Senior Software Engineer (with Architecture Growth Path) – Railway Signaling Systems On-Board

BOSS Revolution helps millions of people across the world stay connected with family and friends — through international calling, mobile top-up, and money services. As a Senior Flutter Developer on our DTC Calling team, you'll build and evolve the flagship BOSS Revolution app: a large-scale Flutter product with a deep native calling stack (SIP/VoIP on Android and iOS) at its core.

You'll work in one of the largest Flutter codebases in production — a monorepo of 100+ internal packages, feature-first clean architecture, and a strong engineering culture around code quality, testing, and automation.

What You'll Do:

• Hybrid development: Design and build high-performance features in Flutter/Dart, while maintaining and extending the native calling stack — SIP clients, audio handling, CallKit/ConnectionService integration — in Kotlin and Swift, connected via platform channels
• Own features end-to-end within our feature-first clean architecture: Bloc/Cubit state management, repositories, immutable state, and 90%+ unit-test coverage on business logic
• Work at real scale: a melos-managed monorepo with 100+ packages, strict dependency hierarchy, code generation (freezed / json_serializable), and shared design system
• Ensure reliability of a real-time product: monitor releases with Crashlytics and analytics pipelines, investigate call-quality and stability issues, and drive performance optimization
• Contribute to the overall architecture and technical strategy of our mobile platform — from package design to migration of legacy patterns to the current architecture
• Collaborate closely with product managers, backend engineers, QA, and designers as part of a cross-functional product team
• Improve our engineering toolchain: GitHub Actions CI/CD, automated store/TestFlight releases, diff-coverage gates, and code-quality automation

We're Looking For:

• 5+ years of experience building large-scale mobile apps, including 3+ years with Flutter
• Strong proficiency in Flutter/Dart with deep understanding of the ecosystem: Bloc/Cubit (or comparable state management), asynchronous programming and isolates, code generation, and dependency injection
• Hands-on experience with native mobile development (Kotlin/Android and/or Swift/iOS) and integrating native code with Flutter via platform channels
• Solid understanding of mobile architecture patterns (clean architecture, modularization), performance optimization, and security best practices
• Strong testing culture: unit and bloc testing with mocked collaborators, deterministic tests, working under coverage gates
• Experience with the full mobile app development lifecycle — from concept to production and post-release monitoring — including Git, CI/CD pipelines (e.g., GitHub Actions), code signing, and deployment automation to the App Store and Google Play
• English: Upper-Intermediate or higher

It Would Be a Plus:

• Experience with VoIP/real-time communication: SIP, WebRTC, CallKit / Telecom framework, push-triggered call handling, audio session management
• Experience working in large monorepos (melos, Mason, or similar tooling)
• Knowledge and experience beyond the mobile stack (backend, infrastructure, observability)
• Domain experience in telecom, fintech, or other regulated consumer products

We are pleased to offer you:

• Remote b2b (Georgia-Moldova) or on-site employment (Belarus-Moldova) work opportunity!
• Stable job with long-term growth perspective
• Competitive salary with annual performance review
• Really good hardware
• An exciting and challenging job with talented people around
• Continuous learning and career growth opportunities
• Compensation for professional training, seminars, and conferences
• Referral program - get rewarded for helping us grow the team with talented people
• Company-supported English classes to enhance your professional growth
• More perks for the Minsk and Chisinau office employees

A few words about us:
IDT Corporation is a global communications company founded in 1990 and headquartered in Newark, New Jersey. We are industry leaders in prepaid communication and payment services and one of the largest international voice carriers. We are listed on the NYSE, employ over 1800 people across 20 countries, and have over $1.5 billion in revenues.

IDT is not ”another big IT corporation”— we encourage and support in-house entrepreneurs in developing their ideas into business actions.

Our flagship brand, BOSS Revolution, offers Money Transfer, International Calling, and Mobile Top-Up services and supports IDT’s mission of enabling people to keep in touch and share resources with family and friends worldwide.

If you're looking for a company that will give you the maximum flexibility in choosing a location to work, this opportunity is for you!

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

BOSS Revolution helps millions of people across the world stay connected with family and friends — through international calling, mobile top-up, and money services. As a Senior Flutter Developer on our DTC Calling team, you'll build and evolve the flagship BOSS Revolution app: a large-scale Flutter product with a deep native calling stack (SIP/VoIP on Android and iOS) at its core.

You'll work in one of the largest Flutter codebases in production — a monorepo of 100+ internal packages, feature-first clean architecture, and a strong engineering culture around code quality, testing, and automation.

