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Senior Integration Engineer - Critical Infrastructure & OTOKTO Integrated Services • London, England, United Kingdom
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Senior Integration Engineer - Critical Infrastructure & OT

OKTO Integrated Services
  • GB
    London, England, United Kingdom
  • GB
    London, England, United Kingdom
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À propos

*Senior Integration Engineer — Critical Infrastructure & OT*
*Location:* Based in either London or Lisburn. Project-based travel between the two — typically a few days at a time, not long-term relocation. UK-wide and occasional European travel on live projects.
*Engagement*: 12-month initial contract, renewable. B2B, weekly GBP, outside IR35.
*Day rate*: £700 – £750 per day, benchmarked deliberately above market. Travel, accommodation and subsistence covered on site-based work.
*About OKTO:*
OKTO Integrated Services has spent 33 years delivering complex multi-system integration on projects where the technology has to be invisible and the user experience uncompromising — luxury hospitality (Hilton Waldorf Astoria at Admiralty Arch, The Peninsula London), superprime residential (Mayfair Park Residences, 80 Holland Park, Forbes House) and high-profile corporate clients (Manchester United, Allstate). We are now extending this discipline into critical infrastructure, and building the CIDE-OS platform (Critical Infrastructure Digital Estate Operating System) that turns raw building data into operational intelligence. This role is part of that direction of travel.
*The role: *
This is an OT integration role at the critical-infrastructure end of OKTO's work. The systems we deliver have to stay up — flagship hospitality, superprime residential, complex corporate environments, and increasingly regulated digital-estate work — and the engineer in this seat is the person who makes the operational technology underneath them reliable, integrated and observable.
Integration is the discipline. You are the engineer who makes disparate mechanical and electrical systems talk to each other reliably — SCADA head-ends, generators, UPS, power distribution, HVAC plant, lighting, AV, security, metering, life safety, hotel PMS — across whatever protocol stack each vendor decided to use. You build the integration architecture, choose the broker and middleware patterns, write the code, and commission it end-to-end. MQTT, BACnet/IP, Modbus, OPC UA, KNX, REST and GraphQL are the everyday vocabulary.
BMS sits inside this — we do significant BMS work, and you will deliver on Schneider EcoStruxure Building Operation, Niagara N4, WAGO/CODESYS, KNX and GRMS platforms where projects call for it. But this is not a BMS role with extra responsibilities tacked on. It is an OT and critical-infrastructure role where BMS is one of several systems you integrate.
You will also work alongside our platform team to surface field-layer data into the Operational Intelligence Layer of CIDE-OS, using Brick Schema, semantic tagging, Azure Data Explorer and Grafana. The work is no longer just “make the system run” — it is “make the system run, make everything around it talk to it, and make the estate knowable”.
This is not a single-product role and it is not a single-project role. You will rotate across our active pipeline: flagship hospitality conversions (including the Hilton Waldorf Astoria atAdmiralty Arch), superprime residential, large-format BMS and controls retrofits, regulated digital-estate work, and complex corporate environments. The common thread is technical complexity — we are brought in for the work others find too difficult.
*What you will do: *
*Integration & middleware: *
* *Own the integration architecture *across each project — choosing broker, middleware and gateway patterns; deciding what runs at the edge, what runs centrally and what runs in the cloud; defining how systems fail over.
* *Build and run MQTT brokers* for building-scale telemetry — topic hierarchy, QoS levels, retained messages, persistent sessions, TLS, ACLs and bridging to the platform layer. We use MQTT seriously, not as a buzzword.
* *Build API-led integrations *where MQTT is not the right tool — REST and GraphQL middleware, webhooks, scheduled pollers and bespoke connectors. The right pattern for the right job.
* *Bridge legacy and modern stacks* — pulling BACnet/IP, Modbus TCP/RTU and KNX into MQTT and API surfaces without losing fidelity, semantics or latency tolerance.
* *Define point and topic naming conventions *that survive twenty years of facilities turnover. The point names you choose today will be the column headers on someone's dashboard in 2046.
