ML Engineer
Kiefer
ML Engineer
Kiefer
EPC contractor delivering renewable energy projects
About the company:
KIEFER is building Greece's integrated AI ecosystem. From renewable energy infrastructure and AI systems to robotics and enterprise applications, we connect the technologies that power Europe's intelligent future. Founded in 2014, KIEFER has delivered 600MW+ of energy projects and is now developing sovereign AI infrastructure, enterprise AI products and physical AI systems for Greece and Southeast Europe.
About the role
We are looking for an ML Engineer to improve automatic speech recognition (ASR) for Sophea Meet. You will work with real meeting audio and own the improvement loop from data and model experiments through evaluation and production performance.
The initial language focus is English. Additional languages, starting with Greek, will be prioritized with Product based on usage and product needs.
What you will do
Train, fine-tune, adapt, and evaluate speech recognition models based on measured product needs.
Build representative benchmarks and regression tests for real meeting audio.
Prepare speech datasets and investigate difficult cases, including noise, overlapping speakers, long sessions, and specialized terminology.
Use error analysis to decide which model, data, or pipeline changes will improve transcription quality.
Improve inference across accuracy, latency, throughput, reliability, and cost.
Deploy and monitor model versions with Engineering, while working with Product to set quality goals and prioritize improvements.
What you will need
3+ years of relevant ML or research engineering experience, with clear technical ownership and measurable results.
Strong hands-on ASR or speech ML experience, including a speech recognition system you shipped or materially improved.
Experience training, fine-tuning, or adapting deep learning models using real-world audio data.
Strong evaluation skills, including WER/CER, benchmark design, error analysis, and regression testing.
Strong Python, hands-on experience with PyTorch, JAX, TensorFlow, or a similar framework, and solid software engineering skills.
Experience deploying, monitoring, and maintaining production ML systems.
Nice to have
Multilingual ASR, accent robustness, domain adaptation, or diarization.
Streaming speech recognition and low-latency inference.
MLOps, evaluation, or data pipelines for speech systems.
Experience with meeting transcription, voice agents, or enterprise speech products.
What is there for you
Compensation: Competitive package aligned with talent benchmarks.
Impact: Hands-on work shaping AI capabilities for Kiefer Tech’s products and real-world applications.
AI-native environment: Real challenges across model development, evaluation, and production AI systems.
Culture: Engineering-first, high autonomy, low bureaucracy, and space to shape meaningful AI products.
kIEFER TEK LTD is a Greek EPC contractor in the renewable energy sector, delivering end-to-end solutions for energy systems. It develops, designs, supplies, constructs, and maintains photovoltaic, wind, small hydro, and biogas projects, as well as energy storage stations. The company manages the full project lifecycle from development to operation, using a turnkey approach that combines low initial costs with long plant life and ongoing monitoring and maintenance to optimize performance. It differentiates itself through its comprehensive lifecycle service, competitive pricing, and a growing footprint in Southeast Europe (Cyprus, Bulgaria, Romania) with ISO 9001:2015 quality certification and a 200 MW operating license. Its goal is to build long-term client relationships by delivering high-quality, cost-efficient projects while expanding capacity and storage across Greece and the region, aiming for about 1 GW of storage and securing 1 GW of additional renewables capacity in 2021–2024.
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