Available Vacancies
Production Operator
Effective Date: September 2026
Department: Operations
Office: Letchworth – Hertfordshire
We are recruiting for multiple Production Operator positions.
Company Overview
On-systems designs and manufactures rugged, reliable power systems for harsh environments, predominantly aerospace, defence and marine. We are fair and customer focused, and we integrate closely with our partners’ engineering teams. Our colleagues work with a can-do attitude. Three words drive the business: Understand, Develop and Deliver.
We are a growing company with a strong order book and real opportunities for personal development. Products include custom and Mil-COTS AC-DC and DC-DC converters, UPS and battery management systems, inverters and integrated platform power solutions, built at our Letchworth site.
Role Summary
Working within Operations, you will build and assemble power conversion products so that they are delivered on time, within cost and to the required quality standard.
You will own the quality of your work, follow controlled work instructions and drawings, and move between electronic, wiring and mechanical tasks as the build plan requires. You will work as part of a small team and on your own initiative, contribute to improvement projects, and keep a strong awareness of health and safety, ESD and foreign-object control.
Key Duties and Responsibilities
Electronic assembly
- Build printed circuit assemblies and sub-assemblies from work instructions, BOMs, assembly drawings and the traveller or job card.
- Fit through-hole components, hardware, connectors, heatsinks and mechanical parts to boards, using the specified orientation, polarity and torque.
- Prepare boards for later process steps: forming leads, cleaning, masking, conformal coat support and visual inspection of your own work.
- Surface-mount assembly is useful but not essential. Where trained, place or rework SMT parts under instruction and inspect to the company standard.
Soldering
- Hand-solder electronic assemblies to IPC J-STD-001 (or the company equivalent), including through-hole joints, wires to pins, and connector terminations.
- Select the correct iron, tip, solder and flux for the joint. Avoid damage to pads, tracks, insulation and heat-sensitive parts.
- Inspect joints for wetting, holes, bridges, icicles and disturbed solder. Correct defects before the unit leaves your bench.
- Use ESD-safe tools and maintain a clean, controlled soldering station, including tip care and solder-waste disposal.
Cable, wiring and harness assembly
- Cut, strip, tin, crimp and terminate wires and cables to the drawing, including heat-shrink, labels, lacing or ties as specified.
- Build looms and internal wiring for power products: route cables, dress to drawings, fit backshells and strain relief, and avoid pinch or abrasion points.
- Check crimp quality, pull-off where required, and continuity or isolation before the assembly is closed up.
- Identify wires and connectors correctly so that later test and integration is not delayed by wiring errors.
Mechanical assembly
- Assemble chassis, lids, front panels, fans, brackets, battery hardware and other mechanical parts using the specified fasteners, threadlocker and torque values.
- Fit assembled boards and looms into enclosures without damaging components, wiring or finishes.
- Apply labels, serial plates, gasket or sealing features and final cosmetic checks so the unit is ready for test or despatch.
- Use hand tools, torque tools and basic workshop equipment correctly and report anything that is damaged or out of calibration.
Materials, workplace and flow
- Kit, count and look after parts for your job. Raise shortages, damaged parts or drawing errors rather than substituting without approval.
- Support goods-in, stores and despatch as required: identify parts, pack finished units, and keep paperwork with the product.
- Keep benches, tools and storage in a 5S, ESD-controlled and FOD-aware condition.
- Have a working appreciation of materials processing, calibration of production tools and basic equipment care.
Quality, records and safety
- Follow work instructions exactly. Do not work around missing steps, unclear drawings or expired materials.
- Inspect your own work at each stage. Record build data, serial numbers and any deviation on the job card or quality record.
- Raise non-conformances for defects, process escapes or unsafe conditions. Support containment and rework when asked.
- Work safely with soldering equipment, solvents, batteries, stored energy and mechanical tools. Stop and escalate if a job is unsafe.
Improvements
- Suggest practical improvements to fixtures, work instructions, kit layout and build sequence to reduce errors and wasted time.
- Take part in company improvement projects and share methods so that builds stay consistent between operators.
- Be willing to learn adjacent skills (further assembly processes, basic test support or stores) as the business needs.
Qualifications and Skills
Essential
- GCSE Maths and English, or equivalent.
- Computer literate, including accurate data entry and use of standard Windows applications.
- Able to follow detailed work instructions, drawings and BOMs.
- Able to work as part of a small team and unsupervised once trained.
- Good timekeeping, careful manual work and a desire to learn.
- IPC J-STD-001 qualified, or willing to train to that standard. Training will be provided.
Desirable
- Proven electronic, cable or mechanical assembly experience in a controlled production environment.
- Surface-mount assembly or rework experience.
- Familiarity with IPC-A-610 / IPC/WHMA-A-620 acceptance standards.
- Experience of ESD control, torque-controlled assembly, or working to ISO 9001 / AS9100.
- Previous work on power supplies, industrial electronics or similar hardware.