* *Stand up integration test harnesses* — simulators, fault injection, end-to-end soak tests. Integration that has not been deliberately broken in test will break in production.
* *Build bespoke integration platforms w*here the project demands it — MQTT brokers, REST/GraphQL APIs, custom middleware, and integration dashboards built specifically for the estate rather than bought off the shelf.
*SCADA & critical power: *
* *Build SCADA and HMI head-ends* for plant monitoring and critical power estates — data modelling, alarm hierarchies, trends, diagnostics and operator visualisation.
* *Integrate standby generators *into the monitoring stack — start/stop status, fuel levels, run hours, fault codes, AMF panels, and generator control panels from Deep Sea, ComAp, Woodward and equivalents over Modbus or J1939.
* *Integrate UPS systems* — APC, Eaton, Riello, Vertiv, Socomec — for battery health, load, runtime, bypass status and predictive alarming. Critical loads do not get to fail quietly.
* *Wire power metering and energy data *into the platform — three-phase quality, harmonics, sub-metering for tenant billing, PUE inputs where the project demands it — across Modbus and BACnet.
* *Engineer alarming that earns its keep* — alarm storms suppressed, root-cause hierarchies surfaced, the 3am call routed to the right person with the right context. Operators trust SCADA that does not cry wolf.
*Network & IT infrastructure: *
* *Build and deploy building networks* to OT-grade standards — IP addressing schemes, VLAN segmentation, switch configuration and wireless sensor integration.
* *Navigate enterprise IT* alongside the client's IT team — firewall rules, port allocations, certificate handling, and secure OT/IT segregation.
* *Manage device discovery and onboarding* for wireless sensors, IP-connected controllers, edge gateways and any cloud-bound telemetry.
* *Treat cybersecurity as a first-class concern *— hardening defaults, secrets handling, least-privilege access and audit logging across the OT stack.
*BMS, KNX & building controls:*
* *Deliver BMS work end-to-end* where projects call for it — on Schneider EcoStruxure Building Operation, Niagara N4 (Tridium), WAGO/CODESYS and Crestron — from architecture through programming, commissioning and handover.
* *Build and program GRMS solutions *for hospitality clients — room logic, occupancy, lighting scenes, HVAC setpoints, do-not-disturb / make-up-room workflows and PMS integration.
* *Deliver KNX programming* in ETS6 — group addressing, scene logic, DALI-2 broadcast and addressable control, and Schneider SpaceLYnk Lua scripting on the larger jobs.
* *Build distributed control architectures *for commercial, hospitality and heritage-grade sites — typically 20–40+ controllers per project.
* *Program PLC controllers* in Structured Text (IEC 61131-3) using CODESYS 3.5 (WAGO) and/or TwinCAT 3, with reusable modular function blocks.
* *Integrate multi-system mechanical and electrical environments *— HVAC (FCU, AHU, VRF with PID control), lighting, power distribution, energy metering, security and life-safety — using Modbus TCP/RTU, BACnet/IP, KNX, DALI-2, M-Bus, OPC UA, DMX, SMI and MQTT.
* *Commission on-site* — factory acceptance, point-to-point, sequence verification, integrated systems testing and witnessed handover.
*Digital & data layer:*
* *Apply Brick Schema* (and equivalent ontologies) to the sites you commission — class hierarchies, relationships, point types, equipment groupings. Make the estate queryable, not just controllable.
* *Establish naming and tagging conventions *that the platform team can build against — point names that mean something in five years, equipment IDs that survive a refit, metadata that does not have to be reverse-engineered from a drawing.
* *Work alongside the CIDE-OS platform team* to surface field-layer data into the Operational Intelligence Layer — telemetry into Azure Data Explorer, semantic mapping into the digital twin, dashboards in Grafana.
* *Configure independent data layers *(Mapped's Universal Gateway and equivalents) where the project demands a vendor-independent view of the estate.
* *Champion digital-twin discipline on site* — the as-built model is the digital twin's starting point. If you record it sloppily, the twin will be sloppy. We do not work like that.
* *Document properly *— electrical schematics in AutoCAD/EPLAN, software architecture, I/O schedules, semantic data models and as-built records the next engineer (or the platform team, or an LLM) can pick up cleanly.
*What you will bring:*
*Essential: *