What You'll Do:

• Hybrid development: Design and build high-performance features in Flutter/Dart, while maintaining and extending the native calling stack — SIP clients, audio handling, CallKit/ConnectionService integration — in Kotlin and Swift, connected via platform channels
• Own features end-to-end within our feature-first clean architecture: Bloc/Cubit state management, repositories, immutable state, and 90%+ unit-test coverage on business logic
• Work at real scale: a melos-managed monorepo with 100+ packages, strict dependency hierarchy, code generation (freezed / json_serializable), and shared design system
• Ensure reliability of a real-time product: monitor releases with Crashlytics and analytics pipelines, investigate call-quality and stability issues, and drive performance optimization
• Contribute to the overall architecture and technical strategy of our mobile platform — from package design to migration of legacy patterns to the current architecture
• Collaborate closely with product managers, backend engineers, QA, and designers as part of a cross-functional product team
• Improve our engineering toolchain: GitHub Actions CI/CD, automated store/TestFlight releases, diff-coverage gates, and code-quality automation

We're Looking For:

• 5+ years of experience building large-scale mobile apps, including 3+ years with Flutter
• Strong proficiency in Flutter/Dart with deep understanding of the ecosystem: Bloc/Cubit (or comparable state management), asynchronous programming and isolates, code generation, and dependency injection
• Hands-on experience with native mobile development (Kotlin/Android and/or Swift/iOS) and integrating native code with Flutter via platform channels
• Solid understanding of mobile architecture patterns (clean architecture, modularization), performance optimization, and security best practices
• Strong testing culture: unit and bloc testing with mocked collaborators, deterministic tests, working under coverage gates
• Experience with the full mobile app development lifecycle — from concept to production and post-release monitoring — including Git, CI/CD pipelines (e.g., GitHub Actions), code signing, and deployment automation to the App Store and Google Play
• English: Upper-Intermediate or higher

It Would Be a Plus:

• Experience with VoIP/real-time communication: SIP, WebRTC, CallKit / Telecom framework, push-triggered call handling, audio session management
• Experience working in large monorepos (melos, Mason, or similar tooling)
• Knowledge and experience beyond the mobile stack (backend, infrastructure, observability)
• Domain experience in telecom, fintech, or other regulated consumer products

We are pleased to offer you:

• Remote b2b (Georgia-Moldova) or on-site employment (Belarus-Moldova) work opportunity!
• Stable job with long-term growth perspective
• Competitive salary with annual performance review
• Really good hardware
• An exciting and challenging job with talented people around
• Continuous learning and career growth opportunities
• Compensation for professional training, seminars, and conferences
• Referral program - get rewarded for helping us grow the team with talented people
• Company-supported English classes to enhance your professional growth
• More perks for the Minsk and Chisinau office employees

A few words about us:
IDT Corporation is a global communications company founded in 1990 and headquartered in Newark, New Jersey. We are industry leaders in prepaid communication and payment services and one of the largest international voice carriers. We are listed on the NYSE, employ over 1800 people across 20 countries, and have over $1.5 billion in revenues.

IDT is not ”another big IT corporation”— we encourage and support in-house entrepreneurs in developing their ideas into business actions.

Our flagship brand, BOSS Revolution, offers Money Transfer, International Calling, and Mobile Top-Up services and supports IDT’s mission of enabling people to keep in touch and share resources with family and friends worldwide.

If you're looking for a company that will give you the maximum flexibility in choosing a location to work, this opportunity is for you!

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

About Mira
Mira is a San Francisco-based hormonal health company providing integrative care and hormonal testing for over 300,000 customers. In 2023, we were recognized by Inc. 5000 as America's fastest-growing femtech company.

Mira’s breakthrough innovation was creating the market’s only FDA-compliant at-home hormone monitor with quantitative testing technology. From the beginning, our mission has been to make hormone data accessible and meaningful - so women can understand their bodies and make confident health decisions at every stage of life, from cycle health and family planning to hormonal imbalances and the menopause transition.

We are committed to improving real health outcomes through personalized insights, cutting-edge technology, and science-backed data—turning hormone information into practical guidance for everyday wellbeing.

About The Position
We are looking for a
Growth Marketing Manager
to help scale existing acquisition channels, test new growth opportunities, and lead international market expansion.

This role is for a well-rounded, hands-on growth marketer who can own strategy and execution. The ideal candidate is analytical, independent, strong in measurement, comfortable working with creative and influencer teams, and able to use AI tools to move faster.

The main focus will be on improving
NCROAS, CAC, and incremental growth
across priority channels and markets.

Requirements

• 4+ years of experience in DTC e-commerce growth marketing, paid acquisition, performance marketing, or international growth at a company with $10M+ ARR, preferably in the US or Canada market.
• Strong hands-on experience optimizing paid acquisition channels such as Google Ads, TikTok Ads, Meta Ads, YouTube, Influencers, or other scalable performance channels.
• Proven ability to improve existing channels and unlock new growth channels, not just manage current performance.
• Strong understanding of growth metrics such as CAC, NCROAS, ROAS, MER, LTV, conversion rate, AOV, and payback period.
• Strong analytical skills with the ability to build reports, analyze performance, and make decisions using tools like Looker, GA4, Triple Whale, Shopify, Google Sheets**, or similar platforms**.
• Strong understanding of tracking, attribution, conversion events, incrementality, and the limitations of platform-reported performance.
• Independent, hands-on operator who can prioritize what matters, move fast, work with creative/influencer teams, and use AI tools like Claude or ChatGPT to improve marketing workflows.

Details
The role is a remote position, with a 40-hour workweek, flexible working hours, and occasional overlap with the US team.

