The log reads 07:58 on a wet Tuesday. A wallbox called CP-0412 opens a WebSocket to the central system and sends [2, "a91f", "BootNotification",{"chargePointVendor": "example-vendor", "chargePointModel": "example-model"}]. The CPMS responds with Accepted and a 300-second interval; the heartbeats start ticking, and everything looks calm. Forty minutes later, a driver taps an RFID card, the connector locks, and the charger sends StartTransaction with idTag 04A1B2C3. The backend replies with idTagInfo status Invalid. The cable is in, the car is waiting, and the driver is standing at the plug wondering why nothing is flowing. Somebody has to read that trace, work out whether the card, the charger, or the backend's authorization logic is at fault, and fix it before the next driver hits the same problem. Reading traces like that one is the heart of remote OCPP integration engineer jobs.
Think of this page as the OCPP integration engineer job description, told in the order a charger experiences things. The role is full-time and pays $95,000 USD per year, and as with most OCPP integration engineer jobs remote worldwide, location is up to you. Your main job is onboarding new charger models to the employer's CPMS and keeping them well-behaved once live.
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Before any OCPP message: the WebSocket handshake
Every session starts with an HTTP upgrade. The charger connects to a URL ending in its own identity, such as /ocpp/CP-0412, and asks for a subprotocol like ocpp1.6 or ocpp2.0.1. If the subprotocol header is missing or misspelled, the connection fails before a single OCPP message is exchanged, and that is a surprisingly common first-day bug with a new model. You will also check TLS settings, basic auth credentials, and what happens when a modem drops the link and the unit reconnects with stale queued messages.
OCPP-J frames are simple JSON arrays. A CALL starts with 2, a CALLRESULT with 3, a CALLERROR with 4, and the unique message ID ties request to response. Many puzzles come down to noticing whether a reply arrived late, twice, or not at all.
Boot, heartbeat and the configuration keys behind them
A typical onboarding begins here. The BootNotification tells you vendor, model, serial, and firmware version, and the central system's reply decides whether the charger is Accepted, Pending, or Rejected. After that comes mapping: which configuration keys the model supports, which values it ships with, and which need changing. On 1.6J, that means working through GetConfiguration output and setting keys such as HeartbeatInterval, MeterValueSampleInterval, ConnectionTimeOut, and LocalPreAuthorize with ChangeConfiguration. Vendors often add custom keys, and you document those so nobody has to guess later.
A typical day of charger onboarding to the CPMS: connect a sample unit or simulator, capture the boot, compare supported keys against the standard profile, and agree on fixes with the manufacturer.
Authorization, and the rejected start from the opening
Back to the driver. In 1.6J, a charger can send Authorize before starting, or it can start locally and send StartTransaction straight away, depending on keys like LocalPreAuthorize and LocalAuthorizeOffline and whether a local authorization list or cache is enabled. In this illustrative trace, the card had been blocked in the billing system an hour earlier, but the charger's cache still treated it as valid, so it started locally and then got Invalid back. You would decide whether to change cache settings, push a fresh local list with SendLocalList, or adjust how the backend handles that edge case, then test the fix against the same model.
Transactions and meter values
Once charging starts, the money depends on the numbers. Check that meterStart and meterStop are sensible, that MeterValues arrive at the configured interval, and that the measurands a charger reports, such as Energy.Active.Import.Register or Power.Active.Import, have the right units and contexts. A classic fault is a charger that resets its energy register after a mid-session reboot, turning a 14 kWh session into a negative number on an invoice. Spotting that and building a guard for it is part of the role.
Firmware updates and diagnostics
Chargers in the field need updates. You will trigger UpdateFirmware, then follow the FirmwareStatusNotification sequence through Downloading, Downloaded, Installing, and Installed, or catch it when it stalls at InstallationFailed. For troubleshooting, you request log files with GetDiagnostics on 1.6J or GetLog on 2.0.1, which range from tidy JSON to free-form text.
OCPP 1.6J vs 2.0.1: what changes in practice
You will work with both versions, so the differences matter day to day:
- Transactions: 2.0.1 replaces StartTransaction, StopTransaction, and MeterValues during a session with a single TransactionEvent message carrying Started, Updated, and Ended events.
- Configuration: the flat key list of 1.6J gives way to a device model of components and variables, read with GetVariables and changed with SetVariables.
- Security: 2.0.1 defines security profiles covering everything from basic authentication up to TLS with client certificates, plus signed firmware.
- Authorization: idTag becomes idToken with types, and ISO 15118 Plug and Charge enters the picture.
The skills an integration engineer needs for 1.6J vs 2.0.1 overlap heavily, but 2.0.1 requires more patience with certificates and reading a much larger specification.
Debugging in Wireshark and Python, plus field support
Your daily tools for this work are WebSocket, JSON, Python, and Wireshark. In Wireshark you filter on WebSocket, follow the TCP stream, and, for TLS traffic in a lab, load a key log file so frames become readable. In Python, you write small scripts that replay a captured session, pull every CALLERROR out of a day's logs, or run a charger simulator through boot, authorize, charge, and stop on a loop. Most new model testing begins with simulator setup.
Field testing is remote for you. When a commissioning technician is on site, you watch the live connection, read the WebSocket log as they work, and tell them which setting to change.
Backend years plus OCPP depth: remote OCPP integration engineer jobs
Formally, you need a degree in electrical, computer, or software engineering, or equivalent experience, plus at least three years in backend development or EV charging integration. Hands-on knowledge of OCPP 1.6J and 2.0.1 is expected. Coming from backend work with no EV experience? Be ready to show that you have run a simulator and debugged real message flows. Because three years is the minimum, this won't suit people browsing entry-level remote OCPP integration engineer jobs or OCPP integration engineer jobs with no experience listings, though a strong backend developer who taught themselves OCPP is welcome. The core OCPP integration engineer skills are protocol reading, Python scripting, and working with patient logs.
People sometimes ask how this compares with an EV charging firmware engineer. Firmware engineers write the code inside the charger, in C or C++, close to the hardware. You sit on the other side of the WebSocket, making the backend and the charger agree.
OCA certification and CharIN training, honestly
The Open Charge Alliance runs certification testing for OCPP implementations, and CharIN offers OCPP training. Neither is required here. Exposure to OCA certification test sessions or CharIN OCPP training counts as a plus, because it shows you have seen how conformance is judged. If you are wondering about an OCPP integration engineer course, the best preparation is still the free specification documents, a simulator, and a few weeks of reading real logs. If you are still working out how to become an OCPP integration engineer, building a toy central system in Python teaches a lot. Treat any OCPP integration engineer certification as a bonus, not the goal.
The $95,000 figure and where you can work from
The OCPP integration engineer salary for this role is $95,000 USD per year, full-time. It is remote and open worldwide, so you work from home or wherever you have a reliable connection and can join calls with field teams.
Resume lines and the trace walkthrough
For your OCPP integration engineer resume, name the chargers or protocols you have integrated, the OCPP versions involved, and one concrete fault you traced and fixed. For OCPP integration engineer interview questions, you will likely talk through a captured trace, explain the difference between CALLRESULT and CALLERROR, and talk about how you would onboard an unfamiliar model.
Like other OCPP integration engineer work-from-home jobs on Naukri Mitra, this one is open and free to apply for; if they ask for payment at any stage, it is not a real hiring team. Send your CV through this page, and mention one trace you have debugged.
