000+ machines in the fieldDiagnose issues using machine telemetry, logs, alarm history, and operational data; drive fixes from root cause through deploymentSome fixes require feature-level rework - rethinking modules to remove complexity and improve reliability rather than patchingRate, Throughput, and PerformanceAddress rate gaps and workcell throughput shortfalls - the team is currently behind aggressive performance targets, so your impact is visible quicklyWork across the servo control layer, motion orchestration, and state handling to close performance gapsIntroduce targeted improvements that make the machines faster and more reliable at fleet scaleLab and Hardware TestingWrite, test, and validate control code on physical test machines located on-siteWork hands-on with real hardware - servos, drives, sensors, vision systems, and conveyance componentsDefine test cases and provide QA context for downstream validationDocumentation and Change ManagementAuthor Management of Change Memos (MCMs) detailing each change going to the fieldDrive stakeholder alignment and approval across deployment, operations, hardware, and field support before changes ship fleet-wideCreate runbooks, troubleshooting guides, and hardware failure documentationWhat We're Looking ForMust-HavesStrong IEC 61131-3 Structured Text development experience - this is the core requirementReal controls / PLC software development backgroundAbility to independently own tasks, execute, and deliverHands-on experience with industrial hardware - servos, drives, sensors, motion systemsWillingness to work on-site in Seattle or BostonStrongly PreferredTwinCAT experience - aligns directly with the platform and ways of workingCODESYS experience - ideal, though not requiredServo control, motion, Cartesian, or pick-and-place workcell backgroundEtherCAT or industrial fieldbus depthExperience supporting fleet-scale or production systems, not just single-machine commissioningStrong technical writing - runbooks, change memos, troubleshooting guidesNot a FitLadder-logic-only backgrounds without Structured TextCandidates unable to work on-site in Seattle or BostonExperience Level

We are open to a range of experience levels. Mid-level engineers with 3-5 years are welcome provided they can own tasks and deliver independently. Senior engineers who can plug in immediately are equally welcome. What matters is demonstrated Structured Text capability and the ability to execute.

Location and On-Site Requirement

This role is on-site in Seattle, WA or Boston, MA. Test hardware lives in the lab and close collaboration with the team is essential, particularly in the first few months. For candidates committed to relocating, a short-term arrangement (e.g., weekly travel for the first ~2 months while relocation is completed) can be documented as part of the contract.

Engagement Details

Location: Seattle, WA or Boston, MA - on-site

Contract: Milestone-based contract engagement with strong likelihood of extension

Start: As soon as possible - interviews happening now

Hours: Full-time

How to Apply

Send your resume with a brief note covering your Structured Text experience (and the platforms you've used it on - CODESYS, TwinCAT, Allen-Bradley, Siemens, etc.), the types of machines and systems you've programmed, and your willingness to work on-site in Seattle or Boston. We're moving quickly - candidates who can demonstrate real Structured Text depth will be prioritized.

GCS is acting as an Employment Business in relation to this vacancy.

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Role: Network Design Engineer


Position Overview

We are seeking an experienced Design Engineer III to support carrier-grade Ethernet and metro network services within a large telecom environment. This is a highly technical network design role focused on designing commercial Ethernet services for enterprise customers across West Division markets.

The ideal candidate will have strong experience with:

Carrier Ethernet / Metro Ethernet servicesLayer 2 and Layer 3 telecom networkingFiber transport technologiesTelecom network design and service deliveryCarrier-grade routing and switching environments

This is not an enterprise IT/network administrator role. Candidates must come from a telecom, carrier, ISP, or service provider background rather than campus or internal corporate IT networking.

Key Responsibilities

Network & Service Design

Design carrier-grade Ethernet services for enterprise customersCreate network/service designs for:Metro EthernetCarrier EthernetEPL (Ethernet Private Line)EVPL (Ethernet Virtual Private Line)ELAN / Ethernet Network ServicesInternet-based Ethernet servicesProduce detailed Visio network diagrams and service designsInterpret fiber survey data and determine service delivery pathsDesign customer connectivity based on serving headends and network infrastructure

Fiber & Transport Engineering

Read and interpret fiber survey documentationUnderstand:Splice pointsFiber pathsOptical loss budgetsDistance limitationsFiber plant infrastructureWork with:Single-mode fiberMulti-mode fiberDWDM transport technologies