Full training will be provided. There are opportunities to progress through the company and to gain an appreciation of other areas of the business. Higher-level qualifications can be supported through day release or other agreed arrangements.
Work Environment
Production shop floor, warehouse and office areas at the Letchworth site. The role is hands-on at the bench, with movement between assembly, stores and packing as products move through build.
On-systems employee core values
- Team player, sharing in the greater good of the company.
- A positive colleague with a can-do attitude.
- Fair, helpful, respectful and approachable.
- Professional, with honesty and integrity.
- Proactive and organised, with a focus on the customer.
- Process driven, with clear and reliable communication.
- Committed to self-improvement.
What We Offer You
- Company pension scheme with up to 5% employer contribution.
- Employee Assistance Programme and healthcare.
- 25 days’ holiday (extending to unlimited, subject to approval), plus public holidays.
- Cycle to work scheme.
- A supportive and friendly working environment with a focus on wellbeing.
Other Information
Interviews will be held on site.
This role is not currently subject to baseline security checks. The successful candidate must be prepared to undergo such checks in line with business needs.
Equality and Inclusion
On-systems is committed to equality of opportunity for all and takes positive steps to remain an inclusive business. We will welcome and support you from your initial application to wherever your career takes you. Please get in touch if you would like to discuss any reasonable adjustments to your application so that we can accommodate and support you in the process. If you want to work for a company where who you are is valued and respected, we would love to hear from you.
Test Technician
Effective Date: September 2026
Department: Production
Office: Letchworth – Hertfordshire
Company Overview
On-systems designs and manufactures rugged, reliable power systems for harsh environments, predominantly aerospace, defence and marine. We are fair and customer focused, and we integrate closely with our partners’ engineering teams. Our colleagues work with a can-do attitude. Three words drive the business: Understand, Develop and Deliver.
We are a growing company with a strong order book and real opportunities for personal development. It is an exciting time to join us.
On-systems Ltd was established in 2010 and is based in Letchworth, Hertfordshire. The team remains compact, but it is growing in line with our plans. Products include custom and Mil-COTS AC-DC and DC-DC converters, UPS and battery management systems, inverters and integrated platform power solutions.
Role Summary
Working across Production and Engineering, you will test, diagnose and release power conversion products so that they ship on time, within cost and to the required quality standard.
You will own the quality of your work, follow controlled test methods, investigate failures using schematics and measurement, keep company test equipment in calibration, and feed practical improvements back into fixtures, procedures and design. You will work as part of a small team and on your own initiative, with a strong awareness of health and safety.
Key Duties and Responsibilities
Production and product test
- Carry out PCB-level and system-level testing of DC-DC and AC-DC converters, UPS, battery management products, inverters and integrated power systems, in line with approved test procedures and acceptance test plans.
- Set up and operate test equipment including programmable power supplies, electronic loads, multimeters, oscilloscopes, current probes, power analysers and product-specific test jigs.
- Load firmware or configuration where required, apply specified test limits, and record results with full product traceability.
- Prepare units for test, including visual inspection, correct fixturing, connector and harness checks, and safe application of high voltage or high current where authorised.
- Release conforming product, or raise non-conformance records for failures, incomplete tests or missing documentation.
Diagnostics and fault finding
- Diagnose first-time and recurring failures at board and system level, isolating the fault to a circuit function, component, assembly, software or test-setup issue.
- Use schematics, BOMs, wiring diagrams, PCB layouts and work instructions to plan measurements and confirm expected voltages, waveforms, timing and protection behaviour.
- Distinguish manufacturing defects, handling damage, test-equipment problems and genuine design or documentation issues, and escalate design-related findings to Engineering.
- Support rework and repair by marking up failed locations, confirming the repair, and retesting to the original procedure.
- Capture clear fault descriptions, measurements and photographs so that Engineering, Quality and suppliers can act on the evidence.
Schematic investigation and technical feedback
- Read analogue and power electronics schematics well enough to follow signal and power paths, identify sense points and understand protection, start-up and feedback circuits.
- Investigate mismatches between schematic, BOM, layout, harness drawing and the hardware in front of you, and raise drawing or build queries rather than working around them silently.
- Review test coverage against the design intent and highlight gaps, ambiguous limits or steps that do not catch known failure modes.
- Maintain accurate test records, serial-number history and equipment used, so results remain auditable.
Improvements
- Propose and help implement improvements to test methods, fixtures, wiring, work instructions and data capture to improve first-time yield, cycle time and repeatability.
- Contribute to company improvement projects, including 5S on the test bench, error-proofing of setups and reduction of recurring faults.
- Feed practical production-test experience into Engineering during design reviews, prototype bring-up and procedure updates.
- Share knowledge with colleagues so test methods stay consistent when more than one technician is on the same product.
Calibration, equipment and workplace
- Take ownership of calibration for company-owned test equipment: track due dates, remove out-of-calibration items from use, and arrange external or internal calibration.
- Perform daily or pre-use checks on key instruments and report damaged, drifting or suspect equipment immediately.