* Proven track record as an integrator on critical-infrastructure or OT projects — building and delivering multi-vendor, multi-protocol integrations end to end.
* Deep practical experience with MQTT — broker selection and deployment, topic structure, QoS, security and bridging — not just “I have heard of it”.
* SCADA development experience to a serious standard — data modelling, alarm engineering, trends and operator HMIs (AVEVA System Platform / Wonderware, Ignition, Niagara N4, EcoStruxure, ASIX or comparable).
* Experience integrating standby generators and UPS systems into monitoring stacks — Deep Sea / ComAp / Woodward gensets and APC / Eaton / Riello / Vertiv UPS, over Modbus, BACnet or SNMP.
* Critical power monitoring on data centre, hospital or pharma sites — PUE reporting, redundancy schemes, AMF / ATS panels.
* Practical experience with enterprise IT alongside OT — IP addressing, VLANs, firewall traversal, certificate handling and secure OT/IT segregation.
* Working knowledge of at least five of: MQTT, Modbus TCP/RTU, BACnet/IP, OPC UA, KNX, DALI/DALI-2, M-Bus, DMX, SMI, SNMP, J1939.
* Practical experience with API-led integration — REST, GraphQL, webhooks, middleware.
* Experience building bespoke integration platforms — MQTT brokers, REST/GraphQL APIs, custom middleware.
* Strong hands-on programming in Structured Text (IEC 61131-3) on CODESYS 3.5, TwinCAT, or equivalent. Working fluency in Python or C# for scripting and tooling.
* Hands-on experience with at least one major BMS platform — Schneider EcoStruxure Building Operation, Niagara N4 (Tridium), Trend, Distech or comparable. Experience building and commissioning distributed architectures (multi-controller, multi-protocol).
* Experience integrating mechanical and electrical plant — HVAC (AHU, FCU, VRF) with PID control loops, lighting, power distribution and metering.
* Working knowledge of modern smart-building data architectures — Brick Schema or equivalent ontology, semantic tagging, time-series telemetry and digital-twin discipline.
* Hands-on Grafana experience authoring dashboards against building-systems or industrial data.
* Track record on regulated environments — at least one of data centre, pharma, healthcare, defence or Crown Estate.
* Right to work in the UK and willingness to clear background checks for Crown Estate and regulated client sites as required.
*Highly desirable: *
* Azure Data Explorer / Kusto Query Language hands-on experience (or comparable time-series stack — InfluxDB, TimescaleDB).
* KNX Partner certification with active ETS6 licence.
* Schneider EcoXpert accreditation (Building Management, KNX or Power).
* SpaceLYnk and Wiser for KNX experience, including Lua scripting.
* Crestron control system experience (DM, NVX, programming in SIMPL/SIMPL# or C#).
* Specific MQTT broker experience — HiveMQ, EMQX, Mosquitto or AWS IoT Core at building or estate scale.
* Brick Schema hands-on implementation — class modelling, SPARQL/RDF, or equivalent ontologies (Haystack, RealEstateCore, ASHRAE 223P).
* Familiarity with Mapped, Willow, PassiveLogic, Dabbel or comparable independent data-layer platforms.
* GRMS delivery on recognised hospitality platforms (Schneider, Inncom, Honeywell INNCOM, iRidium, Lutron).
* Hotel PMS integration (Opera, Protel, Mews) and BACnet/IP-to-PMS middleware.
* DMX / theatrical lighting integration on hospitality or heritage projects.
* AI-assisted development workflows (Copilot, Claude Code) for accelerating commissioning documentation and logic generation.
* AutoCAD and/or EPLAN for electrical schematics and panel documentation.
* BSc/MSc in Electrical, Control, Software or Building Services Engineering.
*What we offer:*
* A senior seat on a varied pipeline — flagship hospitality, superprime residential, regulated digital-estate work, and the corporate critical-environment work where OKTO is extending into critical infrastructure.
* A genuine bridge between the field-engineering world and the platform-engineering world. You will not be siloed.
* Above-market day rate, benchmarked deliberately above the typical BMS/integrator contractor range — we recruit on quality, not on rate-card.
* Travel, accommodation and subsistence fully covered on site-based work.
* Direct access to OKTO's technical leadership — no agency layer between you and the engineering decisions.
* Scope for renewal and longer engagement as CIDE-OS scales and the pipeline grows.
* A small, technically serious team where the standard is quiet precision.
Pay: £700.00-£750.00 per day
Work authorisation:
* United Kingdom (required)
Work Location: On the road
  • London, England, United Kingdom

Compétences linguistiques

  • English
Avis aux utilisateurs

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