Routing & Switching Technologies

Work with carrier-grade networking technologies including:

Layer 2 Ethernet switchingLayer 3 routingCarrier transport technologies

Preferred vendor experience includes:

Ciena switchesCisco routersNokia routers

Operational Support

Manage and prioritize work queues assigned by regionSupport customer service delivery requests and escalationsParticipate in meetings with project managers and engineering teamsRespond promptly to emails, IMs, and operational requestsWork in a fast-paced, task-driven environment

Day-to-Day Responsibilities

Review assigned service design requests in operational queuesDesign Ethernet services for customer sitesBuild Visio diagrams for service deliveryAnalyze fiber survey informationCoordinate with internal engineering and project teamsPrioritize urgent customer requests and escalationsComplete approximately 15 design tasks per day once fully ramped up

Required Qualifications

Experience

7-10+ years of telecom/network engineering experienceExperience in carrier-grade or service provider networking environmentsStrong background in Metro Ethernet / Carrier Ethernet technologies

Technical Skills

Strong understanding of:

Layer 2 Ethernet technologiesCarrier Ethernet servicesFiber optics and transport networksDWDM technologiesFiber plant infrastructureOptical loss calculationsRouting and switching concepts

Experience with:

EPLEVPLELANMetro Ethernet services

Networking Hardware

Hands-on or design-level familiarity with:

Ciena switchesCisco routersNokia routers

Tools

Required:

Microsoft Visio

Nice to Have:

GIS/fiber design toolsTelecom network inventory systems

Soft Skills

Strong organizational and prioritization skillsAbility to manage multiple work queues and shifting prioritiesHighly responsive communication styleComfortable working independently in a fully remote environmentAbility to adapt quickly to escalations and changing priorities

Preferred Backgrounds

Candidates with experience in:

Telecom carriersISPsMetro Ethernet providersService provider networkingFiber network designCarrier transport engineering

Titles that may align well:

Carrier Ethernet EngineerFiber Design EngineerTelecom Network EngineerMetro Ethernet EngineerNetwork Design EngineerTransport Network Engineer

Additional Information

Fully remote positionNo travel requiredLong-term ongoing project workPotential for contract extension and future conversion based on performance and business approval

GCS is acting as an Employment Business in relation to this vacancy.

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Job Title: Fiber Engineer

Overview

We are seeking a Fiber Engineer to support Fiber optic network deployment projects across multiple regions. This role is heavily focused on ISP Fiber testing and quality assurance, involving hands-on fieldwork, frequent travel within Texas and across the united states, and direct interaction with installed fiber infrastructure. The position is well suited to both early‑career and developing engineers with a strong desire to learn and grow within telecommunications.

Key Responsibilities

Travel weekly to assigned project sites within a regional territory Perform fiber optic testing on newly installed and existing networks Conduct OTDR testing and trace analysis to identify faults, signal loss, or performance issues Validate fiber network performance against project specifications and quality standards Support primarily OSP and ISP  activities, including network verification and handover Assist with cable entry into buildings and termination at internal termination panels Interpret field data, diagrams, and technical documentation Accurately document test results and maintain QA and project records Communicate findings clearly with internal teams and stakeholders

Technical Focus Areas

Fiber Optics

Hands-on involvement with fiber optic infrastructure and testing Understanding of fiber routes, termination points, and network performance criteria Familiarity with fiber components such as ducts, panels, and enclosures Fiber splicing experience is a plus

OSP / ISP

Majority of work is ISP and OSP -focused mainly around building entry and termination Strong understanding of the OSP-ISP interface and handover points

GIS

Exposure to GIS mapping systems for reviewing cable routes and asset locations Ability to interpret GIS data to support testing and fault identification Use of GIS tools to verify network layouts and site information

Required Skills & Experience

Basic knowledge of fiber optics or cabling systems Interest in or exposure to fiber testing, particularly OTDR (hands-on experience preferred but not essential) Comfortable working with technical documentation, standards, and procedures Strong problem‑solving and analytical skills Clear and professional communication skills Willingness to travel extensively on a weekly basis Strong work ethic and eagerness to learn

GCS is acting as an Employment Business in relation to this vacancy.