- Keep test benches, fixtures and storage in a safe, ESD-controlled and audit-ready condition.
- Maintain a working appreciation of goods-in, materials handling, despatch and basic equipment care so test is not isolated from the rest of Production.
Design verification support
- Assist Engineering with design verification testing, prototype bring-up, margin checks and characterisation as required.
- Support preparation of units for environmental, EMC or customer witness testing, following the written plan.
- Record unexpected behaviour during DVT with the same discipline used in production test.
Quality, health and safety
- Follow work instructions, quality procedures and ESD controls. Own the quality of every unit you test.
- Work safely around live power electronics, stored energy in capacitors and batteries, and rotating or mechanical assemblies.
- Stop work and escalate if a procedure, fixture or product is unsafe or if results cannot be trusted.
Qualifications and Skills
Essential
- GCSE Maths and English, or equivalent.
- Computer literate, including accurate data entry and use of standard Windows applications.
- Able to follow detailed work instructions and complete records without being prompted.
- Able to work as part of a small team and unsupervised once trained.
- Good timekeeping, a desire to learn, and a practical, methodical approach to measurement.
Desirable
- Ability to read electronic schematics and interpret basic analogue or power-circuit behaviour.
- Hands-on experience with multimeters, oscilloscopes and programmable loads or power supplies.
- Previous test, diagnostics or production experience on power electronics, power supplies, batteries or similar hardware.
- Electronic assembly, soldering (IPC or equivalent), surface-mount rework, cable and wiring assembly, or mechanical assembly.
- Familiarity with controlled quality systems (for example ISO 9001 or AS9100) and non-conformance processes.
Full training will be provided. There are opportunities to progress through the company and to gain an appreciation of other areas of the business. Higher-level qualifications can be supported through day release or other agreed arrangements.
Work Environment
Shop floor, warehouse and office areas at the Letchworth site. The role is hands-on at the test bench, with time in stores and with Engineering as products move through build, test and verification.
What We Offer You
- Company pension scheme with up to 5% employer contribution.
- Employee Assistance Programme and healthcare.
- 25 days’ holiday (extending to unlimited, subject to approval), plus public holidays.
- Cycle to work scheme.
- A supportive and friendly working environment with a focus on wellbeing.
Other Information
Interviews will be held on site.
This role is not currently subject to baseline security checks. The successful candidate must be prepared to undergo such checks in line with business needs.
Equality and Inclusion
On-systems is committed to equality of opportunity for all and takes positive steps to remain an inclusive business. We will welcome and support you from your initial application to wherever your career takes you. Please get in touch if you would like to discuss any reasonable adjustments to your application so that we can accommodate and support you in the process. If you want to work for a company where who you are is valued and respected, we would love to hear from you.
Reasons to work for On-systems
We offer 25 days holiday every year plus 8 bank holidays, giving you plenty of time to recharge. If you want extra days off, you can request them with your line manager’s permission. To make your birthday even better, we give you an additional day off to celebrate, on us!
Planning for the future is important. That’s why we contribute 5% to your pension while you contribute 3%. It’s a straightforward way to help boost your savings over time without you having to think too much about it.
We believe in giving back. When agreed with your manager, you’re encouraged to take volunteer days to support causes close to your heart or help out in your local community. It’s a great chance to make a positive impact outside of work.
Every year we carry out pay reviews and link bonuses to both how well the business performs and your personal development. Annual appraisals give you a chance to discuss your progress, set goals and ask for training opportunities to help you grow your skills and career.
When the company hits its targets, we’re keen to reward our team with a bonus. It’s our way of sharing success and recognising the hard work everyone puts in throughout the year.
We understand life can be busy, so we offer flexible hours. For office teams, core hours run from 8:30am to 3pm, and for production, it’s 8am to 4:30pm. Plus, everyone gets a half-day off on Fridays to start the weekend early and unwind.
With your line manager’s agreement, you can work from home occasionally. This offers a balance between office life and working remotely, so you can manage your time in a way that suits you best.
Your health matters to us. We provide private healthcare cover, which can be extended to your family if you’d like, giving peace of mind when it comes to medical care.
We invest in your future by funding courses that help you develop professionally and personally. Whether it’s building new skills or advancing current ones, we want to support your progress.
If you’re unwell, you’ll receive paid sick leave for up to two weeks each year. It’s important you take the time to recover fully without worrying about your income.
Every week, you can send a little treat in a mug to a colleague who’s gone above and beyond. It’s a simple but meaningful way to say thank you and celebrate everyday efforts.
Our monthly awards shine a spotlight on those who have really stood out. You’ll get to vote for your peers, and winners receive a gift of their choice as a token of appreciation.
We believe working together should be fun. Departments hold offsite meetings with lunches, and we organise social events like escape rooms or go-karting to help build strong team bonds outside the office.
To keep you fuelled, we provide free coffee and tea daily. Plus, parking is free on-site, saving you time and hassle when you come to work.