Responsibilities

• Own and optimize priority paid acquisition channels with a focus on improving NCROAS, CAC, and incremental growth.
• Identify the biggest growth opportunities across existing channels and build clear action plans to improve performance.
• Build and execute growth strategies for international markets, including channel mix, budget allocation, creative strategy, offer strategy, funnel improvements, and measurement.
• Identify, prioritize, and test new growth channels beyond existing paid media, including influencer marketing, YouTube, CTV, Reddit, affiliates, partnerships, and other scalable acquisition channels.
• Build clear validation frameworks for major tests, including hypothesis, budget, timeline, measurement plan, and pass/fail criteria.
• Work closely with creative, analytics, and agency partners to turn performance insights into better creatives, landing pages, campaigns, and channel-level growth decisions.

Step 1: ‘Screening call with HR’ - Step 2: ‘Interview with department lead’ Step 3: ‘Assessment task’ - Step 4: ‘Final interview with CMO and Head of Growth’

Benefits

• Join one of the fastest-growing femtech companies in the U.S., driven by a strong mission to advance women’s health and expand access to care
• Be part of a passionate, highly motivated, and international team dedicated to making a real difference in people’s lives
• Thrive in a fast-paced startup environment where your work directly impacts company growth, strategy, and key decisions
• Enjoy real opportunities for career growth, with the ability to shape, build, and develop teams as we scale
• Work in a flexible, fully remote environment that supports autonomy, ownership, and independence
• Receive a competitive salary along with a performance-based bonus system tied to OKRs

A Snapshot of Your Day
Your day begins by reviewing new feature requirements and updating automated test scripts to reflect the latest changes. You sync with software developers to clarify technical details and ensure test coverage for critical modules. Before lunch, you execute automated test suites, analyze results, and report defects using Solution Manager or equivalent tools. In the afternoon, you participate in sprint planning, refine test data management strategies, and contribute to functional and quality reviews. You close the day by optimizing test automation frameworks and sharing insights with the team to drive continuous improvement.

Only applicable when hiring in Croatia:
Located in Split, Zagreb or Osijek (Croatia), you will be a part of the team of Pro Integris d.o.o. who is the 100% Siemens Energy subsidiary/legal entity.

How You’ll Make An Impact

• Develop, maintain, and execute automated test scripts for substation automation software, covering key functional and non-functional requirements.
• Partner with functional teams to define test scenarios, prepare test data, and document detailed execution steps.
• Integrate automation into CI/CD pipelines and support on-demand test cycles for rapid validation.
• Monitor and report script development/execution status in Solution Manager and related tools; present results to stakeholders (including live demos).
• Analyze failures, log defects, coordinate resolution with development teams, and manage retesting to closure.
• Evolve automation capability by improving frameworks (e.g., TOSCA/Worksoft), supporting tool setup/configuration/licensing, contributing to automation standards/handbooks, and mentoring team members.

What You Bring

• Long-term hands-on experience in test automation for industrial or grid automation software projects.
• Strong proficiency with automation tools/frameworks (TOSCA, Worksoft, or similar), scripting, and CI/CD integration.
• Domain understanding of substation automation and grid technologies; protocols such as IEC 61850, IEC 104, and DNP3 are a strong plus.
• Excellent communication and stakeholder management skills; proven ability to coordinate across automation, development, and functional teams.
• Experience with test dashboards/reporting and data-driven optimization of coverage and efficiency.
• Familiarity with agile delivery and structured governance (e.g., sprint rituals, quality reviews, PLM stage-gates); fluent English (German a plus).

About The Team
Our Grid Technologies division enables a reliable, sustainable, and digital grid. The power grid is the backbone of the energy transition. Siemens Energy offers a leading portfolio and solutions in HVDC transmission, grid stabilization and storage, high voltage switchgears and transformers, and digital grid technology.

Who is Siemens Energy?
At Siemens Energy, we are more than just an energy technology company. We meet the growing energy demand across 90+ countries while ensuring our climate is protected. With ~100,000 dedicated employees, we not only generate electricity for over 16% of the global community, but we’re also using our technology to help protect people and the environment.

Our global team is committed to making sustainable, reliable, and affordable energy a reality by pushing the boundaries of what is possible. We uphold a 150-year legacy of innovation that encourages our search for people who will support our focus on decarbonization, new technologies, and energy transformation.

Find out how you can make a difference at Siemens Energy: https://www.siemens\-energy.com/employeevideo

Our Commitment to Diversity
Lucky for us, we are not all the same. Through diversity, we generate power. We run on inclusion and our combined creative energy is fueled by over 130 nationalities. Siemens Energy celebrates character – no matter what ethnic background, gender, age, religion, identity, or disability. We energize society, all of society, and we do not discriminate based on our differences.

Rewards/Benefits

• The opportunity to engage in an exciting environment on meaningful projects
• Opportunities for career growth within a supportive workplace culture
• International environment, along with a pension fund
• Enjoy flexible working hours and the option to work from home
• Access to a canteen or meal allowances
• And more!

https://jobs.siemens\-energy.com/jobs