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The OMHS Automation Integration Technologies (AIT) team is building a greenfield, standardized conveyance control platform for next‑generation fulfillment centers. This role focuses on developing production‑ready CODESYS control software deployed at scale across large material‑handling facilities, using Linux‑based IPCs and EtherCAT.

This is a hands‑on controls software role, contributing directly to a new, modular automation architecture rather than retrofitting legacy systems.

Key Responsibilities

Develop modular CODESYS control software using IEC 61131‑3 (Structured Text & Function Blocks)Build reusable device abstraction libraries ("Lego Blocks") for motors, drives, sensors, actuators, and I/OAssemble control area applications ("Lego Sets") for conveyance units such as merges, diverts, and sortation zonesPerform lab‑based integration, testing, and hardening of control logicPartner with assigned control‑area leads to deliver scalable, layered control solutionsProduce clear documentation, runbooks, and support initial on‑site commissioning and deployments

Required Skills & Experience

Hands‑on CODESYS development (mandatory; TwinCAT / Beckhoff variants not accepted)Strong proficiency in IEC 61131‑3 Structured Text and Function Block programmingObject‑oriented and modular design within CODESYSExperience in material handling, conveyance, sortation, or industrial automation systemsFieldbus experience: EtherCAT (primary); EtherNet/IP or Profinet a plusPLC/IPC‑based controls design and industrial device integrationFamiliarity with Linux‑based industrial PCsSoftware engineering discipline: Git, version control, code reviews, structured testingExperience with layered (non‑monolithic) control architectures

GCS is acting as an Employment Business in relation to this vacancy.

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C++ Embedded Software Engineer

Industrial Robotics Platform Migration | Contract Engagement | Boston, MA / Seattle WA (Hybrid - 3 days/week on-site minimum) | Immediate Start

About the Opportunity

We are hiring a C++ Embedded Software Engineer to join the next-generation platform team at one of the world's leading e-commerce and logistics companies. The role is part of a strategic effort to rewrite a mature industrial control application from a legacy controls platform into a modern, scalable C++ stack - supporting the scaling of an industrial robotic workcell fleet from approximately 1,000 deployed machines today to 5,000-6,000 machines by 2027.

This is a contract engagement with strong likelihood of extension. You'll be working alongside an existing team of engineers driving the migration, with day-to-day technical autonomy and direct impact on the architecture that will run thousands of machines globally.

Program Context

The product is a Transfer Cartesian Cell (TCC) - an 8-axis, servo-driven Cartesian pick-and-place workcell that integrates with mobile floor robots inside fulfillment centers. The machines retrieve totes from mobile robot pods and place them onto conveyance systems for downstream handling.

The current control application runs on CODESYS - an IEC 61131-3 industrial controls platform - within an industrial PC (IPC) ecosystem on Linux. The existing architecture works, but doesn't scale cleanly to the next deployment volume. The team is rewriting the application in C++ on a new internal platform that replaces the legacy Sprocket infrastructure with a modern, more general-purpose software stack.

Your role is on the C++ migration side - building the new application that will eventually replace CODESYS as the production control layer.

What You'll Be DoingC++ Application DevelopmentBuild the new C++ control application that will replace the legacy CODESYS implementationDevelop embedded software running on Linux-based industrial PCs in production fulfillment environmentsDesign modular, testable, scalable software with proper unit-test coverage - solving the scaling problem that the legacy platform couldn'tImplement control logic, motion orchestration, device interfaces, and system-level behaviorMigration from CODESYSRead and interpret the existing CODESYS application as the source of truth for the rewriteEnsure functional parity between legacy CODESYS behavior and the new C++ implementationDebug migration issues that require understanding both the legacy and new stacksTesting, Hardening, and DeploymentBuild automated test infrastructure to validate behavior at scale - a key motivation for the migrationTest on real hardware in the Boston lab - servos, drives, sensors, motion componentsHarden the codebase through iterative testing, code reviews, and production-readiness validationSupport initial deployments and validate behavior in field conditionsCross-Team CollaborationCoordinate with the CODESYS sustainment team to align on what features and behaviors must be preservedEngineers may flex between the migration team and the CODESYS sustainment team based on workload - versatility is valuableWork with hardware, deployment, and operations stakeholders to ensure the new platform meets production requirementsRequired Skills and ExperienceStrong C++ embedded development experience - real-time, embedded, or industrial control environmentsHands-on Linux experience - system-level work, debugging, deployment, embedded LinuxSoftware engineering discipline - Git, code reviews, structured unit testing, CI/CDComfortable working with real hardware in a lab - servos, drives, sensors, fieldbus, motion systemsStrong debugging skills across embedded, application, and system layersAbility to read and interpret legacy code in unfamiliar languages or platforms - willingness to engage with CODESYS code as a referenceWillingness to work from the Boston office a minimum of 3 days per week - non-negotiableStrongly PreferredDirect CODESYS exposure or work with IEC 61131-3 platforms - even basic familiarity is a significant plusIndustrial controls or robotics backgroundEtherCAT, MQTT, or industrial fieldbus protocol experienceOTA / firmware update workflows; Yocto, BitBake, or similar embedded build systemsExperience migrating legacy systems to modern software stacksPython or scripting for test automation, tooling, and diagnosticsPrior work in motion control, servo systems, or multi-axis machine controlPrior Amazon Robotics or fulfillment center automation exposureThe Unicorn Profile

The ideal candidate has both strong C++ embedded experience and meaningful CODESYS exposure. If you have both, you'll be a top candidate for the role and a critical bridge between the legacy and new stacks. If you have strong C++ and only light CODESYS context, you're still very much in the conversation - willingness to engage with CODESYS as a reference language is what matters.

Engagement Details

Location: Boston, MA / Seattle WA- hybrid, minimum 3 days per week on-site

Start: As soon as possible - phone screens happening now

Hours: Full-time; 40 hours/week

Who Thrives in This Role

You're a strong C++ engineer who's comfortable in embedded and Linux environments and excited about building software that runs real industrial hardware. You like working at the intersection of software engineering and physical machines. You're willing to learn from a legacy controls platform to inform a clean rewrite. You value bias for action - the team is looking for engineers who can move fast and deliver, not engineers who get bogged down in process. The fresh perspective you bring as an outside hire is genuinely valued by leadership.

GCS is acting as an Employment Business in relation to this vacancy.

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Job Title - Senior CODESYS Controls Engineer - Material Handling Systems

Amazon OMHS (One Material Handling System)
Location: Seattle/Bellevue, WA (Hybrid preferred) | Remote (US-based) with travel

Project:

Amazon's One Material Handling System (OMHS) organization is building a new, standardized conveyance controls platform for fulfillment centers worldwide. This is a greenfield product development effort, not a retrofit of existing systems.

You will join the Automation Integration Technologies (AIT) team, responsible for developing the controls software stack that will be deployed at scale across Amazon's global fulfillment network.

Technology Stack CODESYS on Linux | Advantech Industrial PCs | EtherCAT (primary fieldbus)

Role Overview

Develop CODESYS-based machine control logic on Linux industrial PCsBuild standardized device abstraction layers for motors, drives, sensors, actuators, and I/OAssemble reusable control components for conveyors, merges, diverts, and sortation systemsPerform lab-based hardware integration and controls validation in the Bellevue, WA labMature software from prototype through production releaseCreate technical documentation, runbooks, and handoff materialsProvide engineering support for the first 1-2 deployments, then transition to deployment teams

Required Skills & Experience

5+ years of hands-on CODESYS development (mandatory)Strong IEC 61131-3 Structured Text and Function Block programmingExperience with modular, layered PLC/controls architecturesBackground in industrial automation (material handling, conveyance, sortation, manufacturing)Hands-on integration of motors, drives, sensors, actuators, and I/OFieldbus experience: EtherCAT (primary), EtherNet/IP, ProfinetFamiliarity with Linux-based industrial PCsSoftware development discipline: Git, version control, code reviews, structured testing

Important:
TwinCAT / Beckhoff-only experience will not be considered. This role requires direct CODESYS expertise.

Work Model & Travel Expectations

Hybrid work preferred for candidates based in the Seattle/Bellevue area, with regular lab presenceRemote US-based candidates are accepted due to CODESYS skill scarcityPeriodic travel is required for lab-based integration testing and early deploymentsOnsite support is required for the first 1-2 deployments of each new control areaTravel is planned in advance and fully covered

This role is well-suited for engineers who enjoy building product-quality controls software, working within a defined architecture, and contributing to a platform deployed at global scale.

GCS is acting as an Employment Business in relation to this vacancy.

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